--- firefox-52.9.0esr/python/mozbuild/dumbmake/dumbmake.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/dumbmake/dumbmake.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 from collections import OrderedDict
 from itertools import groupby
@@ -36,7 +36,7 @@
     deps = {}
 
     for i, (indent, target) in enumerate(pairs):
-        if not deps.has_key(target):
+        if target not in deps:
             deps[target] = []
 
         for j in range(i+1, len(pairs)):
@@ -68,7 +68,7 @@
                     del all_targets[dependency]
                 all_targets[dependency] = True
 
-    return all_targets.keys()
+    return list(all_targets.keys())
 
 def get_components(path):
     """Take a path and return all the components of the path."""
@@ -114,7 +114,7 @@
                 make_dirs[make_dir] = True
 
     all_components = []
-    for make_dir in make_dirs.iterkeys():
+    for make_dir in make_dirs.keys():
         all_components.extend(get_components(make_dir))
 
     for i in all_dependencies(*all_components, dependency_map=dependency_map):
--- firefox-52.9.0esr/python/mozbuild/dumbmake/test/test_dumbmake.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/dumbmake/test/test_dumbmake.py	(refactored)
@@ -1,7 +1,7 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this file,
 # You can obtain one at http://mozilla.org/MPL/2.0/.
-from __future__ import unicode_literals
+
 
 import unittest
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/android_version_code.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/android_version_code.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function
+
 
 import argparse
 import math
--- firefox-52.9.0esr/python/mozbuild/mozbuild/artifacts.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/artifacts.py	(refactored)
@@ -40,7 +40,7 @@
 '''
 
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import collections
 import functools
@@ -57,7 +57,7 @@
 import subprocess
 import tarfile
 import tempfile
-import urlparse
+import urllib.parse
 import zipfile
 
 import pylru
@@ -183,7 +183,7 @@
 
         with JarWriter(file=processed_filename, optimize=False, compress_level=5) as writer:
             reader = JarReader(filename)
-            for filename, entry in reader.entries.iteritems():
+            for filename, entry in reader.entries.items():
                 for pattern, (src_prefix, dest_prefix) in self.test_artifact_patterns:
                     if not mozpath.match(filename, pattern):
                         continue
@@ -552,7 +552,7 @@
 
     def print_cache(self):
         with self:
-            for item in self._cache.items():
+            for item in list(self._cache.items()):
                 self.log(logging.INFO, 'artifact',
                     {'item': item},
                     '{item}')
@@ -565,7 +565,7 @@
         # We use the persisted LRU caches to our advantage.  The first item is
         # most recent.
         with self:
-            item = next(self._cache.items(), None)
+            item = next(list(self._cache.items()), None)
             if item is not None:
                 (name, args, sorted_kwargs), result = item
                 self.print_last_item(args, sorted_kwargs, result)
@@ -593,10 +593,10 @@
                          'changeset={changeset}&version=2&tipsonly=1')
         req = requests.get(cset_url_tmpl.format(tree=tree, changeset=revision),
                            headers={'Accept': 'application/json'})
-        if req.status_code not in range(200, 300):
+        if req.status_code not in list(range(200, 300)):
             raise ValueError
         result = req.json()
-        [found_pushid] = result['pushes'].keys()
+        [found_pushid] = list(result['pushes'].keys())
         return int(found_pushid)
 
     @cachedmethod(operator.attrgetter('_cache'))
@@ -609,7 +609,7 @@
                            headers={'Accept': 'application/json'})
         result = req.json()
         return [
-            p['changesets'][-1] for p in result['pushes'].values()
+            p['changesets'][-1] for p in list(result['pushes'].values())
         ]
 
 class TaskCache(CacheManager):
@@ -847,7 +847,7 @@
 
             candidate_pushheads = collections.defaultdict(list)
 
-            for tree, pushid in found_pushids.iteritems():
+            for tree, pushid in found_pushids.items():
                 end = pushid
                 start = pushid - NUM_PUSHHEADS_TO_QUERY_PER_PARENT
 
@@ -1052,7 +1052,7 @@
         """
         if source and os.path.isfile(source):
             return self.install_from_file(source, distdir)
-        elif source and urlparse.urlparse(source).scheme:
+        elif source and urllib.parse.urlparse(source).scheme:
             return self.install_from_url(source, distdir)
         else:
             if source is None and 'MOZ_ARTIFACT_REVISION' in os.environ:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/base.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/base.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import json
 import logging
@@ -482,7 +482,7 @@
             for flag in flags:
                 if flag == '-j':
                     try:
-                        flag = flags.next()
+                        flag = next(flags)
                     except StopIteration:
                         break
                     try:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/config_status.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/config_status.py	(refactored)
@@ -6,7 +6,7 @@
 # drop-in replacement for autoconf 2.13's config.status, with features
 # borrowed from autoconf > 2.5, and additional features.
 
-from __future__ import absolute_import, print_function
+
 
 import logging
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/doctor.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/doctor.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, # You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import os
 import subprocess
@@ -83,7 +83,7 @@
         valid = False
         while not valid and limit > 0:
             try:
-                choice = strtobool(raw_input(prompt + '[Y/N]\n'))
+                choice = strtobool(input(prompt + '[Y/N]\n'))
                 valid = True
             except ValueError:
                 print("ERROR! Please enter a valid option!")
@@ -103,11 +103,11 @@
             if status == 'SKIPPED':
                 continue
             self.results.append(result)
-            print('%s...\t%s\n' % (
+            print(('%s...\t%s\n' % (
                    result.get('desc', ''),
                    status
                 )
-            ).expandtabs(40)
+            ).expandtabs(40))
 
     @property
     def platform(self):
@@ -212,7 +212,7 @@
                         fsutil_output = subprocess.check_output(command)
                         status = 'GOOD, FIXED'
                         desc = 'lastaccess disabled systemwide'
-                    except subprocess.CalledProcessError, e:
+                    except subprocess.CalledProcessError as e:
                         desc = 'lastaccess enabled systemwide'
                         if e.output.find('denied') != -1:
                             status = 'BAD, FIX DENIED'
--- firefox-52.9.0esr/python/mozbuild/mozbuild/dotproperties.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/dotproperties.py	(refactored)
@@ -5,7 +5,7 @@
 # This file contains utility functions for reading .properties files, like
 # region.properties.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import codecs
 import re
@@ -14,7 +14,7 @@
 if sys.version_info[0] == 3:
     str_type = str
 else:
-    str_type = basestring
+    str_type = str
 
 class DotProperties:
     r'''A thin representation of a key=value .properties file.'''
@@ -52,7 +52,7 @@
         if not prefix.endswith('.'):
             prefix = prefix + '.'
         indexes = []
-        for k, v in self._properties.iteritems():
+        for k, v in self._properties.items():
             if not k.startswith(prefix):
                 continue
             key = k[len(prefix):]
@@ -73,7 +73,7 @@
         if not prefix.endswith('.'):
             prefix = prefix + '.'
 
-        D = dict((k[len(prefix):], v) for k, v in self._properties.iteritems()
+        D = dict((k[len(prefix):], v) for k, v in self._properties.items()
                  if k.startswith(prefix) and '.' not in k[len(prefix):])
 
         for required_key in required_keys:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/html_build_viewer.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/html_build_viewer.py	(refactored)
@@ -4,16 +4,16 @@
 
 # This module contains code for running an HTTP server to view build info.
 
-from __future__ import absolute_import, unicode_literals
 
-import BaseHTTPServer
+
+import http.server
 import json
 import os
 
 import requests
 
 
-class HTTPHandler(BaseHTTPServer.BaseHTTPRequestHandler):
+class HTTPHandler(http.server.BaseHTTPRequestHandler):
     def do_GET(self):
         s = self.server.wrapper
         p = self.path
@@ -92,7 +92,7 @@
         self.doc_root = doc_root
         self.json_files = {}
 
-        self.server = BaseHTTPServer.HTTPServer((address, port), HTTPHandler)
+        self.server = http.server.HTTPServer((address, port), HTTPHandler)
         self.server.wrapper = self
         self.do_shutdown = False
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/jar.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/jar.py	(refactored)
@@ -8,7 +8,7 @@
 See the documentation for jar.mn on MDC for further details on the format.
 '''
 
-from __future__ import absolute_import
+
 
 import sys
 import os
@@ -17,7 +17,7 @@
 import logging
 from time import localtime
 from MozZipFile import ZipFile
-from cStringIO import StringIO
+from io import StringIO
 from collections import defaultdict
 
 from mozbuild.preprocessor import Preprocessor
@@ -302,9 +302,9 @@
         '''updateManifest replaces the % in the chrome registration entries
         with the given chrome base path, and updates the given manifest file.
         '''
-        myregister = dict.fromkeys(map(lambda s: s.replace('%',
-            chromebasepath), register))
-        addEntriesToListFile(manifestPath, myregister.iterkeys())
+        myregister = dict.fromkeys([s.replace('%',
+            chromebasepath) for s in register])
+        addEntriesToListFile(manifestPath, iter(myregister.keys()))
 
     def makeJar(self, infile, jardir):
         '''makeJar is the main entry point to JarMaker.
@@ -322,7 +322,7 @@
         elif self.relativesrcdir:
             self.localedirs = \
                 self.generateLocaleDirs(self.relativesrcdir)
-        if isinstance(infile, basestring):
+        if isinstance(infile, str):
             logging.info('processing ' + infile)
             self.sourcedirs.append(_normpath(os.path.dirname(infile)))
         pp = self.pp.clone()
@@ -372,7 +372,7 @@
             jarfilepath = jarfile + '.jar'
             try:
                 os.makedirs(os.path.dirname(jarfilepath))
-            except OSError, error:
+            except OSError as error:
                 if error.errno != errno.EEXIST:
                     raise
             jf = ZipFile(jarfilepath, 'a', lock=True)
@@ -514,7 +514,7 @@
             # remove previous link or file
             try:
                 os.remove(out)
-            except OSError, e:
+            except OSError as e:
                 if e.errno != errno.ENOENT:
                     raise
             return open(out, 'wb')
@@ -525,7 +525,7 @@
             if not os.path.isdir(outdir):
                 try:
                     os.makedirs(outdir)
-                except OSError, error:
+                except OSError as error:
                     if error.errno != errno.EEXIST:
                         raise
             return out
@@ -541,7 +541,7 @@
             # remove previous link or file
             try:
                 os.remove(out)
-            except OSError, e:
+            except OSError as e:
                 if e.errno != errno.ENOENT:
                     raise
             if sys.platform != 'win32':
--- firefox-52.9.0esr/python/mozbuild/mozbuild/mach_commands.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/mach_commands.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, # You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import errno
@@ -136,7 +136,7 @@
         # terminal is a blessings.Terminal.
         self._t = terminal
         self._fh = sys.stdout
-        self.tiers = monitor.tiers.tier_status.viewitems()
+        self.tiers = monitor.tiers.tier_status.items()
 
     def clear(self):
         """Removes the footer from the current terminal."""
@@ -802,7 +802,7 @@
             dirpath = None
 
         type_counts = database.type_counts(dirpath)
-        sorted_counts = sorted(type_counts.iteritems(),
+        sorted_counts = sorted(iter(type_counts.items()),
             key=operator.itemgetter(1))
 
         total = 0
@@ -957,7 +957,7 @@
             processes[i].run()
 
         exit_code = 0
-        for process in processes.values():
+        for process in list(processes.values()):
             status = process.wait()
             if status:
                 exit_code = status
--- firefox-52.9.0esr/python/mozbuild/mozbuild/makeutil.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/makeutil.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import os
 import re
@@ -66,7 +66,7 @@
         self._list = []
         self._set = set()
 
-    def __nonzero__(self):
+    def __bool__(self):
         return bool(self._set)
 
     def __iter__(self):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/milestone.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/milestone.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/mozconfig.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/mozconfig.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import filecmp
 import os
@@ -306,7 +306,7 @@
 
         # Environment variables also appear as shell variables, but that's
         # uninteresting duplication of information. Filter them out.
-        filt = lambda x, y: {k: v for k, v in x.items() if k not in y}
+        filt = lambda x, y: {k: v for k, v in list(x.items()) if k not in y}
         result['vars'] = diff_vars(
             filt(parsed['vars_before'], parsed['env_before']),
             filt(parsed['vars_after'], parsed['env_after'])
--- firefox-52.9.0esr/python/mozbuild/mozbuild/mozinfo.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/mozinfo.py	(refactored)
@@ -5,7 +5,7 @@
 # This module produces a JSON file that provides basic build info and
 # configuration metadata.
 
-from __future__ import absolute_import
+
 
 import os
 import re
@@ -154,7 +154,7 @@
     and what keys are produced.
     """
     build_conf = build_dict(config, env)
-    if isinstance(file, basestring):
+    if isinstance(file, str):
         file = open(file, 'wb')
 
     json.dump(build_conf, file, sort_keys=True, indent=4)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/preprocessor.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/preprocessor.py	(refactored)
@@ -27,7 +27,8 @@
 import re
 from optparse import OptionParser
 import errno
-from makeutil import Makefile
+from .makeutil import Makefile
+from functools import reduce
 
 # hack around win32 mangling our line endings
 # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65443
@@ -56,7 +57,7 @@
         self.__ignore_whitespace()
         self.e = self.__get_logical_or()
         if self.content:
-            raise Expression.ParseError, self
+            raise Expression.ParseError(self)
 
     def __get_logical_or(self):
         """
@@ -157,7 +158,7 @@
                 if word_len:
                     rv = Expression.__ASTLeaf('string', self.content[:word_len])
                 else:
-                    raise Expression.ParseError, self
+                    raise Expression.ParseError(self)
         self.__strip(word_len)
         self.__ignore_whitespace()
         return rv
@@ -196,7 +197,7 @@
                 return left and right
             elif tok[1].value == '||':
                 return left or right
-            raise Expression.ParseError, self
+            raise Expression.ParseError(self)
 
         # Mapping from token types to evaluator functions
         # Apart from (non-)equality, all these can be simple lambda forms.
@@ -230,7 +231,7 @@
         def __repr__(self):
             return self.value.__repr__()
 
-    class ParseError(StandardError):
+    class ParseError(Exception):
         """
         Error raised when parsing fails.
         It has two members, offset and content, which give the offset of the
@@ -278,7 +279,7 @@
         self.context = Context()
         for k,v in {'FILE': '',
                     'LINE': 0,
-                    'DIRECTORY': os.path.abspath('.')}.iteritems():
+                    'DIRECTORY': os.path.abspath('.')}.items():
             self.context[k] = v
         self.actionLevel = 0
         self.disableLevel = 0
@@ -292,21 +293,21 @@
         self.cmds = {}
         for cmd, level in {'define': 0,
                            'undef': 0,
-                           'if': sys.maxint,
-                           'ifdef': sys.maxint,
-                           'ifndef': sys.maxint,
+                           'if': sys.maxsize,
+                           'ifdef': sys.maxsize,
+                           'ifndef': sys.maxsize,
                            'else': 1,
                            'elif': 1,
                            'elifdef': 1,
                            'elifndef': 1,
-                           'endif': sys.maxint,
+                           'endif': sys.maxsize,
                            'expand': 0,
                            'literal': 0,
                            'filter': 0,
                            'unfilter': 0,
                            'include': 0,
                            'includesubst': 0,
-                           'error': 0}.iteritems():
+                           'error': 0}.items():
             self.cmds[cmd] = (level, getattr(self, 'do_' + cmd))
         self.out = sys.stdout
         self.setMarker(marker)
@@ -469,7 +470,7 @@
                 raise Preprocessor.Error(self, "--depend doesn't work with stdout",
                                          None)
             try:
-                from makeutil import Makefile
+                from .makeutil import Makefile
             except:
                 raise Preprocessor.Error(self, "--depend requires the "
                                                "mozbuild.makeutil module", None)
@@ -684,7 +685,7 @@
         current = dict(self.filters)
         for f in filters:
             current[f] = getattr(self, 'filter_' + f)
-        filterNames = current.keys()
+        filterNames = list(current.keys())
         filterNames.sort()
         self.filters = [(fn, current[fn]) for fn in filterNames]
         return
@@ -694,7 +695,7 @@
         for f in filters:
             if f in current:
                 del current[f]
-        filterNames = current.keys()
+        filterNames = list(current.keys())
         filterNames.sort()
         self.filters = [(fn, current[fn]) for fn in filterNames]
         return
@@ -739,7 +740,7 @@
         args can either be a file name, or a file-like object.
         Files should be opened, and will be closed after processing.
         """
-        isName = type(args) == str or type(args) == unicode
+        isName = type(args) == str or type(args) == str
         oldCheckLineNumbers = self.checkLineNumbers
         self.checkLineNumbers = False
         if isName:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/pythonutil.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/pythonutil.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import os
 import sys
@@ -11,7 +11,7 @@
 def iter_modules_in_path(*paths):
     paths = [os.path.abspath(os.path.normcase(p)) + os.sep
              for p in paths]
-    for name, module in sys.modules.items():
+    for name, module in list(sys.modules.items()):
         if not hasattr(module, '__file__'):
             continue
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/shellutil.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/shellutil.py	(refactored)
@@ -15,7 +15,7 @@
     # which matches the pattern and captures it in a named match group.
     # The group names and patterns are given as arguments.
     all_tokens = '|'.join('(?P<%s>%s)' % (name, value)
-                          for name, value in tokens.iteritems())
+                          for name, value in tokens.items())
     nonescaped = r'(?<!\\)(?:%s)' % all_tokens
 
     # The final pattern matches either the above pattern, or an escaped
@@ -96,7 +96,7 @@
             self.cline = self.cline[m.end():]
 
             match = {name: value
-                     for name, value in m.groupdict().items() if value}
+                     for name, value in list(m.groupdict().items()) if value}
             if 'quote' in match:
                 # " or ' start a quoted string
                 if match['quote'] == '"':
@@ -144,7 +144,7 @@
             self._push(self.cline[:m.start()])
             self.cline = self.cline[m.end():]
             match = {name: value
-                     for name, value in m.groupdict().items() if value}
+                     for name, value in list(m.groupdict().items()) if value}
             if 'quote' in match:
                 # a double quote ends the quoted string, so go back to
                 # unquoted parsing
--- firefox-52.9.0esr/python/mozbuild/mozbuild/sphinx.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/sphinx.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import importlib
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/testing.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/testing.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
-
-import cPickle as pickle
+
+
+import pickle as pickle
 import os
 import sys
 
@@ -62,7 +62,7 @@
         if test_defaults:
             with open(test_defaults, 'rb') as fh:
                 defaults = pickle.load(fh)
-        for path, tests in test_data.items():
+        for path, tests in list(test_data.items()):
             for metadata in tests:
                 if defaults:
                     manifest = metadata['manifest']
@@ -303,7 +303,7 @@
 WEB_PLATFORM_TESTS_FLAVORS = ('web-platform-tests',)
 
 def all_test_flavors():
-    return ([v[0] for v in TEST_MANIFESTS.values()] +
+    return ([v[0] for v in list(TEST_MANIFESTS.values())] +
             list(REFTEST_FLAVORS) +
             list(WEB_PLATFORM_TESTS_FLAVORS) +
             ['python'])
@@ -445,7 +445,7 @@
     only a few tests need to be run.
     """
     flavor_info = {flavor: (root, prefix, install)
-                   for (flavor, root, prefix, install) in TEST_MANIFESTS.values()}
+                   for (flavor, root, prefix, install) in list(TEST_MANIFESTS.values())}
     objdir_dest = mozpath.join(topobjdir, tests_root)
 
     converter = SupportFilesConverter()
@@ -527,7 +527,7 @@
         paths_file = os.path.join(context.config.topsrcdir, "testing",
                                   "web-platform", "tests", "tools", "localpaths.py")
         _globals = {"__file__": paths_file}
-        execfile(paths_file, _globals)
+        exec(compile(open(paths_file).read(), paths_file, 'exec'), _globals)
         import manifest as wptmanifest
     finally:
         sys.path = old_path
--- firefox-52.9.0esr/python/mozbuild/mozbuild/util.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/util.py	(refactored)
@@ -5,7 +5,7 @@
 # This file contains miscellaneous utility functions that don't belong anywhere
 # in particular.
 
-from __future__ import absolute_import, unicode_literals, print_function
+
 
 import argparse
 import collections
@@ -36,7 +36,7 @@
 if sys.version_info[0] == 3:
     str_type = str
 else:
-    str_type = basestring
+    str_type = str
 
 if sys.platform == 'win32':
     _kernel32 = ctypes.windll.kernel32
@@ -78,7 +78,7 @@
     return h.hexdigest()
 
 
-class EmptyValue(unicode):
+class EmptyValue(str):
     """A dummy type that behaves like an empty string and sequence.
 
     This type exists in order to support
@@ -92,7 +92,7 @@
 class ReadOnlyNamespace(object):
     """A class for objects with immutable attributes set at initialization."""
     def __init__(self, **kwargs):
-        for k, v in kwargs.iteritems():
+        for k, v in kwargs.items():
             super(ReadOnlyNamespace, self).__setattr__(k, v)
 
     def __delattr__(self, key):
@@ -152,7 +152,7 @@
     if d and not os.path.exists(path):
         try:
             os.makedirs(d)
-        except OSError, error:
+        except OSError as error:
             if error.errno != errno.EEXIST:
                 raise
 
@@ -224,7 +224,7 @@
         self.mode = mode
 
     def write(self, buf):
-        if isinstance(buf, unicode):
+        if isinstance(buf, str):
             buf = buf.encode('utf-8')
         BytesIO.write(self, buf)
 
@@ -381,7 +381,7 @@
     def __add__(self, other):
         # Allow None and EmptyValue is a special case because it makes undefined
         # variable references in moz.build behave better.
-        other = [] if isinstance(other, (types.NoneType, EmptyValue)) else other
+        other = [] if isinstance(other, (type(None), EmptyValue)) else other
         if not isinstance(other, list):
             raise ValueError('Only lists can be appended to lists.')
 
@@ -390,7 +390,7 @@
         return new_list
 
     def __iadd__(self, other):
-        other = [] if isinstance(other, (types.NoneType, EmptyValue)) else other
+        other = [] if isinstance(other, (type(None), EmptyValue)) else other
         if not isinstance(other, list):
             raise ValueError('Only lists can be appended to lists.')
 
@@ -542,14 +542,14 @@
     functions below.
     """
     assert isinstance(flags, dict)
-    assert all(isinstance(v, type) for v in flags.values())
+    assert all(isinstance(v, type) for v in list(flags.values()))
 
     class Flags(object):
-        __slots__ = flags.keys()
+        __slots__ = list(flags.keys())
         _flags = flags
 
         def update(self, **kwargs):
-            for k, v in kwargs.iteritems():
+            for k, v in kwargs.items():
                 setattr(self, k, v)
 
         def __getattr__(self, name):
@@ -1080,14 +1080,14 @@
     # issue.  So we do a little dance to filter it out ourselves.
     dummy_fill_value = ("dummy",)
     def filter_out_dummy(iterable):
-        return itertools.ifilter(lambda x: x != dummy_fill_value,
+        return filter(lambda x: x != dummy_fill_value,
                                  iterable)
 
     # From the itertools documentation, slightly modified:
     def grouper(n, iterable):
         "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
         args = [iter(iterable)] * n
-        return itertools.izip_longest(fillvalue=dummy_fill_value, *args)
+        return itertools.zip_longest(fillvalue=dummy_fill_value, *args)
 
     for i, unified_group in enumerate(grouper(files_per_unified_file,
                                               files)):
@@ -1104,7 +1104,7 @@
         [(1,2), (3,4), (5,6)]
     '''
     i = iter(iterable)
-    return itertools.izip_longest(i, i)
+    return itertools.zip_longest(i, i)
 
 
 VARIABLES_RE = re.compile('\$\((\w+)\)')
@@ -1122,7 +1122,7 @@
         value = variables.get(name)
         if not value:
             continue
-        if not isinstance(value, types.StringTypes):
+        if not isinstance(value, (str,)):
             value = ' '.join(value)
         result += value
     return result
@@ -1149,7 +1149,7 @@
     pass
 
 
-class EnumString(unicode):
+class EnumString(str):
     '''A string type that only can have a limited set of values, similarly to
     an Enum, and can only be compared against that set of values.
 
@@ -1185,19 +1185,18 @@
     # quoting could be done with either ' or ".
     if c == "'":
         return "\\'"
-    return unicode(c.encode('unicode_escape'))
+    return str(c.encode('unicode_escape'))
 
 # Mapping table between raw characters below \x80 and their escaped
 # counterpart, when they differ
 _INDENTED_REPR_TABLE = {
     c: e
-    for c, e in map(lambda x: (x, _escape_char(x)),
-                    map(unichr, range(128)))
+    for c, e in [(x, _escape_char(x)) for x in list(map(chr, list(range(128))))]
     if c != e
 }
 # Regexp matching all characters to escape.
 _INDENTED_REPR_RE = re.compile(
-    '([' + ''.join(_INDENTED_REPR_TABLE.values()) + ']+)')
+    '([' + ''.join(list(_INDENTED_REPR_TABLE.values())) + ']+)')
 
 
 def indented_repr(o, indent=4):
@@ -1223,7 +1222,7 @@
         elif isinstance(o, bytes):
             yield 'b'
             yield repr(o)
-        elif isinstance(o, unicode):
+        elif isinstance(o, str):
             yield "'"
             # We want a readable string (non escaped unicode), but some
             # special characters need escaping (e.g. \n, \t, etc.)
@@ -1253,11 +1252,11 @@
     if isinstance(obj, dict):
         return {
             encode(k, encoding): encode(v, encoding)
-            for k, v in obj.iteritems()
+            for k, v in obj.items()
         }
     if isinstance(obj, bytes):
         return obj
-    if isinstance(obj, unicode):
+    if isinstance(obj, str):
         return obj.encode(encoding)
     if isinstance(obj, Iterable):
         return [encode(i, encoding) for i in obj]
--- firefox-52.9.0esr/python/mozbuild/mozbuild/vendor_rust.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/vendor_rust.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, # You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 from distutils.version import LooseVersion
 import logging
--- firefox-52.9.0esr/python/mozbuild/mozbuild/virtualenv.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/virtualenv.py	(refactored)
@@ -5,7 +5,7 @@
 # This file contains code for populating the virtualenv environment for
 # Mozilla's build system. It is typically called as part of configure.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import distutils.sysconfig
 import os
@@ -461,8 +461,8 @@
         and call .ensure() and .activate() to make the virtualenv active.
         """
 
-        execfile(self.activate_path, dict(__file__=self.activate_path))
-        if isinstance(os.environ['PATH'], unicode):
+        exec(compile(open(self.activate_path).read(), self.activate_path, 'exec'), dict(__file__=self.activate_path))
+        if isinstance(os.environ['PATH'], str):
             os.environ['PATH'] = os.environ['PATH'].encode('utf-8')
 
     def install_pip_package(self, package):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/buildlist.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/buildlist.py	(refactored)
@@ -7,7 +7,7 @@
 
 Usage: buildlist.py <filename> <entry> [<entry> ...]
 '''
-from __future__ import absolute_import, print_function
+
 
 import sys
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/cl.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/cl.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import ctypes
 import os
@@ -55,7 +55,7 @@
             break
 
     if target is None:
-        print >>sys.stderr, "No target set"
+        print("No target set", file=sys.stderr)
         return 1
 
     # Assume the source file is the last argument
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/dump_env.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/dump_env.py	(refactored)
@@ -6,5 +6,5 @@
 # native paths printed on Windows so that these paths can be incorporated
 # into Python configure's environment.
 import os
-for key, value in os.environ.items():
-    print('%s=%s' % (key, value))
+for key, value in list(os.environ.items()):
+    print(('%s=%s' % (key, value)))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/explode_aar.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/explode_aar.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import errno
@@ -44,7 +44,7 @@
     assets = mozpath.join(destdir, 'assets')
     try:
         os.rmdir(assets)
-    except OSError, e:
+    except OSError as e:
         if e.errno in (errno.ENOTEMPTY, errno.ENOENT):
             pass
         else:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/file_generate.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/file_generate.py	(refactored)
@@ -6,7 +6,7 @@
 # the arguments that can be used to generate the output file, call the
 # script's |main| method with appropriate arguments.
 
-from __future__ import absolute_import, print_function
+
 
 import argparse
 import imp
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/generate_suggestedsites.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/generate_suggestedsites.py	(refactored)
@@ -26,7 +26,7 @@
 directory e.g. raw/suggestedsites.json, raw-pt-rBR/suggestedsites.json.
 '''
 
-from __future__ import absolute_import, print_function
+
 
 import argparse
 import copy
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/generate_symbols_file.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/generate_symbols_file.py	(refactored)
@@ -2,12 +2,12 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import buildconfig
 import os
-from StringIO import StringIO
+from io import StringIO
 from mozbuild.preprocessor import Preprocessor
 from mozbuild.util import DefinesAction
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/jar_maker.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/jar_maker.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import sys
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/make_dmg.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/make_dmg.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import print_function
+
 
 from mozbuild.base import MozbuildObject
 from mozpack import dmg
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/output_searchplugins_list.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/output_searchplugins_list.py	(refactored)
@@ -18,4 +18,4 @@
 else:
   engines = searchinfo["default"]["visibleDefaultEngines"]
 
-print '\n'.join(engines)
+print('\n'.join(engines))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/package_fennec_apk.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/package_fennec_apk.py	(refactored)
@@ -6,7 +6,7 @@
 Script to produce an Android package (.apk) for Fennec.
 '''
 
-from __future__ import absolute_import, print_function
+
 
 import argparse
 import buildconfig
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/preprocessor.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/preprocessor.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import sys
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/process_define_files.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/process_define_files.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import os
@@ -55,7 +55,7 @@
                                 'CONFIGURE_DEFINE_FILE')
                         defines = '\n'.join(sorted(
                             '#define %s %s' % (name, val)
-                            for name, val in config.defines.iteritems()
+                            for name, val in config.defines.items()
                             if name not in config.non_global_defines))
                         l = l[:m.start('cmd') - 1] \
                             + defines + l[m.end('name'):]
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/process_install_manifest.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/process_install_manifest.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/test_archive.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/test_archive.py	(refactored)
@@ -8,7 +8,7 @@
 # It is defined inline because this was easiest to make test archive
 # generation faster.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import itertools
@@ -433,7 +433,7 @@
 # "common" is our catch all archive and it ignores things from other archives.
 # Verify nothing sneaks into ARCHIVE_FILES without a corresponding exclusion
 # rule in the "common" archive.
-for k, v in ARCHIVE_FILES.items():
+for k, v in list(ARCHIVE_FILES.items()):
     # Skip mozharness because it isn't staged.
     if k in ('common', 'mozharness'):
         continue
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/webidl.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/webidl.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import sys
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/xpccheck.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/xpccheck.py	(refactored)
@@ -8,7 +8,7 @@
 Usage: xpccheck.py <directory> [<directory> ...]
 '''
 
-from __future__ import absolute_import
+
 
 import sys
 import os
@@ -40,7 +40,7 @@
         break
    
     if not found:
-      print >>sys.stderr, "TEST-UNEXPECTED-FAIL | xpccheck | test %s is missing from test manifest %s!" % (name, os.path.join(directory, 'xpcshell.ini'))
+      print("TEST-UNEXPECTED-FAIL | xpccheck | test %s is missing from test manifest %s!" % (name, os.path.join(directory, 'xpcshell.ini')), file=sys.stderr)
       sys.exit(1)
 
 def verifyIniFile(initests, directory):
@@ -60,12 +60,12 @@
         break
 
     if not found:
-      print >>sys.stderr, "TEST-UNEXPECTED-FAIL | xpccheck | found %s in xpcshell.ini and not in directory '%s'" % (name, directory)
+      print("TEST-UNEXPECTED-FAIL | xpccheck | found %s in xpcshell.ini and not in directory '%s'" % (name, directory), file=sys.stderr)
       sys.exit(1)
 
 def main(argv):
   if len(argv) < 2:
-    print >>sys.stderr, "Usage: xpccheck.py <topsrcdir> <directory> [<directory> ...]"
+    print("Usage: xpccheck.py <topsrcdir> <directory> [<directory> ...]", file=sys.stderr)
     sys.exit(1)
 
   topsrcdir = argv[0]
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/xpidl-process.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/xpidl-process.py	(refactored)
@@ -7,7 +7,7 @@
 # input IDL file(s). It's purpose is to directly support the build
 # system. The API will change to meet the needs of the build system.
 
-from __future__ import absolute_import
+
 
 import argparse
 import os
@@ -58,7 +58,7 @@
 
     # TODO use FileAvoidWrite once it supports binary mode.
     xpt_path = os.path.join(xpt_dir, '%s.xpt' % module)
-    xpt_link(xpts.values()).write(xpt_path)
+    xpt_link(list(xpts.values())).write(xpt_path)
 
     rule.add_targets([xpt_path])
     if deps_dir:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/action/zip.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/action/zip.py	(refactored)
@@ -5,7 +5,7 @@
 # This script creates a zip file, but will also strip any binaries
 # it finds before adding them to the zip.
 
-from __future__ import absolute_import
+
 
 from mozpack.files import FileFinder
 from mozpack.copier import Jarrer
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/android_eclipse.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/android_eclipse.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import itertools
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/base.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/base.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 from abc import (
     ABCMeta,
@@ -30,15 +30,13 @@
 from mozbuild.base import ExecutionSummary
 
 
-class BuildBackend(LoggingMixin):
+class BuildBackend(LoggingMixin, metaclass=ABCMeta):
     """Abstract base class for build backends.
 
     A build backend is merely a consumer of the build configuration (the output
     of the frontend processing). It does something with said data. What exactly
     is the discretion of the specific implementation.
     """
-
-    __metaclass__ = ABCMeta
 
     def __init__(self, environment):
         assert isinstance(environment, ConfigEnvironment)
@@ -252,7 +250,7 @@
         srcdir = mozpath.dirname(obj.input_path)
         pp.context.update({
             k: ' '.join(v) if isinstance(v, list) else v
-            for k, v in obj.config.substs.iteritems()
+            for k, v in obj.config.substs.items()
         })
         pp.context.update(
             top_srcdir=obj.topsrcdir,
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/common.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/common.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
-
-import cPickle as pickle
+
+
+import pickle as pickle
 import itertools
 import json
 import os
@@ -194,11 +194,11 @@
     def add_defaults(self, manifest):
         if not hasattr(manifest, 'manifest_defaults'):
             return
-        for sub_manifest, defaults in manifest.manifest_defaults.items():
+        for sub_manifest, defaults in list(manifest.manifest_defaults.items()):
             self.manifest_defaults[sub_manifest] = defaults
 
     def add_installs(self, obj, topsrcdir):
-        for src, (dest, _) in obj.installs.iteritems():
+        for src, (dest, _) in obj.installs.items():
             key = src[len(topsrcdir)+1:]
             self.installs_by_path[key].append((src, dest))
         for src, pat, dest in obj.pattern_installs:
@@ -379,7 +379,7 @@
 
         path = mozpath.join(self.environment.topobjdir, 'test-installs.pkl')
         with self._write_file(path, mode='rb') as fh:
-            pickle.dump({k: v for k, v in self._test_manager.installs_by_path.items()
+            pickle.dump({k: v for k, v in list(self._test_manager.installs_by_path.items())
                          if k in self._test_manager.deferred_installs},
                         fh,
                         protocol=2)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/configenvironment.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/configenvironment.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import os
 import sys
@@ -17,7 +17,7 @@
 
 
 if sys.version_info.major == 2:
-    text_type = unicode
+    text_type = str
 else:
     text_type = str
 
@@ -176,7 +176,7 @@
                 except UnicodeDecodeError:
                     return v.decode('utf-8', 'replace')
 
-        for k, v in self.substs.items():
+        for k, v in list(self.substs.items()):
             if not isinstance(v, StringTypes):
                 if isinstance(v, Iterable):
                     type(v)(decode(i) for i in v)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/cpp_eclipse.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/cpp_eclipse.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import errno
 import random
@@ -218,12 +218,12 @@
         cproject_header = cproject_header.replace('@MACH_COMMAND@', os.path.join(self.environment.topsrcdir, 'mach'))
         fh.write(cproject_header)
 
-        for path, defines in self._paths_to_defines.items():
+        for path, defines in list(self._paths_to_defines.items()):
             folderinfo = CPROJECT_TEMPLATE_FOLDER_INFO_HEADER
             folderinfo = folderinfo.replace('@FOLDER_ID@', str(random.randint(1000000, 99999999999)))
             folderinfo = folderinfo.replace('@FOLDER_NAME@', 'tree/' + path)
             fh.write(folderinfo)
-            for k, v in defines.items():
+            for k, v in list(defines.items()):
                 define = ET.Element('listOptionValue')
                 define.set('builtIn', 'false')
                 define.set('value', str(k) + "=" + str(v))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/fastermake.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/fastermake.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals, print_function
+
 
 from mozbuild.backend.base import PartialBackend
 from mozbuild.backend.common import CommonBackend
@@ -130,12 +130,12 @@
             if value is not None:
                 mk.add_statement('%s = %s' % (var, value))
 
-        install_manifests_bases = self._install_manifests.keys()
+        install_manifests_bases = list(self._install_manifests.keys())
 
         # Add information for chrome manifest generation
         manifest_targets = []
 
-        for target, entries in self._manifest_entries.iteritems():
+        for target, entries in self._manifest_entries.items():
             manifest_targets.append(target)
             install_target = mozpath.basedir(target, install_manifests_bases)
             self._install_manifests[install_target].add_content(
@@ -144,16 +144,16 @@
 
         # Add information for install manifests.
         mk.add_statement('INSTALL_MANIFESTS = %s'
-                         % ' '.join(self._install_manifests.keys()))
+                         % ' '.join(list(self._install_manifests.keys())))
 
         # Add dependencies we infered:
-        for target, deps in self._dependencies.iteritems():
+        for target, deps in self._dependencies.items():
             mk.create_rule([target]).add_dependencies(
                 '$(TOPOBJDIR)/%s' % d for d in deps)
 
         mk.add_statement('include $(TOPSRCDIR)/config/faster/rules.mk')
 
-        for base, install_manifest in self._install_manifests.iteritems():
+        for base, install_manifest in self._install_manifests.items():
             with self._write_file(
                     mozpath.join(self.environment.topobjdir, 'faster',
                                  'install_%s' % base.replace('/', '_'))) as fh:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/mach_commands.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/mach_commands.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import argparse
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/recursivemake.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/recursivemake.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import logging
 import os
@@ -12,7 +12,7 @@
     defaultdict,
     namedtuple,
 )
-from StringIO import StringIO
+from io import StringIO
 from itertools import chain
 
 from mozpack.manifests import (
@@ -74,6 +74,7 @@
 )
 from ..makeutil import Makefile
 from mozbuild.shellutil import quote as shell_quote
+from functools import reduce
 
 MOZBUILD_VARIABLES = [
     b'ANDROID_APK_NAME',
@@ -214,7 +215,7 @@
         self.fh.write(buf)
 
     def write_once(self, buf):
-        if isinstance(buf, unicode):
+        if isinstance(buf, str):
             buf = buf.encode('utf-8')
         if b'\n' + buf not in self.fh.getvalue():
             self.write(buf)
@@ -283,8 +284,8 @@
         Helper function to call a filter from compute_dependencies and
         traverse.
         """
-        return filter(current, self._traversal.get(current,
-            self.SubDirectories()))
+        return list(filter(current, self._traversal.get(current,
+            self.SubDirectories())))
 
     def compute_dependencies(self, filter=None):
         """
@@ -638,7 +639,7 @@
         convenience variables, and the other dependency definitions for a
         hopefully proper directory traversal.
         """
-        for tier, no_skip in self._no_skip.items():
+        for tier, no_skip in list(self._no_skip.items()):
             self.log(logging.DEBUG, 'fill_root_mk', {
                 'number': len(no_skip), 'tier': tier
                 }, 'Using {number} directories during {tier}')
@@ -684,7 +685,7 @@
         for tier, filter in filters:
             main, all_deps = \
                 self._traversal.compute_dependencies(filter)
-            for dir, deps in all_deps.items():
+            for dir, deps in list(all_deps.items()):
                 if deps is not None or (dir in self._idl_dirs \
                                         and tier == 'export'):
                     rule = root_deps_mk.create_rule(['%s/%s' % (dir, tier)])
@@ -697,7 +698,7 @@
                 rule.add_dependencies('%s/%s' % (d, tier) for d in main)
 
         all_compile_deps = reduce(lambda x,y: x|y,
-            self._compile_graph.values()) if self._compile_graph else set()
+            list(self._compile_graph.values())) if self._compile_graph else set()
         compile_roots = set(self._compile_graph.keys()) - all_compile_deps
 
         rule = root_deps_mk.create_rule(['recurse_compile'])
@@ -839,7 +840,7 @@
         self._fill_root_mk()
 
         # Make the master test manifest files.
-        for flavor, t in self._test_manifests.items():
+        for flavor, t in list(self._test_manifests.items()):
             install_prefix, manifests = t
             manifest_stem = mozpath.join(install_prefix, '%s.ini' % flavor)
             self._write_master_test_manifest(mozpath.join(
@@ -945,7 +946,7 @@
         for p in ('Makefile', 'backend.mk', '.deps/.mkdir.done'):
             build_files.add_optional_exists(p)
 
-        for idl in manager.idls.values():
+        for idl in list(manager.idls.values()):
             self._install_manifests['dist_idl'].add_symlink(idl['source'],
                 idl['basename'])
             self._install_manifests['dist_include'].add_optional_exists('%s.h'
@@ -992,7 +993,7 @@
 
         interfaces_manifests = []
         dist_dir = mozpath.join(self.environment.topobjdir, 'dist')
-        for manifest, entries in manager.interface_manifests.items():
+        for manifest, entries in list(manager.interface_manifests.items()):
             interfaces_manifests.append(mozpath.join('$(DEPTH)', manifest))
             for xpt in sorted(entries):
                 registered_xpt_files.add(mozpath.join(
@@ -1052,7 +1053,7 @@
         # Don't allow files to be defined multiple times unless it is allowed.
         # We currently allow duplicates for non-test files or test files if
         # the manifest is listed as a duplicate.
-        for source, (dest, is_test) in obj.installs.items():
+        for source, (dest, is_test) in list(obj.installs.items()):
             try:
                 self._install_manifests['_test_files'].add_symlink(source, dest)
             except ValueError:
@@ -1386,7 +1387,7 @@
         man_dir = mozpath.join(self.environment.topobjdir, '_build_manifests',
             dest)
 
-        for k, manifest in manifests.items():
+        for k, manifest in list(manifests.items()):
             with self._write_file(mozpath.join(man_dir, k)) as fh:
                 manifest.write(fileobj=fh)
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/tup.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/tup.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import os
 
@@ -253,7 +253,7 @@
         backend_file = self._get_backend_file('xpcom/xpidl')
         backend_file.export_shell()
 
-        for module, data in sorted(manager.modules.iteritems()):
+        for module, data in sorted(manager.modules.items()):
             dest, idls = data
             cmd = [
                 '$(PYTHON_PATH)',
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/visualstudio.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/visualstudio.py	(refactored)
@@ -5,7 +5,7 @@
 # This file contains a build backend for generating Visual Studio project
 # files.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import errno
 import os
@@ -218,7 +218,7 @@
             includes = [os.path.normpath(i) for i in includes]
 
             defines = []
-            for k, v in self._paths_to_defines.get(path, {}).items():
+            for k, v in list(self._paths_to_defines.get(path, {}).items()):
                 if v is True:
                     defines.append(k)
                 else:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/codecoverage/chrome_map.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/codecoverage/chrome_map.py	(refactored)
@@ -5,7 +5,7 @@
 from collections import defaultdict
 import json
 import os
-import urlparse
+import urllib.parse
 
 from mach.config import ConfigSettings
 from mach.logging import LoggingManager
@@ -42,7 +42,7 @@
         if isinstance(entry, (ManifestChrome, ManifestResource)):
             if isinstance(entry, ManifestResource):
                 dest = entry.target
-                url = urlparse.urlparse(dest)
+                url = urllib.parse.urlparse(dest)
                 if not url.scheme:
                     dest = mozpath.normpath(mozpath.join(entry.base, dest))
                 if url.scheme == 'file':
@@ -99,7 +99,7 @@
             chrome_mapping = self.manifest_handler.chrome_mapping
             overrides = self.manifest_handler.overrides
             json.dump([
-                {k: list(v) for k, v in chrome_mapping.iteritems()},
+                {k: list(v) for k, v in chrome_mapping.items()},
                 overrides,
                 self._install_mapping,
             ], fh, sort_keys=True, indent=2)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/codecoverage/packager.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/codecoverage/packager.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function
+
 
 import argparse
 import sys
@@ -12,7 +12,7 @@
 
 def package_gcno_tree(root, output_file):
     # XXX JarWriter doesn't support unicode strings, see bug 1056859
-    if isinstance(root, unicode):
+    if isinstance(root, str):
         root = root.encode('utf-8')
 
     finder = FileFinder(root)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/compilation/codecomplete.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/compilation/codecomplete.py	(refactored)
@@ -4,7 +4,7 @@
 
 # This modules provides functionality for dealing with code completion.
 
-from __future__ import absolute_import
+
 
 import os
 
@@ -59,5 +59,5 @@
         # Drop the first flag since that is the pathname of the compiler.
         flags = (shell_split(build_vars[cc]) + shell_split(build_vars[name]))[1:]
 
-        print(' '.join(shell_quote(arg)
-                       for arg in util.sanitize_cflags(flags)))
+        print((' '.join(shell_quote(arg)
+                       for arg in util.sanitize_cflags(flags))))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/compilation/database.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/compilation/database.py	(refactored)
@@ -118,7 +118,7 @@
 
         db = []
 
-        for (directory, filename), cmd in self._db.iteritems():
+        for (directory, filename), cmd in self._db.items():
             env = self._envs[directory]
             cmd = list(cmd)
             cmd.append(filename)
@@ -151,7 +151,7 @@
                 a = expand_variables(a, variables).split()
                 if not a:
                     continue
-                if isinstance(a, types.StringTypes):
+                if isinstance(a, (str,)):
                     c.append(a)
                 else:
                     c.extend(a)
@@ -216,7 +216,7 @@
             value = cenv.substs.get(name)
             if not value:
                 return
-            if isinstance(value, types.StringTypes):
+            if isinstance(value, (str,)):
                 value = value.split()
             db.extend(value)
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/compilation/warnings.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/compilation/warnings.py	(refactored)
@@ -4,7 +4,7 @@
 
 # This modules provides functionality for dealing with compiler warnings.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import errno
 import json
@@ -123,18 +123,18 @@
 
     def __len__(self):
         i = 0
-        for value in self._files.values():
+        for value in list(self._files.values()):
             i += len(value['warnings'])
 
         return i
 
     def __iter__(self):
-        for value in self._files.values():
+        for value in list(self._files.values()):
             for warning in value['warnings']:
                 yield warning
 
     def __contains__(self, item):
-        for value in self._files.values():
+        for value in list(self._files.values()):
             for warning in value['warnings']:
                 if warning == item:
                     return True
@@ -144,7 +144,7 @@
     @property
     def warnings(self):
         """All the CompilerWarning instances in this database."""
-        for value in self._files.values():
+        for value in list(self._files.values()):
             for w in value['warnings']:
                 yield w
 
@@ -152,7 +152,7 @@
         """Returns a mapping of warning types to their counts."""
 
         types = {}
-        for value in self._files.values():
+        for value in list(self._files.values()):
             for warning in value['warnings']:
                 if dirpath and not mozpath.normsep(warning['filename']).startswith(dirpath):
                     continue
@@ -210,7 +210,7 @@
         """
 
         # Need to calculate up front since we are mutating original object.
-        filenames = self._files.keys()
+        filenames = list(self._files.keys())
         for filename in filenames:
             if not os.path.exists(filename):
                 del self._files[filename]
@@ -229,10 +229,10 @@
         obj = {'files': {}}
 
         # All this hackery because JSON can't handle sets.
-        for k, v in self._files.iteritems():
+        for k, v in self._files.items():
             obj['files'][k] = {}
 
-            for k2, v2 in v.iteritems():
+            for k2, v2 in v.items():
                 normalized = v2
 
                 if k2 == 'warnings':
@@ -249,8 +249,8 @@
         self._files = obj['files']
 
         # Normalize data types.
-        for filename, value in self._files.iteritems():
-            for k, v in value.iteritems():
+        for filename, value in self._files.items():
+            for k, v in value.items():
                 if k != 'warnings':
                     continue
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/__init__.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/__init__.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import inspect
 import logging
@@ -193,7 +193,7 @@
         for b in ('None', 'False', 'True', 'int', 'bool', 'any', 'all', 'len',
                   'list', 'tuple', 'set', 'dict', 'isinstance', 'getattr',
                   'hasattr', 'enumerate', 'range', 'zip')
-    }, __import__=forbidden_import, str=unicode)
+    }, __import__=forbidden_import, str=str)
 
     # Expose a limited set of functions from os.path
     OS = ReadOnlyNamespace(path=ReadOnlyNamespace(**{
@@ -333,7 +333,7 @@
         if path:
             self.include_file(path)
 
-        for option in self._options.itervalues():
+        for option in self._options.values():
             # All options must be referenced by some @depends function
             if option not in self._seen:
                 raise ConfigureError(
@@ -437,7 +437,7 @@
                     value = PositiveOptionValue()
                 elif value is False or value == ():
                     value = NegativeOptionValue()
-                elif isinstance(value, types.StringTypes):
+                elif isinstance(value, (str,)):
                     value = PositiveOptionValue((value,))
                 elif isinstance(value, tuple):
                     value = PositiveOptionValue(value)
@@ -477,7 +477,7 @@
         return value
 
     def _dependency(self, arg, callee_name, arg_name=None):
-        if isinstance(arg, types.StringTypes):
+        if isinstance(arg, (str,)):
             prefix, name, values = Option.split_option(arg)
             if values != ():
                 raise ConfigureError("Option must not contain an '='")
@@ -541,7 +541,7 @@
         '''
         when = self._normalize_when(kwargs.get('when'), 'option')
         args = [self._resolve(arg) for arg in args]
-        kwargs = {k: self._resolve(v) for k, v in kwargs.iteritems()
+        kwargs = {k: self._resolve(v) for k, v in kwargs.items()
                                       if k != 'when'}
         option = Option(*args, **kwargs)
         if when:
@@ -622,7 +622,7 @@
         with self.only_when_impl(when):
             what = self._resolve(what)
             if what:
-                if not isinstance(what, types.StringTypes):
+                if not isinstance(what, (str,)):
                     raise TypeError("Unexpected type: '%s'" % type(what).__name__)
                 self.include_file(what)
 
@@ -640,7 +640,7 @@
             (k[:-len('_impl')], getattr(self, k))
             for k in dir(self) if k.endswith('_impl') and k != 'template_impl'
         )
-        glob.update((k, v) for k, v in self.iteritems() if k not in glob)
+        glob.update((k, v) for k, v in self.items() if k not in glob)
 
         # Any function argument to the template must be prepared to be sandboxed.
         # If the template itself returns a function (in which case, it's very
@@ -664,7 +664,7 @@
             def wrapper(*args, **kwargs):
                 args = [maybe_prepare_function(arg) for arg in args]
                 kwargs = {k: maybe_prepare_function(v)
-                          for k, v in kwargs.iteritems()}
+                          for k, v in kwargs.items()}
                 ret = template(*args, **kwargs)
                 if isfunction(ret):
                     # We can't expect the sandboxed code to think about all the
@@ -696,7 +696,7 @@
         for value, required in (
                 (_import, True), (_from, False), (_as, False)):
 
-            if not isinstance(value, types.StringTypes) and (
+            if not isinstance(value, (str,)) and (
                     required or value is not None):
                 raise TypeError("Unexpected type: '%s'" % type(value).__name__)
             if value is not None and not self.RE_MODULE.match(value):
@@ -759,7 +759,7 @@
         name = self._resolve(name, need_help_dependency=False)
         if name is None:
             return
-        if not isinstance(name, types.StringTypes):
+        if not isinstance(name, (str,)):
             raise TypeError("Unexpected type: '%s'" % type(name).__name__)
         if name in data:
             raise ConfigureError(
@@ -849,7 +849,7 @@
                 if isinstance(possible_reasons[0], Option):
                     reason = possible_reasons[0]
         if not reason and (isinstance(value, (bool, tuple)) or
-                           isinstance(value, types.StringTypes)):
+                           isinstance(value, (str,))):
             # A reason can be provided automatically when imply_option
             # is called with an immediate value.
             _, filename, line, _, _, _ = inspect.stack()[1]
@@ -884,10 +884,10 @@
         if not inspect.isfunction(func):
             raise TypeError("Unexpected type: '%s'" % type(func).__name__)
         if func in self._prepared_functions:
-            return func, func.func_globals
+            return func, func.__globals__
 
         glob = SandboxedGlobal(
-            (k, v) for k, v in func.func_globals.iteritems()
+            (k, v) for k, v in func.__globals__.items()
             if (inspect.isfunction(v) and v not in self._templates) or (
                 inspect.isclass(v) and issubclass(v, Exception))
         )
@@ -908,20 +908,20 @@
         # Note this is not entirely bullet proof (if the value is e.g. a list,
         # the list contents could have changed), but covers the bases.
         closure = None
-        if func.func_closure:
+        if func.__closure__:
             def makecell(content):
                 def f():
                     content
-                return f.func_closure[0]
+                return f.__closure__[0]
 
             closure = tuple(makecell(cell.cell_contents)
-                            for cell in func.func_closure)
+                            for cell in func.__closure__)
 
         new_func = wraps(func)(types.FunctionType(
-            func.func_code,
+            func.__code__,
             glob,
             func.__name__,
-            func.func_defaults,
+            func.__defaults__,
             closure
         ))
         @wraps(new_func)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/check_debug_ranges.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/check_debug_ranges.py	(refactored)
@@ -6,7 +6,7 @@
 # to a given compilation unit. This is used as a helper to find a bug in some
 # versions of GNU ld.
 
-from __future__ import absolute_import
+
 
 import subprocess
 import sys
@@ -59,4 +59,4 @@
 
 
 if __name__ == '__main__':
-    print main(*sys.argv[1:])
+    print(main(*sys.argv[1:]))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 from mozbuild.util import EnumString
 from collections import OrderedDict
@@ -56,7 +56,7 @@
     'x86_64': 64,
 }
 
-CPU = EnumString.subclass(*CPU_bitness.keys())
+CPU = EnumString.subclass(*list(CPU_bitness.keys()))
 
 Endianness = EnumString.subclass(
     'big',
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/help.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/help.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import os
 from mozbuild.configure.options import Option
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/libstdcxx.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/libstdcxx.py	(refactored)
@@ -13,7 +13,7 @@
 # will be used from shell, we just print the two assignments and evaluate
 # them from shell.
 
-from __future__ import absolute_import
+
 
 import os
 import subprocess
@@ -76,6 +76,6 @@
 
 if __name__ == '__main__':
     cxx_env = os.environ['CXX']
-    print 'MOZ_LIBSTDCXX_TARGET_VERSION=%s' % find_version(cxx_env)
+    print('MOZ_LIBSTDCXX_TARGET_VERSION=%s' % find_version(cxx_env))
     host_cxx_env = os.environ.get('HOST_CXX', cxx_env)
-    print 'MOZ_LIBSTDCXX_HOST_VERSION=%s' % find_version(host_cxx_env)
+    print('MOZ_LIBSTDCXX_HOST_VERSION=%s' % find_version(host_cxx_env))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/lint.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/lint.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
 
-from StringIO import StringIO
+
+from io import StringIO
 from . import (
     CombinedDependsFunction,
     ConfigureError,
@@ -42,7 +42,7 @@
             # - don't use @imports
             # - don't have a closure
             # - don't use global variables
-            if func in self._imports or func.func_closure:
+            if func in self._imports or func.__closure__:
                 return True
             for op, arg in disassemble_as_iter(func):
                 if op in ('LOAD_GLOBAL', 'STORE_GLOBAL'):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/lint_util.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/lint_util.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import dis
 import inspect
@@ -12,9 +12,9 @@
 # returns an iterator.
 def disassemble_as_iter(co):
     if inspect.ismethod(co):
-        co = co.im_func
+        co = co.__func__
     if inspect.isfunction(co):
-        co = co.func_code
+        co = co.__code__
     code = co.co_code
     n = len(code)
     i = 0
@@ -30,7 +30,7 @@
             extended_arg = 0
             i += 2
             if op == dis.EXTENDED_ARG:
-                extended_arg = arg * 65536L
+                extended_arg = arg * 65536
                 continue
             if op in dis.hasconst:
                 yield opname, co.co_consts[arg]
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/options.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/options.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import os
 import sys
@@ -12,7 +12,7 @@
 
 def istupleofstrings(obj):
     return isinstance(obj, tuple) and len(obj) and all(
-        isinstance(o, types.StringTypes) for o in obj)
+        isinstance(o, (str,)) for o in obj)
 
 
 class OptionValue(tuple):
@@ -71,7 +71,7 @@
     in the form of a tuple for when values are given to the option (in the form
     --option=value[,value2...].
     '''
-    def __nonzero__(self):
+    def __bool__(self):
         return True
 
 
@@ -96,7 +96,7 @@
         if format_data:
             message = message.format(**format_data)
         super(ConflictingOptionError, self).__init__(message)
-        for k, v in format_data.iteritems():
+        for k, v in format_data.items():
             setattr(self, k, v)
 
 
@@ -132,7 +132,7 @@
                 'At least an option name or an environment variable name must '
                 'be given')
         if name:
-            if not isinstance(name, types.StringTypes):
+            if not isinstance(name, (str,)):
                 raise InvalidOptionError('Option must be a string')
             if not name.startswith('--'):
                 raise InvalidOptionError('Option must start with `--`')
@@ -141,7 +141,7 @@
             if not name.islower():
                 raise InvalidOptionError('Option must be all lowercase')
         if env:
-            if not isinstance(env, types.StringTypes):
+            if not isinstance(env, (str,)):
                 raise InvalidOptionError(
                     'Environment variable name must be a string')
             if not env.isupper():
@@ -151,8 +151,8 @@
                 isinstance(nargs, int) and nargs >= 0):
             raise InvalidOptionError(
                 "nargs must be a positive integer, '?', '*' or '+'")
-        if (not isinstance(default, types.StringTypes) and
-                not isinstance(default, (bool, types.NoneType)) and
+        if (not isinstance(default, (str,)) and
+                not isinstance(default, (bool, type(None))) and
                 not istupleofstrings(default)):
             raise InvalidOptionError(
                 'default must be a bool, a string or a tuple of strings')
@@ -224,7 +224,7 @@
                     ', '.join("'%s'" % c for c in choices))
         elif has_choices:
             maxargs = self.maxargs
-            if len(choices) < maxargs and maxargs != sys.maxint:
+            if len(choices) < maxargs and maxargs != sys.maxsize:
                 raise InvalidOptionError('Not enough `choices` for `nargs`')
         self.choices = choices
         self.help = help
@@ -238,7 +238,7 @@
         where prefix is one of 'with', 'without', 'enable' or 'disable'.
         The '=values' part is optional. Values are separated with commas.
         '''
-        if not isinstance(option, types.StringTypes):
+        if not isinstance(option, (str,)):
             raise InvalidOptionError('Option must be a string')
 
         elements = option.split('=', 1)
@@ -291,7 +291,7 @@
     def maxargs(self):
         if isinstance(self.nargs, int):
             return self.nargs
-        return 1 if self.nargs == '?' else sys.maxint
+        return 1 if self.nargs == '?' else sys.maxsize
 
     def _validate_nargs(self, num):
         minargs, maxargs = self.minargs, self.maxargs
@@ -485,5 +485,5 @@
 
     def __iter__(self):
         for d in (self._args, self._extra_args):
-            for arg, pos in d.itervalues():
+            for arg, pos in d.values():
                 yield arg
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import codecs
 import itertools
@@ -52,7 +52,7 @@
 
     def __cmp__(self, other):
         # LooseVersion checks isinstance(StringType), so work around it.
-        if isinstance(other, unicode):
+        if isinstance(other, str):
             other = other.encode('ascii')
         return LooseVersion.__cmp__(self, other)
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/controller/building.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/controller/building.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import getpass
 import json
@@ -108,7 +108,7 @@
         """
         o = []
 
-        for tier, state in self.tiers.items():
+        for tier, state in list(self.tiers.items()):
             t_entry = dict(
                 name=tier,
                 start=state['begin_time'],
@@ -643,8 +643,8 @@
 
         return '\n'.join(lines)
 
-    def __nonzero__(self):
-        relative_values = [v for k, v in self._values.items()
+    def __bool__(self):
+        relative_values = [v for k, v in list(self._values.items())
                            if k not in self.ABSOLUTE_KEYS]
         return (all(v >= 0 for v in relative_values) and
                 any(v > 0 for v in relative_values))
@@ -666,8 +666,8 @@
         """Install test files."""
 
         if self.is_clobber_needed():
-            print(INSTALL_TESTS_CLOBBER.format(
-                  clobber_file=os.path.join(self.topobjdir, 'CLOBBER')))
+            print((INSTALL_TESTS_CLOBBER.format(
+                  clobber_file=os.path.join(self.topobjdir, 'CLOBBER'))))
             sys.exit(1)
 
         if not test_objs:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/controller/clobber.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/controller/clobber.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function
+
 
 r'''This module contains code for managing clobbering of the tree.'''
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/context.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/context.py	(refactored)
@@ -14,7 +14,7 @@
 contain, you've come to the right place.
 """
 
-from __future__ import absolute_import, unicode_literals
+
 
 import os
 
@@ -234,15 +234,15 @@
         This function is transactional: if setitem fails for one of the values,
         the context is not updated at all."""
         if isinstance(iterable, dict):
-            iterable = iterable.items()
+            iterable = list(iterable.items())
 
         update = {}
-        for key, value in itertools.chain(iterable, kwargs.items()):
+        for key, value in itertools.chain(iterable, list(kwargs.items())):
             stored_type = self._validate(key, value)
             # Don't create an instance of stored_type if coercion is needed,
             # until all values are validated.
             update[key] = (value, stored_type)
-        for key, (value, stored_type) in update.items():
+        for key, (value, stored_type) in list(update.items()):
             if not isinstance(value, stored_type):
                 update[key] = stored_type(value)
             else:
@@ -297,7 +297,7 @@
             self.update(value)
 
 
-class FinalTargetValue(ContextDerivedValue, unicode):
+class FinalTargetValue(ContextDerivedValue, str):
     def __new__(cls, context, value=""):
         if not value:
             value = 'dist/'
@@ -307,7 +307,7 @@
                 value += 'bin'
             if context['DIST_SUBDIR']:
                 value += '/' + context['DIST_SUBDIR']
-        return unicode.__new__(cls, value)
+        return str.__new__(cls, value)
 
 
 def Enum(*values):
@@ -355,7 +355,7 @@
                 cls = SourcePath
         return super(PathMeta, cls).__call__(context, value)
 
-class Path(ContextDerivedValue, unicode):
+class Path(ContextDerivedValue, str, metaclass=PathMeta):
     """Stores and resolves a source path relative to a given context
 
     This class is used as a backing type for some of the sandbox variables.
@@ -366,7 +366,6 @@
       - '!objdir/relative/paths'
       - '%/filesystem/absolute/paths'
     """
-    __metaclass__ = PathMeta
 
     def __new__(cls, context, value=None):
         return super(Path, cls).__new__(cls, value)
@@ -386,7 +385,7 @@
     def __cmp__(self, other):
         if isinstance(other, Path) and self.srcdir != other.srcdir:
             return cmp(self.full_path, other.full_path)
-        return cmp(unicode(self), other)
+        return cmp(str(self), other)
 
     # __cmp__ is not enough because unicode has __eq__, __ne__, etc. defined
     # and __cmp__ is only used for those when they don't exist.
@@ -544,7 +543,7 @@
         __slots__ = tuple([name for name, _ in fields])
 
         def __init__(self, context):
-            for fname, ftype in self._fields.items():
+            for fname, ftype in list(self._fields.items()):
                 if issubclass(ftype, ContextDerivedValue):
                     setattr(self, fname, self._fields[fname](context))
                 else:
@@ -614,8 +613,8 @@
     return _TypedListWithAction
 
 WebPlatformTestManifest = TypedNamedTuple("WebPlatformTestManifest",
-                                          [("manifest_path", unicode),
-                                           ("test_root", unicode)])
+                                          [("manifest_path", str),
+                                           ("test_root", str)])
 ManifestparserManifestList = OrderedListWithAction(read_manifestparser_manifest)
 ReftestManifestList = OrderedListWithAction(read_reftest_manifest)
 WptManifestList = TypedListWithAction(WebPlatformTestManifest, read_wpt_manifest)
@@ -623,12 +622,12 @@
 OrderedSourceList = ContextDerivedTypedList(SourcePath, StrictOrderingOnAppendList)
 OrderedTestFlavorList = TypedList(Enum(*all_test_flavors()),
                                   StrictOrderingOnAppendList)
-OrderedStringList = TypedList(unicode, StrictOrderingOnAppendList)
+OrderedStringList = TypedList(str, StrictOrderingOnAppendList)
 DependentTestsEntry = ContextDerivedTypedRecord(('files', OrderedSourceList),
                                                 ('tags', OrderedStringList),
                                                 ('flavors', OrderedTestFlavorList))
 BugzillaComponent = TypedNamedTuple('BugzillaComponent',
-                        [('product', unicode), ('component', unicode)])
+                        [('product', str), ('component', str)])
 
 
 class Files(SubContext):
@@ -764,7 +763,7 @@
         self.test_tags |= other.test_tags
         self.test_flavors |= other.test_flavors
 
-        for k, v in other.items():
+        for k, v in list(other.items()):
             if k == 'IMPACTED_TESTS':
                 self.test_files |= set(mozpath.relpath(e.full_path, e.context.config.topsrcdir)
                                        for e in v.files)
@@ -818,7 +817,7 @@
 
         bug_components = Counter()
 
-        for f in files.values():
+        for f in list(files.values()):
             bug_component = f.get('BUG_COMPONENT')
             if bug_component:
                 bug_components[bug_component] += 1
@@ -889,11 +888,11 @@
         file.
         """),
 
-    'ANDROID_APK_NAME': (unicode, unicode,
+    'ANDROID_APK_NAME': (str, str,
         """The name of an Android APK file to generate.
         """),
 
-    'ANDROID_APK_PACKAGE': (unicode, unicode,
+    'ANDROID_APK_PACKAGE': (str, str,
         """The name of the Android package to generate R.java for, like org.mozilla.gecko.
         """),
 
@@ -962,7 +961,7 @@
         """),
 
     'GENERATED_FILES': (StrictOrderingOnAppendListWithFlagsFactory({
-                'script': unicode,
+                'script': str,
                 'inputs': list }), list,
         """Generic generated files.
 
@@ -1107,7 +1106,7 @@
         """Like ``OBJDIR_FILES``, with preprocessing. Use sparingly.
         """),
 
-    'FINAL_LIBRARY': (unicode, unicode,
+    'FINAL_LIBRARY': (str, str,
         """Library in which the objects of the current directory will be linked.
 
         This variable contains the name of a library, defined elsewhere with
@@ -1158,7 +1157,7 @@
         """A list of python unit tests.
         """),
 
-    'HOST_LIBRARY_NAME': (unicode, unicode,
+    'HOST_LIBRARY_NAME': (str, str,
         """Name of target library generated when cross compiling.
         """),
 
@@ -1176,7 +1175,7 @@
         libraries that link into this library via FINAL_LIBRARY.
         """),
 
-    'LIBRARY_NAME': (unicode, unicode,
+    'LIBRARY_NAME': (str, str,
         """The code name of the library generated for a directory.
 
         By default STATIC_LIBRARY_NAME and SHARED_LIBRARY_NAME take this name.
@@ -1188,7 +1187,7 @@
         ``example/components/xpcomsample.lib`` on Windows.
         """),
 
-    'SHARED_LIBRARY_NAME': (unicode, unicode,
+    'SHARED_LIBRARY_NAME': (str, str,
         """The name of the static library generated for a directory, if it needs to
         differ from the library code name.
 
@@ -1202,7 +1201,7 @@
         Implies FORCE_SHARED_LIB.
         """),
 
-    'STATIC_LIBRARY_NAME': (unicode, unicode,
+    'STATIC_LIBRARY_NAME': (str, str,
         """The name of the static library generated for a directory, if it needs to
         differ from the library code name.
 
@@ -1238,37 +1237,37 @@
 
         This variable contains a list of system libaries to link against.
         """),
-    'RCFILE': (unicode, unicode,
+    'RCFILE': (str, str,
         """The program .rc file.
 
         This variable can only be used on Windows.
         """),
 
-    'RESFILE': (unicode, unicode,
+    'RESFILE': (str, str,
         """The program .res file.
 
         This variable can only be used on Windows.
         """),
 
-    'RCINCLUDE': (unicode, unicode,
+    'RCINCLUDE': (str, str,
         """The resource script file to be included in the default .res file.
 
         This variable can only be used on Windows.
         """),
 
-    'DEFFILE': (unicode, unicode,
+    'DEFFILE': (str, str,
         """The program .def (module definition) file.
 
         This variable can only be used on Windows.
         """),
 
-    'LD_VERSION_SCRIPT': (unicode, unicode,
+    'LD_VERSION_SCRIPT': (str, str,
         """The linker version script for shared libraries.
 
         This variable can only be used on Linux.
         """),
 
-    'SYMBOLS_FILE': (Path, unicode,
+    'SYMBOLS_FILE': (Path, str,
         """A file containing a list of symbols to export from a shared library.
 
         The given file contains a list of symbols to be exported, and is
@@ -1323,7 +1322,7 @@
         ``BIN_SUFFIX``, the name will remain unchanged.
         """),
 
-    'SONAME': (unicode, unicode,
+    'SONAME': (str, str,
         """The soname of the shared object currently being linked
 
         soname is the "logical name" of a shared object, often used to provide
@@ -1379,7 +1378,7 @@
         ``GENERATED_FILES``.
         """),
 
-    'PROGRAM' : (unicode, unicode,
+    'PROGRAM' : (str, str,
         """Compiled executable name.
 
         If the configuration token ``BIN_SUFFIX`` is set, its value will be
@@ -1387,7 +1386,7 @@
         ``BIN_SUFFIX``, ``PROGRAM`` will remain unchanged.
         """),
 
-    'HOST_PROGRAM' : (unicode, unicode,
+    'HOST_PROGRAM' : (str, str,
         """Compiled host executable name.
 
         If the configuration token ``HOST_BIN_SUFFIX`` is set, its value will be
@@ -1425,7 +1424,7 @@
         files.
         """),
 
-    'XPIDL_MODULE': (unicode, unicode,
+    'XPIDL_MODULE': (str, str,
         """XPCOM Interface Definition Module Name.
 
         This is the name of the ``.xpt`` file that is created by linking
@@ -1576,14 +1575,14 @@
         """),
 
     # The following variables are used to control the target of installed files.
-    'XPI_NAME': (unicode, unicode,
+    'XPI_NAME': (str, str,
         """The name of an extension XPI to generate.
 
         When this variable is present, the results of this directory will end up
         being packaged into an extension instead of the main dist/bin results.
         """),
 
-    'DIST_SUBDIR': (unicode, unicode,
+    'DIST_SUBDIR': (str, str,
         """The name of an alternate directory to install files to.
 
         When this variable is present, the results of this directory will end up
@@ -1591,7 +1590,7 @@
         otherwise be placed.
         """),
 
-    'FINAL_TARGET': (FinalTargetValue, unicode,
+    'FINAL_TARGET': (FinalTargetValue, str,
         """The name of the directory to install targets to.
 
         The directory is relative to the top of the object directory. The
@@ -1622,7 +1621,7 @@
 
     'GYP_DIRS': (StrictOrderingOnAppendListWithFlagsFactory({
             'variables': dict,
-            'input': unicode,
+            'input': str,
             'sandbox_vars': dict,
             'non_unified_sources': StrictOrderingOnAppendList,
         }), list,
@@ -1799,7 +1798,7 @@
 }
 
 # Sanity check: we don't want any variable above to have a list as storage type.
-for name, (storage_type, input_types, docs) in VARIABLES.items():
+for name, (storage_type, input_types, docs) in list(VARIABLES.items()):
     if storage_type == list:
         raise RuntimeError('%s has a "list" storage type. Use "List" instead.'
             % name)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/data.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/data.py	(refactored)
@@ -15,7 +15,7 @@
 structures.
 """
 
-from __future__ import absolute_import, unicode_literals
+
 
 from mozbuild.util import StrictOrderingOnAppendList
 from mozpack.chrome.manifest import ManifestEntry
@@ -186,7 +186,7 @@
         self.defines = defines
 
     def get_defines(self):
-        for define, value in self.defines.iteritems():
+        for define, value in self.defines.items():
             if value is True:
                 yield('-D%s' % define)
             elif value is False:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/emitter.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/emitter.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import itertools
 import logging
@@ -120,8 +120,8 @@
         # arguments. This gross hack works around the problem until we
         # rid ourselves of 2.6.
         self.info = {}
-        for k, v in mozinfo.info.items():
-            if isinstance(k, unicode):
+        for k, v in list(mozinfo.info.items()):
+            if isinstance(k, str):
                 k = k.encode('ascii')
             self.info[k] = v
 
@@ -197,7 +197,7 @@
 
     def _emit_libs_derived(self, contexts):
         # First do FINAL_LIBRARY linkage.
-        for lib in (l for libs in self._libs.values() for l in libs):
+        for lib in (l for libs in list(self._libs.values()) for l in libs):
             if not isinstance(lib, (StaticLibrary, RustLibrary)) or not lib.link_into:
                 continue
             if lib.link_into not in self._libs:
@@ -257,12 +257,12 @@
                         lib.link_into == outerlib.basename):
                     propagate_defines(lib, defines)
 
-        for lib in (l for libs in self._libs.values() for l in libs):
+        for lib in (l for libs in list(self._libs.values()) for l in libs):
             if isinstance(lib, Library):
                 propagate_defines(lib, lib.lib_defines)
             yield lib
 
-        for obj in self._binaries.values():
+        for obj in list(self._binaries.values()):
             yield obj
 
     LIBRARY_NAME_VAR = {
@@ -321,7 +321,7 @@
                             libs[key] = l
                         if key not in libs:
                             libs[key] = l
-                candidates = libs.values()
+                candidates = list(libs.values())
                 if force_static and not candidates:
                     if dir:
                         raise SandboxValidationError(
@@ -383,9 +383,9 @@
 
     def _verify_deps(self, context, crate_dir, crate_name, dependencies, description='Dependency'):
         """Verify that a crate's dependencies all specify local paths."""
-        for dep_crate_name, values in dependencies.iteritems():
+        for dep_crate_name, values in dependencies.items():
             # A simple version number.
-            if isinstance(values, (str, unicode)):
+            if isinstance(values, str):
                 raise SandboxValidationError(
                     '%s %s of crate %s does not list a path' % (description, dep_crate_name, crate_name),
                     context)
@@ -463,7 +463,7 @@
                      ' in [profile.%s] section') % (libname, profile_name),
                     context)
 
-        dependencies = set(config.get('dependencies', {}).iterkeys())
+        dependencies = set(config.get('dependencies', {}).keys())
 
         return RustLibrary(context, libname, cargo_file, crate_type,
                            dependencies, **static_args)
@@ -738,7 +738,7 @@
         assert not gen_sources['UNIFIED_SOURCES']
 
         no_pgo = context.get('NO_PGO')
-        no_pgo_sources = [f for f, flags in all_flags.iteritems()
+        no_pgo_sources = [f for f, flags in all_flags.items()
                           if flags.no_pgo]
         if no_pgo:
             if no_pgo_sources:
@@ -765,7 +765,7 @@
 
         # The inverse of the above, mapping suffixes to their canonical suffix.
         canonicalized_suffix_map = {}
-        for suffix, alternatives in suffix_map.iteritems():
+        for suffix, alternatives in suffix_map.items():
             alternatives.add(suffix)
             for a in alternatives:
                 canonicalized_suffix_map[a] = suffix
@@ -786,7 +786,7 @@
         # a directory with mixed C and C++ source, but it's not that important.
         cxx_sources = defaultdict(bool)
 
-        for variable, (klass, gen_klass, suffixes) in varmap.items():
+        for variable, (klass, gen_klass, suffixes) in list(varmap.items()):
             allowed_suffixes = set().union(*[suffix_map[s] for s in suffixes])
 
             # First ensure that we haven't been given filetypes that we don't
@@ -812,7 +812,7 @@
                     obj = cls(*arglist)
                     yield obj
 
-        for f, flags in all_flags.iteritems():
+        for f, flags in all_flags.items():
             if flags.flags:
                 ext = mozpath.splitext(f)[1]
                 yield PerSourceFlag(context, f, flags.flags)
@@ -958,7 +958,7 @@
         for obj in self._handle_linkables(context, passthru, generated_files):
             yield obj
 
-        generated_files.update(['%s%s' % (k, self.config.substs.get('BIN_SUFFIX', '')) for k in self._binaries.keys()])
+        generated_files.update(['%s%s' % (k, self.config.substs.get('BIN_SUFFIX', '')) for k in list(self._binaries.keys())])
 
         components = []
         for var, cls in (
@@ -1055,10 +1055,10 @@
         for obj in self._process_jar_manifests(context):
             yield obj
 
-        for name, jar in context.get('JAVA_JAR_TARGETS', {}).items():
+        for name, jar in list(context.get('JAVA_JAR_TARGETS', {}).items()):
             yield ContextWrapped(context, jar)
 
-        for name, data in context.get('ANDROID_ECLIPSE_PROJECT_TARGETS', {}).items():
+        for name, data in list(context.get('ANDROID_ECLIPSE_PROJECT_TARGETS', {}).items()):
             yield ContextWrapped(context, data)
 
         if context.get('USE_YASM') is True:
@@ -1127,7 +1127,7 @@
             script = mozpath.join(mozpath.dirname(mozpath.dirname(__file__)),
                                   'action', 'process_define_files.py')
             yield GeneratedFile(context, script, 'process_define_file',
-                                unicode(path),
+                                str(path),
                                 [Path(context, path + '.in')])
 
         generated_files = context.get('GENERATED_FILES')
@@ -1170,7 +1170,7 @@
             yield GeneratedFile(context, script, method, outputs, inputs)
 
     def _process_test_manifests(self, context):
-        for prefix, info in TEST_MANIFESTS.items():
+        for prefix, info in list(TEST_MANIFESTS.items()):
             for path, manifest in context.get('%s_MANIFESTS' % prefix, []):
                 for obj in self._process_test_manifest(context, info, path, manifest):
                     yield obj
@@ -1261,7 +1261,7 @@
 
                 process_support_files(test)
 
-            for path, m_defaults in mpmanifest.manifest_defaults.items():
+            for path, m_defaults in list(mpmanifest.manifest_defaults.items()):
                 process_support_files(m_defaults)
 
             # We also copy manifests into the output directory,
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/gyp_reader.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/gyp_reader.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 import gyp
 import sys
@@ -69,7 +69,7 @@
 
 
 def encode(value):
-    if isinstance(value, unicode):
+    if isinstance(value, str):
         return value.encode('utf-8')
     return value
 
@@ -87,7 +87,7 @@
     # gyp expects plain str instead of unicode. The frontend code gives us
     # unicode strings, so convert them.
     path = encode(path)
-    str_vars = dict((name, encode(value)) for name, value in vars.items())
+    str_vars = dict((name, encode(value)) for name, value in list(vars.items()))
 
     params = {
         b'parallel': False,
@@ -222,7 +222,7 @@
                         if not f:
                             continue
                         # the result may be a string or a list.
-                        if isinstance(f, types.StringTypes):
+                        if isinstance(f, (str,)):
                             context[var].append(f)
                         else:
                             context[var].extend(f)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/mach_commands.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/mach_commands.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 from collections import defaultdict
 import os
@@ -105,13 +105,13 @@
         """
         components = defaultdict(set)
         try:
-            for p, m in self._get_files_info(paths, rev=rev).items():
+            for p, m in list(self._get_files_info(paths, rev=rev).items()):
                 components[m.get('BUG_COMPONENT')].add(p)
         except InvalidPathException as e:
             print(e.message)
             return 1
 
-        for component, files in sorted(components.items(), key=lambda x: (x is None, x)):
+        for component, files in sorted(list(components.items()), key=lambda x: (x is None, x)):
             print('%s :: %s' % (component.product, component.component) if component else 'UNKNOWN')
             for f in sorted(files):
                 print('  %s' % f)
@@ -139,7 +139,7 @@
                      help='Paths whose data to query')
     def file_info_test_deps(self, paths, rev=None):
         try:
-            for p, m in self._get_files_info(paths, rev=rev).items():
+            for p, m in list(self._get_files_info(paths, rev=rev).items()):
                 print('%s:' % mozpath.relpath(p, self.topsrcdir))
                 if m.test_files:
                     print('\tTest file patterns:')
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/reader.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/reader.py	(refactored)
@@ -16,7 +16,7 @@
 It does this by examining specific variables populated during execution.
 """
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import ast
 import inspect
@@ -80,11 +80,12 @@
 )
 
 from mozbuild.base import ExecutionSummary
+from functools import reduce
 
 
 if sys.version_info.major == 2:
-    text_type = unicode
-    type_type = types.TypeType
+    text_type = str
+    type_type = type
 else:
     text_type = str
     type_type = type
@@ -126,7 +127,7 @@
             b'JS_STANDALONE': b'1',
         })
         udict = {}
-        for k, v in self.substs.items():
+        for k, v in list(self.substs.items()):
             if isinstance(v, str):
                 udict[k.decode('utf-8')] = v.decode('utf-8')
             else:
@@ -338,7 +339,7 @@
             raise Exception('`template` is a function decorator. You must '
                 'use it as `@template` preceding a function declaration.')
 
-        name = func.func_name
+        name = func.__name__
 
         if name in self.templates:
             raise KeyError(
@@ -417,7 +418,7 @@
             klass = self._context.__class__
             self._context.__class__ = TemplateContext
             # The sandbox will do all the necessary checks for these merges.
-            for key, value in context.items():
+            for key, value in list(context.items()):
                 if isinstance(value, dict):
                     self[key].update(value)
                 elif isinstance(value, (list, HierarchicalStringList)):
@@ -434,10 +435,10 @@
 
 class TemplateFunction(object):
     def __init__(self, func, sandbox):
-        self.path = func.func_code.co_filename
-        self.name = func.func_name
-
-        code = func.func_code
+        self.path = func.__code__.co_filename
+        self.name = func.__name__
+
+        code = func.__code__
         firstlineno = code.co_firstlineno
         lines = sandbox._current_source.splitlines(True)
         lines = inspect.getblock(lines[firstlineno - 1:])
@@ -476,8 +477,8 @@
             compile(func_ast, self.path, 'exec'),
             glob,
             self.name,
-            func.func_defaults,
-            func.func_closure,
+            func.__defaults__,
+            func.__closure__,
         )
         func()
 
@@ -491,11 +492,11 @@
             '__builtins__': sandbox._builtins
         }
         func = types.FunctionType(
-            self._func.func_code,
+            self._func.__code__,
             glob,
             self.name,
-            self._func.func_defaults,
-            self._func.func_closure
+            self._func.__defaults__,
+            self._func.__closure__
         )
         sandbox.exec_function(func, args, kwargs, self.path,
                               becomes_current_path=False)
@@ -511,7 +512,7 @@
         def visit_Str(self, node):
             # String nodes we got from the AST parser are str, but we want
             # unicode literals everywhere, so transform them.
-            node.s = unicode(node.s)
+            node.s = str(node.s)
             return node
 
         def visit_Name(self, node):
@@ -644,7 +645,7 @@
 
             for l in traceback.format_exception(type(self.other), self.other,
                 self.trace):
-                s.write(unicode(l))
+                s.write(str(l))
 
         return s.getvalue()
 
@@ -794,7 +795,7 @@
             s.write('    %s\n' % inner.args[2])
             s.write('\n')
             close_matches = difflib.get_close_matches(inner.args[2],
-                                                      VARIABLES.keys(), 2)
+                                                      list(VARIABLES.keys()), 2)
             if close_matches:
                 s.write('Maybe you meant %s?\n' % ' or '.join(close_matches))
                 s.write('\n')
@@ -1196,7 +1197,7 @@
 
                 recurse_info[d][key] = dict(sandbox.metadata[key])
 
-        for path, child_metadata in recurse_info.items():
+        for path, child_metadata in list(recurse_info.items()):
             child_path = path.join('moz.build').full_path
 
             # Ensure we don't break out of the topsrcdir. We don't do realpath
@@ -1288,7 +1289,7 @@
         # There is room to improve this code (and the code in
         # _find_relevant_mozbuilds) to better handle multiple files in the same
         # directory. Bug 1136966 tracks.
-        for path, mbpaths in relevants.items():
+        for path, mbpaths in list(relevants.items()):
             path_mozbuilds[path] = [mozpath.join(topsrcdir, p) for p in mbpaths]
 
             for i, mbpath in enumerate(mbpaths[0:-1]):
@@ -1325,7 +1326,7 @@
             all_contexts.append(context)
 
         result = {}
-        for path, paths in path_mozbuilds.items():
+        for path, paths in list(path_mozbuilds.items()):
             result[path] = reduce(lambda x, y: x + y, (contexts[p] for p in paths), [])
 
         return result, all_contexts
@@ -1352,7 +1353,7 @@
 
         r = {}
 
-        for path, ctxs in paths.items():
+        for path, ctxs in list(paths.items()):
             flags = Files(Context())
 
             for ctx in ctxs:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/sandbox.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/sandbox.py	(refactored)
@@ -17,7 +17,7 @@
 user-friendly error messages in the case of errors.
 """
 
-from __future__ import absolute_import, unicode_literals
+
 
 import os
 import sys
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/common.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/common.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 from mach.logging import LoggingManager
 
@@ -36,7 +36,7 @@
         }, **extra_substs)
 
         self.substs_unicode = ReadOnlyDict({k.decode('utf-8'): v.decode('utf-8',
-            'replace') for k, v in self.substs.items()})
+            'replace') for k, v in list(self.substs.items())})
 
         self.defines = self.substs
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_base.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_base.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import json
 import os
@@ -12,7 +12,7 @@
 import tempfile
 import unittest
 
-from cStringIO import StringIO
+from io import StringIO
 from mozfile.mozfile import NamedTemporaryFile
 
 from mozunit import main
@@ -93,7 +93,7 @@
             mozconfig = os.path.join(d, 'mozconfig')
             with open(mozconfig, 'wt') as fh:
                 fh.write('mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/foo/@CONFIG_GUESS@')
-            print('Wrote mozconfig %s' % mozconfig)
+            print(('Wrote mozconfig %s' % mozconfig))
 
             topobjdir = os.path.join(d, 'foo', guess)
             os.makedirs(topobjdir)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_containers.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_containers.py	(refactored)
@@ -152,7 +152,7 @@
 
         self.assertEqual(test['foo'], 1)
 
-        self.assertEqual(test.keys(), ['foo', 'bar' ])
+        self.assertEqual(list(test.keys()), ['foo', 'bar' ])
 
     def test_defaults(self):
         test = OrderedDefaultDict(bool, {'foo': 1 })
@@ -161,7 +161,7 @@
 
         self.assertEqual(test['qux'], False)
 
-        self.assertEqual(test.keys(), ['foo', 'qux' ])
+        self.assertEqual(list(test.keys()), ['foo', 'qux' ])
 
 
 class TestKeyedDefaultDict(unittest.TestCase):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_dotproperties.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_dotproperties.py	(refactored)
@@ -1,11 +1,11 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import unicode_literals
+
 
 import os
 import unittest
 
-from StringIO import StringIO
+from io import StringIO
 
 import mozpack.path as mozpath
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_expression.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_expression.py	(refactored)
@@ -25,8 +25,8 @@
 
   def test_in(self):
     """test 'var in context' to not fall for fallback"""
-    self.assert_('FAIL' in self.c)
-    self.assert_('PASS' not in self.c)
+    self.assertTrue('FAIL' in self.c)
+    self.assertTrue('PASS' not in self.c)
 
 class TestExpression(unittest.TestCase):
   """
@@ -48,16 +48,16 @@
 
   def test_not(self):
     """Test for the ! operator"""
-    self.assert_(Expression('!0').evaluate(self.c))
-    self.assert_(not Expression('!1').evaluate(self.c))
+    self.assertTrue(Expression('!0').evaluate(self.c))
+    self.assertTrue(not Expression('!1').evaluate(self.c))
 
   def test_equals(self):
     """ Test for the == operator"""
-    self.assert_(Expression('FAIL == PASS').evaluate(self.c))
+    self.assertTrue(Expression('FAIL == PASS').evaluate(self.c))
 
   def test_notequals(self):
     """ Test for the != operator"""
-    self.assert_(Expression('FAIL != 1').evaluate(self.c))
+    self.assertTrue(Expression('FAIL != 1').evaluate(self.c))
 
   def test_logical_and(self):
     """ Test for the && operator"""
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_jarmaker.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_jarmaker.py	(refactored)
@@ -2,14 +2,14 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import print_function
+
 import unittest
 
 import os, sys, os.path, time, inspect
 from filecmp import dircmp
 from tempfile import mkdtemp
 from shutil import rmtree, copy2
-from StringIO import StringIO
+from io import StringIO
 from zipfile import ZipFile
 import mozunit
 
@@ -117,12 +117,12 @@
     """Helper to report rich results on difference between two directories.
     """
     def _fillDiff(self, dc, rv, basepath="{0}"):
-        rv['right_only'] += map(lambda l: basepath.format(l), dc.right_only)
-        rv['left_only'] += map(lambda l: basepath.format(l), dc.left_only)
-        rv['diff_files'] += map(lambda l: basepath.format(l), dc.diff_files)
-        rv['funny'] += map(lambda l: basepath.format(l), dc.common_funny)
-        rv['funny'] += map(lambda l: basepath.format(l), dc.funny_files)
-        for subdir, _dc in dc.subdirs.iteritems():
+        rv['right_only'] += [basepath.format(l) for l in dc.right_only]
+        rv['left_only'] += [basepath.format(l) for l in dc.left_only]
+        rv['diff_files'] += [basepath.format(l) for l in dc.diff_files]
+        rv['funny'] += [basepath.format(l) for l in dc.common_funny]
+        rv['funny'] += [basepath.format(l) for l in dc.funny_files]
+        for subdir, _dc in dc.subdirs.items():
             self._fillDiff(_dc, rv, basepath.format(subdir + "/{0}"))
     def allResults(self, left, right):
         rv = {'right_only':[], 'left_only':[],
@@ -295,7 +295,7 @@
             ('hoge', 'foo', '2'): ('qux', 'foo', '2'),
             ('hoge', 'baz'): ('qux', 'baz'),
         }
-        for dest, src in expected_symlinks.iteritems():
+        for dest, src in expected_symlinks.items():
             srcpath = os.path.join(self.srcdir, *src)
             destpath = os.path.join(self.builddir, 'chrome', 'test', 'dir',
                                     *dest)
@@ -317,7 +317,7 @@
     def test_en_US(self):
         jm = self.jm
         jm.makeJar(self.fake_empty_file, '/NO_OUTPUT_REQUIRED')
-        self.assertEquals(jm.localedirs,
+        self.assertEqual(jm.localedirs,
                           [
                             os.path.join(os.path.abspath('/TOPSOURCEDIR'),
                                          'browser/locales', 'en-US')
@@ -326,13 +326,13 @@
         jm = self.jm
         jm.l10nbase = '/L10N_BASE'
         jm.makeJar(self.fake_empty_file, '/NO_OUTPUT_REQUIRED')
-        self.assertEquals(jm.localedirs, [os.path.join('/L10N_BASE', 'browser')])
+        self.assertEqual(jm.localedirs, [os.path.join('/L10N_BASE', 'browser')])
     def test_l10n_merge(self):
         jm = self.jm
         jm.l10nbase = '/L10N_BASE'
         jm.l10nmerge = '/L10N_MERGE'
         jm.makeJar(self.fake_empty_file, '/NO_OUTPUT_REQUIRED')
-        self.assertEquals(jm.localedirs,
+        self.assertEqual(jm.localedirs,
                           [os.path.join('/L10N_MERGE', 'browser'),
                            os.path.join('/L10N_BASE', 'browser'),
                            os.path.join(os.path.abspath('/TOPSOURCEDIR'),
@@ -346,7 +346,7 @@
 ''')
         jarcontents.name = 'override.mn'
         jm.makeJar(jarcontents, '/NO_OUTPUT_REQUIRED')
-        self.assertEquals(jm.localedirs,
+        self.assertEqual(jm.localedirs,
                           [
                             os.path.join(os.path.abspath('/TOPSOURCEDIR'),
                                          'dom/locales', 'en-US')
@@ -360,7 +360,7 @@
 ''')
         jarcontents.name = 'override.mn'
         jm.makeJar(jarcontents, '/NO_OUTPUT_REQUIRED')
-        self.assertEquals(jm.localedirs, [os.path.join('/L10N_BASE', 'dom')])
+        self.assertEqual(jm.localedirs, [os.path.join('/L10N_BASE', 'dom')])
 
 
 if __name__ == '__main__':
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_line_endings.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_line_endings.py	(refactored)
@@ -1,6 +1,6 @@
 import unittest
 
-from StringIO import StringIO
+from io import StringIO
 import os
 import sys
 import os.path
@@ -30,17 +30,17 @@
   def testMac(self):
     self.createFile(['\x0D']*3)
     self.pp.do_include(self.tempnam)
-    self.assertEquals(self.pp.out.getvalue(), 'a\nb\nc\n')
+    self.assertEqual(self.pp.out.getvalue(), 'a\nb\nc\n')
 
   def testUnix(self):
     self.createFile(['\x0A']*3)
     self.pp.do_include(self.tempnam)
-    self.assertEquals(self.pp.out.getvalue(), 'a\nb\nc\n')
+    self.assertEqual(self.pp.out.getvalue(), 'a\nb\nc\n')
 
   def testWindows(self):
     self.createFile(['\x0D\x0A']*3)
     self.pp.do_include(self.tempnam)
-    self.assertEquals(self.pp.out.getvalue(), 'a\nb\nc\n')
+    self.assertEqual(self.pp.out.getvalue(), 'a\nb\nc\n')
 
 if __name__ == '__main__':
   mozunit.main()
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_makeutil.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_makeutil.py	(refactored)
@@ -11,7 +11,7 @@
 from mozunit import main
 import os
 import unittest
-from StringIO import StringIO
+from io import StringIO
 
 
 class TestMakefile(unittest.TestCase):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_mozconfig.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_mozconfig.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import os
 import unittest
@@ -480,9 +480,9 @@
 
             self.assertTrue(e.exception.message.startswith(
                 'Evaluation of your mozconfig exited with an error'))
-            self.assertEquals(e.exception.path,
+            self.assertEqual(e.exception.path,
                 mozconfig.name.replace(os.sep, '/'))
-            self.assertEquals(e.exception.output, ['hello world'])
+            self.assertEqual(e.exception.output, ['hello world'])
 
 
 if __name__ == '__main__':
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_mozinfo.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_mozinfo.py	(refactored)
@@ -8,7 +8,7 @@
 import tempfile
 import unittest
 
-from StringIO import StringIO
+from io import StringIO
 
 import mozunit
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_preprocessor.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_preprocessor.py	(refactored)
@@ -4,7 +4,7 @@
 
 import unittest
 
-from StringIO import StringIO
+from io import StringIO
 import os
 import shutil
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_pythonutil.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_pythonutil.py	(refactored)
@@ -12,7 +12,7 @@
     def test_iter_modules_in_path(self):
         mozbuild_path = os.path.normcase(os.path.dirname(os.path.dirname(__file__)))
         paths = list(iter_modules_in_path(mozbuild_path))
-        self.assertEquals(sorted(paths), [
+        self.assertEqual(sorted(paths), [
             os.path.join(os.path.abspath(mozbuild_path), '__init__.py'),
             os.path.join(os.path.abspath(mozbuild_path), 'pythonutil.py'),
             os.path.join(os.path.abspath(mozbuild_path), 'test', 'test_pythonutil.py'),
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_testing.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_testing.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
-
-import cPickle as pickle
+
+
+import pickle as pickle
 import os
 import shutil
 import tempfile
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_util.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/test_util.py	(refactored)
@@ -3,7 +3,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import itertools
 import hashlib
@@ -110,7 +110,7 @@
             '''
             def __call__(self, name, mode):
                 if 'w' in mode:
-                    raise Exception, 'Unexpected open with write mode'
+                    raise Exception('Unexpected open with write mode')
                 return MockedOpen.__call__(self, name, mode)
 
         with MyMockedOpen({'file': 'content'}):
@@ -432,7 +432,7 @@
         self.assertEqual(len(l), 0)
         original = ['a', 'b', 'c']
         l = ListWithAction(['a', 'b', 'c'], action=self.action)
-        expected = map(self.action, original)
+        expected = list(map(self.action, original))
         self.assertSameList(expected, l)
 
         with self.assertRaises(ValueError):
@@ -445,7 +445,7 @@
         l = ListWithAction(action=self.action)
         original = ['a', 'b']
         l.extend(original)
-        expected = map(self.action, original)
+        expected = list(map(self.action, original))
         self.assertSameList(expected, l)
 
         with self.assertRaises(ValueError):
@@ -455,7 +455,7 @@
         l = ListWithAction(action=self.action)
         original = ['a', 'b']
         l[:] = original
-        expected = map(self.action, original)
+        expected = list(map(self.action, original))
         self.assertSameList(expected, l)
 
         with self.assertRaises(ValueError):
@@ -465,7 +465,7 @@
         l = ListWithAction(action=self.action)
         original = ['a', 'b']
         l2 = l + original
-        expected = map(self.action, original)
+        expected = list(map(self.action, original))
         self.assertSameList(expected, l2)
 
         with self.assertRaises(ValueError):
@@ -475,7 +475,7 @@
         l = ListWithAction(action=self.action)
         original = ['a', 'b']
         l += original
-        expected = map(self.action, original)
+        expected = list(map(self.action, original))
         self.assertSameList(expected, l)
 
         with self.assertRaises(ValueError):
@@ -524,7 +524,7 @@
 
     def test_strict_ordering_on_append_list_with_flags_factory_extend(self):
         FooList = StrictOrderingOnAppendListWithFlagsFactory({
-            'foo': bool, 'bar': unicode
+            'foo': bool, 'bar': str
         })
         foo = FooList(['a', 'b', 'c'])
         foo['a'].foo = True
@@ -532,7 +532,7 @@
 
         # Don't allow extending lists with different flag definitions.
         BarList = StrictOrderingOnAppendListWithFlagsFactory({
-            'foo': unicode, 'baz': bool
+            'foo': str, 'baz': bool
         })
         bar = BarList(['d', 'e', 'f'])
         bar['d'].foo = 'foo'
@@ -752,9 +752,9 @@
 
 class TypedTestStrictOrderingOnAppendList(unittest.TestCase):
     def test_init(self):
-        class Unicode(unicode):
+        class Unicode(str):
             def __init__(self, other):
-                if not isinstance(other, unicode):
+                if not isinstance(other, str):
                     raise ValueError()
                 super(Unicode, self).__init__(other)
 
@@ -776,14 +776,14 @@
 
 class TestTypedNamedTuple(unittest.TestCase):
     def test_simple(self):
-        FooBar = TypedNamedTuple('FooBar', [('foo', unicode), ('bar', int)])
+        FooBar = TypedNamedTuple('FooBar', [('foo', str), ('bar', int)])
 
         t = FooBar(foo='foo', bar=2)
-        self.assertEquals(type(t), FooBar)
-        self.assertEquals(t.foo, 'foo')
-        self.assertEquals(t.bar, 2)
-        self.assertEquals(t[0], 'foo')
-        self.assertEquals(t[1], 2)
+        self.assertEqual(type(t), FooBar)
+        self.assertEqual(t.foo, 'foo')
+        self.assertEqual(t.bar, 2)
+        self.assertEqual(t[0], 'foo')
+        self.assertEqual(t[1], 2)
 
         FooBar('foo', 2)
 
@@ -796,7 +796,7 @@
         # arguments.
         t1 = ('foo', 3)
         t2 = FooBar(t1)
-        self.assertEquals(type(t2), FooBar)
+        self.assertEqual(type(t2), FooBar)
         self.assertEqual(FooBar(t1), FooBar('foo', 3))
 
 
@@ -871,18 +871,18 @@
         CompilerType = EnumString.subclass('msvc', 'gcc', 'clang', 'clang-cl')
 
         type = CompilerType('msvc')
-        self.assertEquals(type, 'msvc')
-        self.assertNotEquals(type, 'gcc')
-        self.assertNotEquals(type, 'clang')
-        self.assertNotEquals(type, 'clang-cl')
+        self.assertEqual(type, 'msvc')
+        self.assertNotEqual(type, 'gcc')
+        self.assertNotEqual(type, 'clang')
+        self.assertNotEqual(type, 'clang-cl')
         self.assertIn(type, ('msvc', 'clang-cl'))
         self.assertNotIn(type, ('gcc', 'clang'))
 
         with self.assertRaises(EnumStringComparisonError):
-            self.assertEquals(type, 'foo')
+            self.assertEqual(type, 'foo')
 
         with self.assertRaises(EnumStringComparisonError):
-            self.assertNotEquals(type, 'foo')
+            self.assertNotEqual(type, 'foo')
 
         with self.assertRaises(EnumStringComparisonError):
             self.assertIn(type, ('foo', 'gcc'))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/action/test_buildlist.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/action/test_buildlist.py	(refactored)
@@ -38,11 +38,11 @@
     lines = [line.rstrip() for line in f.readlines()]
     f.close()
     for line in lines:
-      self.assert_(len(l) > 0,
+      self.assertTrue(len(l) > 0,
                    "ran out of expected lines! (expected '{0}', got '{1}')"
                    .format(l, lines))
       self.assertEqual(line, l.pop(0))
-    self.assert_(len(l) == 0, 
+    self.assertTrue(len(l) == 0, 
                  "not enough lines in file! (expected '{0}',"
                  " got '{1}'".format(l, lines))
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/action/test_generate_browsersearch.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/action/test_generate_browsersearch.py	(refactored)
@@ -3,7 +3,7 @@
 # Any copyright is dedicated to the Public Domain.
 # http://creativecommons.org/publicdomain/zero/1.0/
 
-from __future__ import unicode_literals
+
 
 import json
 import os
@@ -43,8 +43,8 @@
 
     def test_valid_unicode(self):
         o = self._test_one('valid-zh-CN')
-        self.assertEquals(o['default'], '百度')
-        self.assertEquals(o['engines'], ['百度', 'Google'])
+        self.assertEqual(o['default'], '百度')
+        self.assertEqual(o['engines'], ['百度', 'Google'])
 
     def test_invalid_unicode(self):
         with self.assertRaises(UnicodeDecodeError):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/action/test_package_fennec_apk.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/action/test_package_fennec_apk.py	(refactored)
@@ -3,7 +3,7 @@
 # Any copyright is dedicated to the Public Domain.
 # http://creativecommons.org/publicdomain/zero/1.0/
 
-from __future__ import unicode_literals
+
 
 import os
 import unittest
@@ -41,14 +41,14 @@
                          root_files=[data('root_file.txt')])
 
         # omni.ja ends up in assets/omni.ja.
-        self.assertEquals(jarrer['assets/omni.ja'].open().read().strip(), 'omni.ja')
+        self.assertEqual(jarrer['assets/omni.ja'].open().read().strip(), 'omni.ja')
 
         # Everything else is in place.
         for name in ('classes.dex',
                      'assets/asset.txt',
                      'lib/lib.txt',
                      'root_file.txt'):
-            self.assertEquals(jarrer[name].open().read().strip(), name)
+            self.assertEqual(jarrer[name].open().read().strip(), name)
 
     def test_inputs(self):
         # Language repacks take updated resources from an ap_ and pack them
@@ -57,8 +57,8 @@
         # overrides the first.
         jarrer = package(inputs=[data('input2.apk'), data('input1.ap_')])
 
-        files1 = JarReader(data('input1.ap_')).entries.keys()
-        files2 = JarReader(data('input2.apk')).entries.keys()
+        files1 = list(JarReader(data('input1.ap_')).entries.keys())
+        files2 = list(JarReader(data('input2.apk')).entries.keys())
         for name in files2:
             self.assertTrue(name in files1 or
                             jarrer[name].open().read().startswith('input2/'))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/common.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/common.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import os
 import unittest
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_android_eclipse.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_android_eclipse.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import json
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_build.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_build.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals, print_function
+
 
 import buildconfig
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_configenvironment.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_configenvironment.py	(refactored)
@@ -3,7 +3,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 import os, posixpath
-from StringIO import StringIO
+from io import StringIO
 import unittest
 from mozunit import main, MockedOpen
 
@@ -29,7 +29,7 @@
             self.substs = ReadOnlyDict(d)
 
             d = dict(self.substs_unicode)
-            d[u'top_srcdir'] = top_srcdir.decode('utf-8')
+            d['top_srcdir'] = top_srcdir.decode('utf-8')
             self.substs_unicode = ReadOnlyDict(d)
 
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_recursivemake.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_recursivemake.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
-
-import cPickle as pickle
+
+
+import pickle as pickle
 import json
 import os
 import unittest
@@ -331,7 +331,7 @@
             ],
         }
 
-        for var, val in expected.items():
+        for var, val in list(expected.items()):
             # print("test_variable_passthru[%s]" % (var))
             found = [str for str in lines if str.startswith(var)]
             self.assertEqual(found, val)
@@ -370,7 +370,7 @@
             ],
         }
 
-        for var, val in expected.items():
+        for var, val in list(expected.items()):
             found = [str for str in lines if str.startswith(var)]
             self.assertEqual(found, val)
 
@@ -544,7 +544,7 @@
 
         # This is not the most robust test in the world, but it gets the job
         # done.
-        entries = [e for e in m._dests.keys() if '**' in e]
+        entries = [e for e in list(m._dests.keys()) if '**' in e]
         self.assertEqual(len(entries), 1)
         self.assertIn('support/**', entries[0])
 
@@ -562,7 +562,7 @@
                          set(['child/test_sub.js',
                               'child/data/**',
                               'child/another-file.sjs']))
-        for key in test_installs.keys():
+        for key in list(test_installs.keys()):
             self.assertIn(key, test_installs)
 
         test_files_manifest = mozpath.join(env.topobjdir,
@@ -576,7 +576,7 @@
         # Then, synthesize one from the test-installs.pkl file. This should
         # allow us to re-create a subset of the above.
         synthesized_manifest = InstallManifest()
-        for item, installs in test_installs.items():
+        for item, installs in list(test_installs.items()):
             for install_info in installs:
                 if len(install_info) == 3:
                     synthesized_manifest.add_pattern_symlink(*install_info)
@@ -584,7 +584,7 @@
                     synthesized_manifest.add_symlink(*install_info)
 
         self.assertEqual(len(synthesized_manifest), 3)
-        for item, info in synthesized_manifest._dests.items():
+        for item, info in list(synthesized_manifest._dests.items()):
             self.assertIn(item, m)
             self.assertEqual(info, m._dests[item])
 
@@ -758,7 +758,7 @@
         expected[mozpath.join(env.topobjdir, 'final-target')] = [
             'FINAL_TARGET = $(DEPTH)/random-final-target'
         ]
-        for key, expected_rules in expected.iteritems():
+        for key, expected_rules in expected.items():
             backend_path = mozpath.join(key, 'backend.mk')
             lines = [l.strip() for l in open(backend_path, 'rt').readlines()[2:]]
             found = [str for str in lines if
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_visualstudio.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/backend/test_visualstudio.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 from xml.dom.minidom import parse
 import os
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/common.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/common.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import copy
 import errno
@@ -16,7 +16,7 @@
 from mozbuild.util import ReadOnlyNamespace
 from mozpack import path as mozpath
 
-from StringIO import StringIO
+from io import StringIO
 from which import WhichError
 
 from buildconfig import (
@@ -78,10 +78,10 @@
         self._search_path = environ.get('PATH', '').split(os.pathsep)
 
         self._subprocess_paths = {
-            mozpath.abspath(k): v for k, v in paths.iteritems() if v
+            mozpath.abspath(k): v for k, v in paths.items() if v
         }
 
-        paths = paths.keys()
+        paths = list(paths.keys())
 
         environ = dict(environ)
         if 'CONFIG_SHELL' not in environ:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/lint.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/lint.py	(refactored)
@@ -2,11 +2,11 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import os
 import unittest
-from StringIO import StringIO
+from io import StringIO
 from mozunit import main
 from buildconfig import (
     topobjdir,
@@ -42,9 +42,7 @@
         return type.__new__(mcs, name, bases, attrs)
 
 
-class Lint(unittest.TestCase):
-    __metaclass__ = LintMeta
-
+class Lint(unittest.TestCase, metaclass=LintMeta):
     def setUp(self):
         self._curdir = os.getcwd()
         os.chdir(topobjdir)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_checks_configure.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_checks_configure.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
-
-from StringIO import StringIO
+
+
+from io import StringIO
 import os
 import sys
 import textwrap
@@ -447,7 +447,7 @@
             checking for a... %s
         ''' % self.OTHER_A))
 
-        dirs = map(mozpath.dirname, (self.OTHER_A, self.KNOWN_A))
+        dirs = list(map(mozpath.dirname, (self.OTHER_A, self.KNOWN_A)))
         config, out, status = self.get_result(textwrap.dedent('''\
             check_prog("A", ("known-a",), paths=["%s"])
         ''' % os.pathsep.join(dirs)))
@@ -457,7 +457,7 @@
             checking for a... %s
         ''' % self.OTHER_A))
 
-        dirs = map(mozpath.dirname, (self.KNOWN_A, self.KNOWN_B))
+        dirs = list(map(mozpath.dirname, (self.KNOWN_A, self.KNOWN_B)))
         config, out, status = self.get_result(textwrap.dedent('''\
             check_prog("A", ("known-a",), paths=["%s", "%s"])
         ''' % (os.pathsep.join(dirs), self.OTHER_A)))
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_compile_checks.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_compile_checks.py	(refactored)
@@ -2,14 +2,14 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import os
 import textwrap
 import unittest
 import mozpack.path as mozpath
 
-from StringIO import StringIO
+from io import StringIO
 
 from buildconfig import topsrcdir
 from common import ConfigureTestSandbox
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_configure.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_configure.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
-
-from StringIO import StringIO
+
+
+from io import StringIO
 import os
 import sys
 import textwrap
@@ -43,7 +43,7 @@
 
         if '--help' in options:
             return out.getvalue(), config
-        self.assertEquals('', out.getvalue())
+        self.assertEqual('', out.getvalue())
         return config
 
     def moz_configure(self, source):
@@ -55,7 +55,7 @@
     def test_defaults(self):
         config = self.get_config()
         self.maxDiff = None
-        self.assertEquals({
+        self.assertEqual({
             'CHOICES': NegativeOptionValue(),
             'DEFAULTED': PositiveOptionValue(('not-simple',)),
             'IS_GCC': NegativeOptionValue(),
@@ -71,9 +71,9 @@
     def test_help(self):
         help, config = self.get_config(['--help'], prog='configure')
 
-        self.assertEquals({}, config)
+        self.assertEqual({}, config)
         self.maxDiff = None
-        self.assertEquals(
+        self.assertEqual(
             'Usage: configure [options]\n'
             '\n'
             'Options: [defaults in brackets after descriptions]\n'
@@ -109,7 +109,7 @@
         ):
             self.assertNotIn('ENABLED_SIMPLE', config)
             self.assertIn('SIMPLE', config)
-            self.assertEquals(NegativeOptionValue(), config['SIMPLE'])
+            self.assertEqual(NegativeOptionValue(), config['SIMPLE'])
 
         for config in (
                 self.get_config(['--enable-simple']),
@@ -117,7 +117,7 @@
         ):
             self.assertIn('ENABLED_SIMPLE', config)
             self.assertIn('SIMPLE', config)
-            self.assertEquals(PositiveOptionValue(), config['SIMPLE'])
+            self.assertEqual(PositiveOptionValue(), config['SIMPLE'])
             self.assertIs(config['SIMPLE'], config['ENABLED_SIMPLE'])
 
         # --enable-simple doesn't take values.
@@ -135,7 +135,7 @@
                                 env={'MOZ_WITH_ENV': '1'}),
         ):
             self.assertIn('WITH_ENV', config)
-            self.assertEquals(NegativeOptionValue(), config['WITH_ENV'])
+            self.assertEqual(NegativeOptionValue(), config['WITH_ENV'])
 
         for config in (
                 self.get_config(['--enable-with-env']),
@@ -145,7 +145,7 @@
                                 env={'MOZ_WITH_ENV': ''}),
         ):
             self.assertIn('WITH_ENV', config)
-            self.assertEquals(PositiveOptionValue(), config['WITH_ENV'])
+            self.assertEqual(PositiveOptionValue(), config['WITH_ENV'])
 
         with self.assertRaises(InvalidOptionError):
             self.get_config(['--enable-with-env=value'])
@@ -160,23 +160,23 @@
             self.get_config(['--enable-values', '--disable-values']),
         ):
             self.assertIn(name, config)
-            self.assertEquals(NegativeOptionValue(), config[name])
+            self.assertEqual(NegativeOptionValue(), config[name])
 
         for config in (
             self.get_config(['--enable-values']),
             self.get_config(['--disable-values', '--enable-values']),
         ):
             self.assertIn(name, config)
-            self.assertEquals(PositiveOptionValue(), config[name])
+            self.assertEqual(PositiveOptionValue(), config[name])
 
         config = self.get_config(['--enable-values=foo'])
         self.assertIn(name, config)
-        self.assertEquals(PositiveOptionValue(('foo',)), config[name])
+        self.assertEqual(PositiveOptionValue(('foo',)), config[name])
 
         config = self.get_config(['--enable-values=foo,bar'])
         self.assertIn(name, config)
         self.assertTrue(config[name])
-        self.assertEquals(PositiveOptionValue(('foo', 'bar')), config[name])
+        self.assertEqual(PositiveOptionValue(('foo', 'bar')), config[name])
 
     def test_values2(self):
         self.test_values('VALUES2')
@@ -187,12 +187,12 @@
     def test_returned_default(self):
         config = self.get_config(['--enable-simple'])
         self.assertIn('DEFAULTED', config)
-        self.assertEquals(
+        self.assertEqual(
             PositiveOptionValue(('simple',)), config['DEFAULTED'])
 
         config = self.get_config(['--disable-simple'])
         self.assertIn('DEFAULTED', config)
-        self.assertEquals(
+        self.assertEqual(
             PositiveOptionValue(('not-simple',)), config['DEFAULTED'])
 
     def test_returned_choices(self):
@@ -200,13 +200,13 @@
             config = self.get_config(
                 ['--enable-values=alpha', '--returned-choices=%s' % val])
             self.assertIn('CHOICES', config)
-            self.assertEquals(PositiveOptionValue((val,)), config['CHOICES'])
+            self.assertEqual(PositiveOptionValue((val,)), config['CHOICES'])
 
         for val in ('0', '1', '2'):
             config = self.get_config(
                 ['--enable-values=numeric', '--returned-choices=%s' % val])
             self.assertIn('CHOICES', config)
-            self.assertEquals(PositiveOptionValue((val,)), config['CHOICES'])
+            self.assertEqual(PositiveOptionValue((val,)), config['CHOICES'])
 
         with self.assertRaises(InvalidOptionError):
             self.get_config(['--enable-values=numeric',
@@ -218,12 +218,12 @@
     def test_included(self):
         config = self.get_config(env={'CC': 'gcc'})
         self.assertIn('IS_GCC', config)
-        self.assertEquals(config['IS_GCC'], True)
+        self.assertEqual(config['IS_GCC'], True)
 
         config = self.get_config(
             ['--enable-include=extra.configure', '--extra'])
         self.assertIn('EXTRA', config)
-        self.assertEquals(PositiveOptionValue(), config['EXTRA'])
+        self.assertEqual(PositiveOptionValue(), config['EXTRA'])
 
         with self.assertRaises(InvalidOptionError):
             self.get_config(['--extra'])
@@ -231,7 +231,7 @@
     def test_template(self):
         config = self.get_config(env={'CC': 'gcc'})
         self.assertIn('CFLAGS', config)
-        self.assertEquals(config['CFLAGS'], ['-Werror=foobar'])
+        self.assertEqual(config['CFLAGS'], ['-Werror=foobar'])
 
         config = self.get_config(env={'CC': 'clang'})
         self.assertNotIn('CFLAGS', config)
@@ -288,7 +288,7 @@
             sandbox
         )
 
-        import __builtin__
+        import builtins
         self.assertIs(sandbox['foo'](), __builtin__)
 
         exec_(textwrap.dedent('''
@@ -300,7 +300,7 @@
         )
 
         f = sandbox['foo']()
-        self.assertEquals(f.name, os.devnull)
+        self.assertEqual(f.name, os.devnull)
         f.close()
 
         # This unlocks the sandbox
@@ -336,8 +336,8 @@
         self.assertIs(sandbox['foo'](), sandbox)
 
         # Nothing leaked from the function being executed
-        self.assertEquals(sandbox.keys(), ['__builtins__', 'foo'])
-        self.assertEquals(sandbox['__builtins__'], ConfigureSandbox.BUILTINS)
+        self.assertEqual(list(sandbox.keys()), ['__builtins__', 'foo'])
+        self.assertEqual(sandbox['__builtins__'], ConfigureSandbox.BUILTINS)
 
         exec_(textwrap.dedent('''
             @template
@@ -354,7 +354,7 @@
         with self.assertRaises(NameError) as e:
             sandbox._depends[sandbox['bar']].result
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "global name 'sys' is not defined")
 
     def test_apply_imports(self):
@@ -380,28 +380,28 @@
             sandbox
         )
 
-        self.assertEquals(len(imports), 1)
+        self.assertEqual(len(imports), 1)
 
     def test_os_path(self):
         config = self.get_config(['--with-imports=%s' % __file__])
         self.assertIn('HAS_ABSPATH', config)
-        self.assertEquals(config['HAS_ABSPATH'], True)
+        self.assertEqual(config['HAS_ABSPATH'], True)
         self.assertIn('HAS_GETATIME', config)
-        self.assertEquals(config['HAS_GETATIME'], True)
+        self.assertEqual(config['HAS_GETATIME'], True)
         self.assertIn('HAS_GETATIME2', config)
-        self.assertEquals(config['HAS_GETATIME2'], False)
+        self.assertEqual(config['HAS_GETATIME2'], False)
 
     def test_template_call(self):
         config = self.get_config(env={'CC': 'gcc'})
         self.assertIn('TEMPLATE_VALUE', config)
-        self.assertEquals(config['TEMPLATE_VALUE'], 42)
+        self.assertEqual(config['TEMPLATE_VALUE'], 42)
         self.assertIn('TEMPLATE_VALUE_2', config)
-        self.assertEquals(config['TEMPLATE_VALUE_2'], 21)
+        self.assertEqual(config['TEMPLATE_VALUE_2'], 21)
 
     def test_template_imports(self):
         config = self.get_config(['--enable-imports-in-template'])
         self.assertIn('PLATFORM', config)
-        self.assertEquals(config['PLATFORM'], sys.platform)
+        self.assertEqual(config['PLATFORM'], sys.platform)
 
     def test_decorators(self):
         config = {}
@@ -419,27 +419,27 @@
             return self.get_config(*args, configure='set_config.configure')
 
         help, config = get_config(['--help'])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config(['--set-foo'])
         self.assertIn('FOO', config)
-        self.assertEquals(config['FOO'], True)
+        self.assertEqual(config['FOO'], True)
 
         config = get_config(['--set-bar'])
         self.assertNotIn('FOO', config)
         self.assertIn('BAR', config)
-        self.assertEquals(config['BAR'], True)
+        self.assertEqual(config['BAR'], True)
 
         config = get_config(['--set-value=qux'])
         self.assertIn('VALUE', config)
-        self.assertEquals(config['VALUE'], 'qux')
+        self.assertEqual(config['VALUE'], 'qux')
 
         config = get_config(['--set-name=hoge'])
         self.assertIn('hoge', config)
-        self.assertEquals(config['hoge'], True)
+        self.assertEqual(config['hoge'], True)
 
         config = get_config([])
-        self.assertEquals(config, {'BAR': False})
+        self.assertEqual(config, {'BAR': False})
 
         with self.assertRaises(ConfigureError):
             # Both --set-foo and --set-name=FOO are going to try to
@@ -454,11 +454,11 @@
             set_config('QUX', 'qux', when='--with-qux')
         '''):
             config = self.get_config()
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': 'foo',
             })
             config = self.get_config(['--with-qux'])
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': 'foo',
                 'QUX': 'qux',
             })
@@ -468,27 +468,27 @@
             return self.get_config(*args, configure='set_define.configure')
 
         help, config = get_config(['--help'])
-        self.assertEquals(config, {'DEFINES': {}})
+        self.assertEqual(config, {'DEFINES': {}})
 
         config = get_config(['--set-foo'])
         self.assertIn('FOO', config['DEFINES'])
-        self.assertEquals(config['DEFINES']['FOO'], True)
+        self.assertEqual(config['DEFINES']['FOO'], True)
 
         config = get_config(['--set-bar'])
         self.assertNotIn('FOO', config['DEFINES'])
         self.assertIn('BAR', config['DEFINES'])
-        self.assertEquals(config['DEFINES']['BAR'], True)
+        self.assertEqual(config['DEFINES']['BAR'], True)
 
         config = get_config(['--set-value=qux'])
         self.assertIn('VALUE', config['DEFINES'])
-        self.assertEquals(config['DEFINES']['VALUE'], 'qux')
+        self.assertEqual(config['DEFINES']['VALUE'], 'qux')
 
         config = get_config(['--set-name=hoge'])
         self.assertIn('hoge', config['DEFINES'])
-        self.assertEquals(config['DEFINES']['hoge'], True)
+        self.assertEqual(config['DEFINES']['hoge'], True)
 
         config = get_config([])
-        self.assertEquals(config['DEFINES'], {'BAR': False})
+        self.assertEqual(config['DEFINES'], {'BAR': False})
 
         with self.assertRaises(ConfigureError):
             # Both --set-foo and --set-name=FOO are going to try to
@@ -503,11 +503,11 @@
             set_define('QUX', 'qux', when='--with-qux')
         '''):
             config = self.get_config()
-            self.assertEquals(config['DEFINES'], {
+            self.assertEqual(config['DEFINES'], {
                 'FOO': 'foo',
             })
             config = self.get_config(['--with-qux'])
-            self.assertEquals(config['DEFINES'], {
+            self.assertEqual(config['DEFINES'], {
                 'FOO': 'foo',
                 'QUX': 'qux',
             })
@@ -518,19 +518,19 @@
                 *args, configure='imply_option/simple.configure')
 
         help, config = get_config(['--help'])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config([])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config(['--enable-foo'])
         self.assertIn('BAR', config)
-        self.assertEquals(config['BAR'], PositiveOptionValue())
+        self.assertEqual(config['BAR'], PositiveOptionValue())
 
         with self.assertRaises(InvalidOptionError) as e:
             get_config(['--enable-foo', '--disable-bar'])
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             "'--enable-bar' implied by '--enable-foo' conflicts with "
             "'--disable-bar' from the command-line")
@@ -541,31 +541,31 @@
                 *args, configure='imply_option/negative.configure')
 
         help, config = get_config(['--help'])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config([])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config(['--enable-foo'])
         self.assertIn('BAR', config)
-        self.assertEquals(config['BAR'], NegativeOptionValue())
+        self.assertEqual(config['BAR'], NegativeOptionValue())
 
         with self.assertRaises(InvalidOptionError) as e:
             get_config(['--enable-foo', '--enable-bar'])
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             "'--disable-bar' implied by '--enable-foo' conflicts with "
             "'--enable-bar' from the command-line")
 
         config = get_config(['--disable-hoge'])
         self.assertIn('BAR', config)
-        self.assertEquals(config['BAR'], NegativeOptionValue())
+        self.assertEqual(config['BAR'], NegativeOptionValue())
 
         with self.assertRaises(InvalidOptionError) as e:
             get_config(['--disable-hoge', '--enable-bar'])
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             "'--disable-bar' implied by '--disable-hoge' conflicts with "
             "'--enable-bar' from the command-line")
@@ -576,23 +576,23 @@
                 *args, configure='imply_option/values.configure')
 
         help, config = get_config(['--help'])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config([])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config(['--enable-foo=a'])
         self.assertIn('BAR', config)
-        self.assertEquals(config['BAR'], PositiveOptionValue(('a',)))
+        self.assertEqual(config['BAR'], PositiveOptionValue(('a',)))
 
         config = get_config(['--enable-foo=a,b'])
         self.assertIn('BAR', config)
-        self.assertEquals(config['BAR'], PositiveOptionValue(('a','b')))
+        self.assertEqual(config['BAR'], PositiveOptionValue(('a','b')))
 
         with self.assertRaises(InvalidOptionError) as e:
             get_config(['--enable-foo=a,b', '--disable-bar'])
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             "'--enable-bar=a,b' implied by '--enable-foo' conflicts with "
             "'--disable-bar' from the command-line")
@@ -603,15 +603,15 @@
                 *args, configure='imply_option/infer.configure')
 
         help, config = get_config(['--help'])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config([])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         with self.assertRaises(InvalidOptionError) as e:
             get_config(['--enable-foo', '--disable-bar'])
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             "'--enable-bar' implied by '--enable-foo' conflicts with "
             "'--disable-bar' from the command-line")
@@ -619,7 +619,7 @@
         with self.assertRaises(ConfigureError) as e:
             self.get_config([], configure='imply_option/infer_ko.configure')
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             "Cannot infer what implies '--enable-bar'. Please add a `reason` "
             "to the `imply_option` call.")
@@ -630,25 +630,25 @@
                 *args, configure='imply_option/imm.configure')
 
         help, config = get_config(['--help'])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config = get_config([])
-        self.assertEquals(config, {})
+        self.assertEqual(config, {})
 
         config_path = mozpath.abspath(
             mozpath.join(test_data_path, 'imply_option', 'imm.configure'))
 
-        with self.assertRaisesRegexp(InvalidOptionError,
+        with self.assertRaisesRegex(InvalidOptionError,
             "--enable-foo' implied by 'imply_option at %s:7' conflicts with "
             "'--disable-foo' from the command-line" % config_path):
             get_config(['--disable-foo'])
 
-        with self.assertRaisesRegexp(InvalidOptionError,
+        with self.assertRaisesRegex(InvalidOptionError,
             "--enable-bar=foo,bar' implied by 'imply_option at %s:16' conflicts"
             " with '--enable-bar=a,b,c' from the command-line" % config_path):
             get_config(['--enable-bar=a,b,c'])
 
-        with self.assertRaisesRegexp(InvalidOptionError,
+        with self.assertRaisesRegex(InvalidOptionError,
             "--enable-baz=BAZ' implied by 'imply_option at %s:25' conflicts"
             " with '--enable-baz=QUUX' from the command-line" % config_path):
             get_config(['--enable-baz=QUUX'])
@@ -660,7 +660,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "`--with-foo`, emitted from `%s` line 2, is unknown."
                           % mozpath.join(test_data_path, 'moz.configure'))
 
@@ -675,7 +675,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "Unexpected type: 'int'")
 
     def test_imply_option_when(self):
@@ -686,12 +686,12 @@
             set_config('QUX', depends('--with-qux')(lambda x: x))
         '''):
             config = self.get_config()
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'QUX': NegativeOptionValue(),
             })
 
             config = self.get_config(['--with-foo'])
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'QUX': PositiveOptionValue(),
             })
 
@@ -700,7 +700,7 @@
             with self.moz_configure('option("--with-foo", help="foo")'):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Option `--with-foo` is not handled ; reference it with a @depends'
         )
@@ -712,7 +712,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Option `--with-foo` already defined'
         )
@@ -724,7 +724,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Option `MOZ_FOO` already defined'
         )
@@ -736,7 +736,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Option `MOZ_FOO` already defined'
         )
@@ -748,7 +748,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Option `MOZ_FOO` already defined'
         )
@@ -760,7 +760,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Option `--with-foo` already defined'
         )
@@ -776,18 +776,18 @@
             set_config('QUX', depends('--with-qux', when='--with-foo')(lambda x: x))
         '''):
             config = self.get_config()
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': NegativeOptionValue(),
             })
 
             config = self.get_config(['--with-foo'])
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': PositiveOptionValue(),
                 'QUX': NegativeOptionValue(),
             })
 
             config = self.get_config(['--with-foo', '--with-qux'])
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': PositiveOptionValue(),
                 'QUX': PositiveOptionValue(),
             })
@@ -795,7 +795,7 @@
             with self.assertRaises(InvalidOptionError) as e:
                 self.get_config(['--with-bar'])
 
-            self.assertEquals(
+            self.assertEqual(
                 e.exception.message,
                 '--with-bar is not available in this configuration'
             )
@@ -803,7 +803,7 @@
             with self.assertRaises(InvalidOptionError) as e:
                 self.get_config(['--with-qux'])
 
-            self.assertEquals(
+            self.assertEqual(
                 e.exception.message,
                 '--with-qux is not available in this configuration'
             )
@@ -811,18 +811,18 @@
             with self.assertRaises(InvalidOptionError) as e:
                 self.get_config(['QUX=1'])
 
-            self.assertEquals(
+            self.assertEqual(
                 e.exception.message,
                 'QUX is not available in this configuration'
             )
 
             config = self.get_config(env={'QUX': '1'})
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': NegativeOptionValue(),
             })
 
             help, config = self.get_config(['--help'])
-            self.assertEquals(help, textwrap.dedent('''\
+            self.assertEqual(help, textwrap.dedent('''\
                 Usage: configure [options]
 
                 Options: [defaults in brackets after descriptions]
@@ -833,7 +833,7 @@
             '''))
 
             help, config = self.get_config(['--help', '--with-foo'])
-            self.assertEquals(help, textwrap.dedent('''\
+            self.assertEqual(help, textwrap.dedent('''\
                 Usage: configure [options]
 
                 Options: [defaults in brackets after descriptions]
@@ -851,7 +851,7 @@
             with self.assertRaises(ConfigureError) as e:
                 self.get_config()
 
-            self.assertEquals(e.exception.message,
+            self.assertEqual(e.exception.message,
                               '@depends function needs the same `when` as '
                               'options it depends on')
 
@@ -868,7 +868,7 @@
             with self.assertRaises(ConfigureError) as e:
                 self.get_config()
 
-            self.assertEquals(e.exception.message,
+            self.assertEqual(e.exception.message,
                               '@depends function needs the same `when` as '
                               'options it depends on')
 
@@ -877,7 +877,7 @@
             with self.moz_configure('include("../foo.configure")'):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Cannot include `%s` because it is not in a subdirectory of `%s`'
             % (mozpath.normpath(mozpath.join(test_data_path, '..',
@@ -892,7 +892,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'Cannot include `%s` because it was included already.'
             % mozpath.normpath(mozpath.join(test_data_path,
@@ -905,7 +905,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message, "Unexpected type: 'int'")
+        self.assertEqual(e.exception.message, "Unexpected type: 'int'")
 
     def test_include_when(self):
         with MockedOpen({
@@ -948,26 +948,26 @@
             '''),
         }):
             config = self.get_config()
-            self.assertEquals(config, {})
+            self.assertEqual(config, {})
 
             config = self.get_config(['--with-foo'])
-            self.assertEquals(config, {})
+            self.assertEqual(config, {})
 
             config = self.get_config(['--with-bar'])
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'BAR': 'bar',
             })
 
             with self.assertRaises(InvalidOptionError) as e:
                 self.get_config(['--with-qux'])
 
-            self.assertEquals(
+            self.assertEqual(
                 e.exception.message,
                 '--with-qux is not available in this configuration'
             )
 
             config = self.get_config(['--with-foo', '--with-foo-really'])
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': 'foo',
                 'FOO2': True,
             })
@@ -979,7 +979,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message, 'Cannot reassign builtins')
+        self.assertEqual(e.exception.message, 'Cannot reassign builtins')
 
         with self.assertRaises(KeyError) as e:
             with self.moz_configure('''
@@ -987,7 +987,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           'Cannot assign `foo` because it is neither a '
                           '@depends nor a @template')
 
@@ -1000,7 +1000,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "@depends needs at least one argument")
 
         with self.assertRaises(ConfigureError) as e:
@@ -1011,7 +1011,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "'--with-foo' is not a known option. Maybe it's "
                           "declared too late?")
 
@@ -1023,7 +1023,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "Option must not contain an '='")
 
         with self.assertRaises(TypeError) as e:
@@ -1034,7 +1034,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "Cannot use object of type 'int' as argument "
                           "to @depends")
 
@@ -1046,7 +1046,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "Cannot decorate generator functions with @depends")
 
         with self.assertRaises(TypeError) as e:
@@ -1055,7 +1055,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "Unexpected type: 'int'")
 
         with self.assertRaises(ConfigureError) as e:
@@ -1069,7 +1069,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The `foo` function may not be called")
 
         with self.assertRaises(TypeError) as e:
@@ -1080,7 +1080,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "depends_impl() got an unexpected keyword argument 'foo'")
 
     def test_depends_when(self):
@@ -1105,12 +1105,12 @@
             set_config('QUX', qux)
         '''):
             config = self.get_config()
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': 'foo',
             })
 
             config = self.get_config(['--with-qux'])
-            self.assertEquals(config, {
+            self.assertEqual(config, {
                 'FOO': 'foo',
                 'QUX': 'qux',
             })
@@ -1125,7 +1125,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           '@imports must appear after @template')
 
         with self.assertRaises(ConfigureError) as e:
@@ -1138,7 +1138,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           '@imports must appear after @depends')
 
         for import_ in (
@@ -1155,7 +1155,7 @@
                 ''' % import_):
                     self.get_config()
 
-            self.assertEquals(e.exception.message, "Unexpected type: 'int'")
+            self.assertEqual(e.exception.message, "Unexpected type: 'int'")
 
         with self.assertRaises(TypeError) as e:
             with self.moz_configure('''
@@ -1166,7 +1166,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message, "Unexpected type: 'int'")
+        self.assertEqual(e.exception.message, "Unexpected type: 'int'")
 
         with self.assertRaises(ValueError) as e:
             with self.moz_configure('''
@@ -1176,7 +1176,7 @@
             '''):
                 self.get_config()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "Invalid argument to @imports: 'os*'")
 
     def test_only_when(self):
@@ -1231,7 +1231,7 @@
             with self.assertRaises(InvalidOptionError) as e:
                 self.get_config(['--foo'])
 
-            self.assertEquals(e.exception.message,
+            self.assertEqual(e.exception.message,
                               '--foo is not available in this configuration')
 
         # Cannot depend on an option defined in a only_when block, because we
@@ -1242,7 +1242,7 @@
             with self.assertRaises(ConfigureError) as e:
                 self.get_config()
 
-            self.assertEquals(e.exception.message,
+            self.assertEqual(e.exception.message,
                               '@depends function needs the same `when` as '
                               'options it depends on')
 
@@ -1259,7 +1259,7 @@
             with self.assertRaises(InvalidOptionError) as e:
                 self.get_config()
 
-            self.assertEquals(e.exception.message,
+            self.assertEqual(e.exception.message,
                               '--foo is not available in this configuration')
 
         # And similarly doesn't fail when the condition is true.
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_lint.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_lint.py	(refactored)
@@ -2,9 +2,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
 
-from StringIO import StringIO
+
+from io import StringIO
 import os
 import textwrap
 import unittest
@@ -62,7 +62,7 @@
             '''):
                 self.lint_test()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "`bar` depends on '--help' and `foo`. "
                           "`foo` must depend on '--help'")
 
@@ -85,7 +85,7 @@
             '''):
                 self.lint_test()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "`bar` depends on '--help' and `foo`. "
                           "`foo` must depend on '--help'")
 
@@ -111,7 +111,7 @@
             '''):
                 self.lint_test()
 
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "Missing @depends for `foo`: '--help'")
 
         # There is a default restricted `os` module when there is no explicit
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_moz_configure.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_moz_configure.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 from mozunit import main
 from mozpack import path as mozpath
@@ -23,10 +23,10 @@
             shell = mozpath.abspath('/bin/sh')
             return result.replace('CONFIG_SHELL=%s ' % shell, '')
 
-        self.assertEquals('--enable-application=browser',
+        self.assertEqual('--enable-application=browser',
                           get_value_for(['--enable-application=browser']))
 
-        self.assertEquals('--enable-application=browser '
+        self.assertEqual('--enable-application=browser '
                           'MOZ_PROFILING=1',
                           get_value_for(['--enable-application=browser',
                                          'MOZ_PROFILING=1']))
@@ -35,25 +35,25 @@
             environ={'MOZ_PROFILING': '1'},
             mozconfig='ac_add_options --enable-project=js')
 
-        self.assertEquals('--enable-project=js MOZ_PROFILING=1',
+        self.assertEqual('--enable-project=js MOZ_PROFILING=1',
                           value)
 
         # --disable-js-shell is the default, so it's filtered out.
-        self.assertEquals('--enable-application=browser',
+        self.assertEqual('--enable-application=browser',
                           get_value_for(['--enable-application=browser',
                                          '--disable-js-shell']))
 
         # Normally, --without-foo would be filtered out because that's the
         # default, but since it is a (fake) old-configure option, it always
         # appears.
-        self.assertEquals('--enable-application=browser --without-foo',
+        self.assertEqual('--enable-application=browser --without-foo',
                           get_value_for(['--enable-application=browser',
                                          '--without-foo']))
-        self.assertEquals('--enable-application=browser --with-foo',
+        self.assertEqual('--enable-application=browser --with-foo',
                           get_value_for(['--enable-application=browser',
                                          '--with-foo']))
 
-        self.assertEquals("--enable-application=browser '--with-foo=foo bar'",
+        self.assertEqual("--enable-application=browser '--with-foo=foo bar'",
                           get_value_for(['--enable-application=browser',
                                          '--with-foo=foo bar']))
 
@@ -65,7 +65,7 @@
                 self.version = version
 
             def __call__(self, stdin, args):
-                this.assertEquals(args, ('-version',))
+                this.assertEqual(args, ('-version',))
                 return 0, self.version, ''
 
         def check_nsis_version(version):
@@ -80,13 +80,13 @@
         with self.assertRaises(SystemExit) as e:
             check_nsis_version('v3.0a2')
 
-        self.assertEquals(check_nsis_version('v3.0b1'), '3.0b1')
-        self.assertEquals(check_nsis_version('v3.0b2'), '3.0b2')
-        self.assertEquals(check_nsis_version('v3.0rc1'), '3.0rc1')
-        self.assertEquals(check_nsis_version('v3.0'), '3.0')
-        self.assertEquals(check_nsis_version('v3.0-2'), '3.0')
-        self.assertEquals(check_nsis_version('v3.0.1'), '3.0')
-        self.assertEquals(check_nsis_version('v3.1'), '3.1')
+        self.assertEqual(check_nsis_version('v3.0b1'), '3.0b1')
+        self.assertEqual(check_nsis_version('v3.0b2'), '3.0b2')
+        self.assertEqual(check_nsis_version('v3.0rc1'), '3.0rc1')
+        self.assertEqual(check_nsis_version('v3.0'), '3.0')
+        self.assertEqual(check_nsis_version('v3.0-2'), '3.0')
+        self.assertEqual(check_nsis_version('v3.0.1'), '3.0')
+        self.assertEqual(check_nsis_version('v3.1'), '3.1')
 
 
 if __name__ == '__main__':
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_options.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_options.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import unittest
 
@@ -27,139 +27,139 @@
 class TestOption(unittest.TestCase):
     def test_option(self):
         option = Option('--option')
-        self.assertEquals(option.prefix, '')
-        self.assertEquals(option.name, 'option')
-        self.assertEquals(option.env, None)
+        self.assertEqual(option.prefix, '')
+        self.assertEqual(option.name, 'option')
+        self.assertEqual(option.env, None)
         self.assertFalse(option.default)
 
         option = Option('--enable-option')
-        self.assertEquals(option.prefix, 'enable')
-        self.assertEquals(option.name, 'option')
-        self.assertEquals(option.env, None)
+        self.assertEqual(option.prefix, 'enable')
+        self.assertEqual(option.name, 'option')
+        self.assertEqual(option.env, None)
         self.assertFalse(option.default)
 
         option = Option('--disable-option')
-        self.assertEquals(option.prefix, 'disable')
-        self.assertEquals(option.name, 'option')
-        self.assertEquals(option.env, None)
+        self.assertEqual(option.prefix, 'disable')
+        self.assertEqual(option.name, 'option')
+        self.assertEqual(option.env, None)
         self.assertTrue(option.default)
 
         option = Option('--with-option')
-        self.assertEquals(option.prefix, 'with')
-        self.assertEquals(option.name, 'option')
-        self.assertEquals(option.env, None)
+        self.assertEqual(option.prefix, 'with')
+        self.assertEqual(option.name, 'option')
+        self.assertEqual(option.env, None)
         self.assertFalse(option.default)
 
         option = Option('--without-option')
-        self.assertEquals(option.prefix, 'without')
-        self.assertEquals(option.name, 'option')
-        self.assertEquals(option.env, None)
+        self.assertEqual(option.prefix, 'without')
+        self.assertEqual(option.name, 'option')
+        self.assertEqual(option.env, None)
         self.assertTrue(option.default)
 
         option = Option('--without-option-foo', env='MOZ_OPTION')
-        self.assertEquals(option.env, 'MOZ_OPTION')
+        self.assertEqual(option.env, 'MOZ_OPTION')
 
         option = Option(env='MOZ_OPTION')
-        self.assertEquals(option.prefix, '')
-        self.assertEquals(option.name, None)
-        self.assertEquals(option.env, 'MOZ_OPTION')
+        self.assertEqual(option.prefix, '')
+        self.assertEqual(option.name, None)
+        self.assertEqual(option.env, 'MOZ_OPTION')
         self.assertFalse(option.default)
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=0, default=('a',))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=1, default=())
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'default must be a bool, a string or a tuple of strings')
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=1, default=True)
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=1, default=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=2, default=())
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'default must be a bool, a string or a tuple of strings')
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=2, default=True)
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=2, default=('a',))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs='?', default=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs='+', default=())
-        self.assertEquals(
+        self.assertEqual(
             e.exception.message,
             'default must be a bool, a string or a tuple of strings')
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs='+', default=True)
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         # --disable options with a nargs value that requires at least one
         # argument need to be given a default.
         with self.assertRaises(InvalidOptionError) as e:
             Option('--disable-option', nargs=1)
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--disable-option', nargs='+')
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
         # Test nargs inference from default value
         option = Option('--with-foo', default=True)
-        self.assertEquals(option.nargs, 0)
+        self.assertEqual(option.nargs, 0)
 
         option = Option('--with-foo', default=False)
-        self.assertEquals(option.nargs, 0)
+        self.assertEqual(option.nargs, 0)
 
         option = Option('--with-foo', default='a')
-        self.assertEquals(option.nargs, '?')
+        self.assertEqual(option.nargs, '?')
 
         option = Option('--with-foo', default=('a',))
-        self.assertEquals(option.nargs, '?')
+        self.assertEqual(option.nargs, '?')
 
         option = Option('--with-foo', default=('a', 'b'))
-        self.assertEquals(option.nargs, '*')
+        self.assertEqual(option.nargs, '*')
 
         option = Option(env='FOO', default=True)
-        self.assertEquals(option.nargs, 0)
+        self.assertEqual(option.nargs, 0)
 
         option = Option(env='FOO', default=False)
-        self.assertEquals(option.nargs, 0)
+        self.assertEqual(option.nargs, 0)
 
         option = Option(env='FOO', default='a')
-        self.assertEquals(option.nargs, '?')
+        self.assertEqual(option.nargs, '?')
 
         option = Option(env='FOO', default=('a',))
-        self.assertEquals(option.nargs, '?')
+        self.assertEqual(option.nargs, '?')
 
         option = Option(env='FOO', default=('a', 'b'))
-        self.assertEquals(option.nargs, '*')
+        self.assertEqual(option.nargs, '*')
 
     def test_option_option(self):
         for option in (
@@ -169,70 +169,70 @@
             '--with-option',
             '--without-option',
         ):
-            self.assertEquals(Option(option).option, option)
-            self.assertEquals(Option(option, env='FOO').option, option)
+            self.assertEqual(Option(option).option, option)
+            self.assertEqual(Option(option, env='FOO').option, option)
 
             opt = Option(option, default=False)
-            self.assertEquals(opt.option,
+            self.assertEqual(opt.option,
                               option.replace('-disable-', '-enable-')
                                     .replace('-without-', '-with-'))
 
             opt = Option(option, default=True)
-            self.assertEquals(opt.option,
+            self.assertEqual(opt.option,
                               option.replace('-enable-', '-disable-')
                                     .replace('-with-', '-without-'))
 
-        self.assertEquals(Option(env='FOO').option, 'FOO')
+        self.assertEqual(Option(env='FOO').option, 'FOO')
 
     def test_option_choices(self):
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=3, choices=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           'Not enough `choices` for `nargs`')
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--without-option', nargs=1, choices=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           'A `default` must be given along with `choices`')
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--without-option', nargs='+', choices=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           'A `default` must be given along with `choices`')
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--without-option', default='c', choices=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The `default` value must be one of 'a', 'b'")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--without-option', default=('a', 'c',), choices=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The `default` value must be one of 'a', 'b'")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--without-option', default=('c',), choices=('a', 'b'))
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The `default` value must be one of 'a', 'b'")
 
         option = Option('--with-option', nargs='+', choices=('a', 'b'))
         with self.assertRaises(InvalidOptionError) as e:
             option.get_value('--with-option=c')
-        self.assertEquals(e.exception.message, "'c' is not one of 'a', 'b'")
+        self.assertEqual(e.exception.message, "'c' is not one of 'a', 'b'")
 
         value = option.get_value('--with-option=b,a')
         self.assertTrue(value)
-        self.assertEquals(PositiveOptionValue(('b', 'a')), value)
+        self.assertEqual(PositiveOptionValue(('b', 'a')), value)
 
         option = Option('--without-option', nargs='*', default='a',
                         choices=('a', 'b'))
         with self.assertRaises(InvalidOptionError) as e:
             option.get_value('--with-option=c')
-        self.assertEquals(e.exception.message, "'c' is not one of 'a', 'b'")
+        self.assertEqual(e.exception.message, "'c' is not one of 'a', 'b'")
 
         value = option.get_value('--with-option=b,a')
         self.assertTrue(value)
-        self.assertEquals(PositiveOptionValue(('b', 'a')), value)
+        self.assertEqual(PositiveOptionValue(('b', 'a')), value)
 
         # Test nargs inference from choices
         option = Option('--with-option', choices=('a', 'b'))
@@ -243,71 +243,71 @@
                         choices=('a', 'b', 'c', 'd'))
 
         value = option.get_value('--with-option=+d')
-        self.assertEquals(PositiveOptionValue(('b', 'c', 'd')), value)
+        self.assertEqual(PositiveOptionValue(('b', 'c', 'd')), value)
 
         value = option.get_value('--with-option=-b')
-        self.assertEquals(PositiveOptionValue(('c',)), value)
+        self.assertEqual(PositiveOptionValue(('c',)), value)
 
         value = option.get_value('--with-option=-b,+d')
-        self.assertEquals(PositiveOptionValue(('c','d')), value)
+        self.assertEqual(PositiveOptionValue(('c','d')), value)
 
         # Adding something that is in the default is fine
         value = option.get_value('--with-option=+b')
-        self.assertEquals(PositiveOptionValue(('b', 'c')), value)
+        self.assertEqual(PositiveOptionValue(('b', 'c')), value)
 
         # Removing something that is not in the default is fine, as long as it
         # is one of the choices
         value = option.get_value('--with-option=-a')
-        self.assertEquals(PositiveOptionValue(('b', 'c')), value)
+        self.assertEqual(PositiveOptionValue(('b', 'c')), value)
 
         with self.assertRaises(InvalidOptionError) as e:
             option.get_value('--with-option=-e')
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "'e' is not one of 'a', 'b', 'c', 'd'")
 
         # Other "not a choice" errors.
         with self.assertRaises(InvalidOptionError) as e:
             option.get_value('--with-option=+e')
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "'e' is not one of 'a', 'b', 'c', 'd'")
 
         with self.assertRaises(InvalidOptionError) as e:
             option.get_value('--with-option=e')
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "'e' is not one of 'a', 'b', 'c', 'd'")
 
     def test_option_value_format(self):
         val = PositiveOptionValue()
-        self.assertEquals('--with-value', val.format('--with-value'))
-        self.assertEquals('--with-value', val.format('--without-value'))
-        self.assertEquals('--enable-value', val.format('--enable-value'))
-        self.assertEquals('--enable-value', val.format('--disable-value'))
-        self.assertEquals('--value', val.format('--value'))
-        self.assertEquals('VALUE=1', val.format('VALUE'))
+        self.assertEqual('--with-value', val.format('--with-value'))
+        self.assertEqual('--with-value', val.format('--without-value'))
+        self.assertEqual('--enable-value', val.format('--enable-value'))
+        self.assertEqual('--enable-value', val.format('--disable-value'))
+        self.assertEqual('--value', val.format('--value'))
+        self.assertEqual('VALUE=1', val.format('VALUE'))
 
         val = PositiveOptionValue(('a',))
-        self.assertEquals('--with-value=a', val.format('--with-value'))
-        self.assertEquals('--with-value=a', val.format('--without-value'))
-        self.assertEquals('--enable-value=a', val.format('--enable-value'))
-        self.assertEquals('--enable-value=a', val.format('--disable-value'))
-        self.assertEquals('--value=a', val.format('--value'))
-        self.assertEquals('VALUE=a', val.format('VALUE'))
+        self.assertEqual('--with-value=a', val.format('--with-value'))
+        self.assertEqual('--with-value=a', val.format('--without-value'))
+        self.assertEqual('--enable-value=a', val.format('--enable-value'))
+        self.assertEqual('--enable-value=a', val.format('--disable-value'))
+        self.assertEqual('--value=a', val.format('--value'))
+        self.assertEqual('VALUE=a', val.format('VALUE'))
 
         val = PositiveOptionValue(('a', 'b'))
-        self.assertEquals('--with-value=a,b', val.format('--with-value'))
-        self.assertEquals('--with-value=a,b', val.format('--without-value'))
-        self.assertEquals('--enable-value=a,b', val.format('--enable-value'))
-        self.assertEquals('--enable-value=a,b', val.format('--disable-value'))
-        self.assertEquals('--value=a,b', val.format('--value'))
-        self.assertEquals('VALUE=a,b', val.format('VALUE'))
+        self.assertEqual('--with-value=a,b', val.format('--with-value'))
+        self.assertEqual('--with-value=a,b', val.format('--without-value'))
+        self.assertEqual('--enable-value=a,b', val.format('--enable-value'))
+        self.assertEqual('--enable-value=a,b', val.format('--disable-value'))
+        self.assertEqual('--value=a,b', val.format('--value'))
+        self.assertEqual('VALUE=a,b', val.format('VALUE'))
 
         val = NegativeOptionValue()
-        self.assertEquals('--without-value', val.format('--with-value'))
-        self.assertEquals('--without-value', val.format('--without-value'))
-        self.assertEquals('--disable-value', val.format('--enable-value'))
-        self.assertEquals('--disable-value', val.format('--disable-value'))
-        self.assertEquals('', val.format('--value'))
-        self.assertEquals('VALUE=', val.format('VALUE'))
+        self.assertEqual('--without-value', val.format('--with-value'))
+        self.assertEqual('--without-value', val.format('--without-value'))
+        self.assertEqual('--disable-value', val.format('--enable-value'))
+        self.assertEqual('--disable-value', val.format('--disable-value'))
+        self.assertEqual('', val.format('--value'))
+        self.assertEqual('VALUE=', val.format('VALUE'))
 
     def test_option_value(self, name='option', nargs=0, default=None):
         disabled = name.startswith(('disable-', 'without-'))
@@ -324,28 +324,28 @@
 
         if nargs in (0, '?', '*') or disabled:
             value = option.get_value('--%s' % name, 'option')
-            self.assertEquals(value, posOptionValue())
-            self.assertEquals(value.origin, 'option')
+            self.assertEqual(value, posOptionValue())
+            self.assertEqual(value.origin, 'option')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('--%s' % name)
             if nargs == 1:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes 1 value' % name)
             elif nargs == '+':
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes 1 or more values' % name)
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes 2 values' % name)
 
         value = option.get_value('')
-        self.assertEquals(value, defaultValue)
-        self.assertEquals(value.origin, 'default')
+        self.assertEqual(value, defaultValue)
+        self.assertEqual(value.origin, 'default')
 
         value = option.get_value(None)
-        self.assertEquals(value, defaultValue)
-        self.assertEquals(value.origin, 'default')
+        self.assertEqual(value, defaultValue)
+        self.assertEqual(value.origin, 'default')
 
         with self.assertRaises(AssertionError):
             value = option.get_value('MOZ_OPTION=', 'environment')
@@ -358,47 +358,47 @@
 
         if nargs in (1, '?', '*', '+') and not disabled:
             value = option.get_value('--%s=' % name, 'option')
-            self.assertEquals(value, PositiveOptionValue(('',)))
-            self.assertEquals(value.origin, 'option')
+            self.assertEqual(value, PositiveOptionValue(('',)))
+            self.assertEqual(value.origin, 'option')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('--%s=' % name)
             if disabled:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'Cannot pass a value to --%s' % name)
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes %d values' % (name, nargs))
 
         if nargs in (1, '?', '*', '+') and not disabled:
             value = option.get_value('--%s=foo' % name, 'option')
-            self.assertEquals(value, PositiveOptionValue(('foo',)))
-            self.assertEquals(value.origin, 'option')
+            self.assertEqual(value, PositiveOptionValue(('foo',)))
+            self.assertEqual(value.origin, 'option')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('--%s=foo' % name)
             if disabled:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'Cannot pass a value to --%s' % name)
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes %d values' % (name, nargs))
 
         if nargs in (2, '*', '+') and not disabled:
             value = option.get_value('--%s=foo,bar' % name, 'option')
-            self.assertEquals(value, PositiveOptionValue(('foo', 'bar')))
-            self.assertEquals(value.origin, 'option')
+            self.assertEqual(value, PositiveOptionValue(('foo', 'bar')))
+            self.assertEqual(value.origin, 'option')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('--%s=foo,bar' % name, 'option')
             if disabled:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'Cannot pass a value to --%s' % name)
             elif nargs == '?':
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes 0 or 1 values' % name)
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes %d value%s'
                                   % (name, nargs, 's' if nargs != 1 else ''))
 
@@ -406,59 +406,59 @@
                         default=default)
         if nargs in (0, '?', '*') or disabled:
             value = option.get_value('--%s' % name, 'option')
-            self.assertEquals(value, posOptionValue())
-            self.assertEquals(value.origin, 'option')
+            self.assertEqual(value, posOptionValue())
+            self.assertEqual(value.origin, 'option')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('--%s' % name)
             if disabled:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'Cannot pass a value to --%s' % name)
             elif nargs == '+':
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes 1 or more values' % name)
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes %d value%s'
                                   % (name, nargs, 's' if nargs != 1 else ''))
 
         value = option.get_value('')
-        self.assertEquals(value, defaultValue)
-        self.assertEquals(value.origin, 'default')
+        self.assertEqual(value, defaultValue)
+        self.assertEqual(value.origin, 'default')
 
         value = option.get_value(None)
-        self.assertEquals(value, defaultValue)
-        self.assertEquals(value.origin, 'default')
+        self.assertEqual(value, defaultValue)
+        self.assertEqual(value.origin, 'default')
 
         value = option.get_value('MOZ_OPTION=', 'environment')
-        self.assertEquals(value, NegativeOptionValue())
-        self.assertEquals(value.origin, 'environment')
+        self.assertEqual(value, NegativeOptionValue())
+        self.assertEqual(value.origin, 'environment')
 
         if nargs in (0, '?', '*'):
             value = option.get_value('MOZ_OPTION=1', 'environment')
-            self.assertEquals(value, PositiveOptionValue())
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value, PositiveOptionValue())
+            self.assertEqual(value.origin, 'environment')
         elif nargs in (1, '+'):
             value = option.get_value('MOZ_OPTION=1', 'environment')
-            self.assertEquals(value, PositiveOptionValue(('1',)))
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value, PositiveOptionValue(('1',)))
+            self.assertEqual(value.origin, 'environment')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('MOZ_OPTION=1', 'environment')
-            self.assertEquals(e.exception.message, 'MOZ_OPTION takes 2 values')
+            self.assertEqual(e.exception.message, 'MOZ_OPTION takes 2 values')
 
         if nargs in (1, '?', '*', '+') and not disabled:
             value = option.get_value('--%s=' % name, 'option')
-            self.assertEquals(value, PositiveOptionValue(('',)))
-            self.assertEquals(value.origin, 'option')
+            self.assertEqual(value, PositiveOptionValue(('',)))
+            self.assertEqual(value.origin, 'option')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('--%s=' % name, 'option')
             if disabled:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'Cannot pass a value to --%s' % name)
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s takes %d values' % (name, nargs))
 
         with self.assertRaises(AssertionError):
@@ -466,26 +466,26 @@
 
         if nargs in (1, '?', '*', '+'):
             value = option.get_value('MOZ_OPTION=foo', 'environment')
-            self.assertEquals(value, PositiveOptionValue(('foo',)))
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value, PositiveOptionValue(('foo',)))
+            self.assertEqual(value.origin, 'environment')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('MOZ_OPTION=foo', 'environment')
-            self.assertEquals(e.exception.message,
+            self.assertEqual(e.exception.message,
                               'MOZ_OPTION takes %d values' % nargs)
 
         if nargs in (2, '*', '+'):
             value = option.get_value('MOZ_OPTION=foo,bar', 'environment')
-            self.assertEquals(value, PositiveOptionValue(('foo', 'bar')))
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value, PositiveOptionValue(('foo', 'bar')))
+            self.assertEqual(value.origin, 'environment')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('MOZ_OPTION=foo,bar', 'environment')
             if nargs == '?':
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'MOZ_OPTION takes 0 or 1 values')
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'MOZ_OPTION takes %d value%s'
                                   % (nargs, 's' if nargs != 1 else ''))
 
@@ -497,26 +497,26 @@
             env_option.get_value('--%s' % name)
 
         value = env_option.get_value('')
-        self.assertEquals(value, defaultValue)
-        self.assertEquals(value.origin, 'default')
+        self.assertEqual(value, defaultValue)
+        self.assertEqual(value.origin, 'default')
 
         value = env_option.get_value('MOZ_OPTION=', 'environment')
-        self.assertEquals(value, negOptionValue())
-        self.assertEquals(value.origin, 'environment')
+        self.assertEqual(value, negOptionValue())
+        self.assertEqual(value.origin, 'environment')
 
         if nargs in (0, '?', '*'):
             value = env_option.get_value('MOZ_OPTION=1', 'environment')
-            self.assertEquals(value, posOptionValue())
+            self.assertEqual(value, posOptionValue())
             self.assertTrue(value)
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value.origin, 'environment')
         elif nargs in (1, '+'):
             value = env_option.get_value('MOZ_OPTION=1', 'environment')
-            self.assertEquals(value, PositiveOptionValue(('1',)))
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value, PositiveOptionValue(('1',)))
+            self.assertEqual(value.origin, 'environment')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 env_option.get_value('MOZ_OPTION=1', 'environment')
-            self.assertEquals(e.exception.message, 'MOZ_OPTION takes 2 values')
+            self.assertEqual(e.exception.message, 'MOZ_OPTION takes 2 values')
 
         with self.assertRaises(AssertionError) as e:
             env_option.get_value('--%s' % name)
@@ -526,26 +526,26 @@
 
         if nargs in (1, '?', '*', '+'):
             value = env_option.get_value('MOZ_OPTION=foo', 'environment')
-            self.assertEquals(value, PositiveOptionValue(('foo',)))
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value, PositiveOptionValue(('foo',)))
+            self.assertEqual(value.origin, 'environment')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 env_option.get_value('MOZ_OPTION=foo', 'environment')
-            self.assertEquals(e.exception.message,
+            self.assertEqual(e.exception.message,
                               'MOZ_OPTION takes %d values' % nargs)
 
         if nargs in (2, '*', '+'):
             value = env_option.get_value('MOZ_OPTION=foo,bar', 'environment')
-            self.assertEquals(value, PositiveOptionValue(('foo', 'bar')))
-            self.assertEquals(value.origin, 'environment')
+            self.assertEqual(value, PositiveOptionValue(('foo', 'bar')))
+            self.assertEqual(value.origin, 'environment')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 env_option.get_value('MOZ_OPTION=foo,bar', 'environment')
             if nargs == '?':
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'MOZ_OPTION takes 0 or 1 values')
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   'MOZ_OPTION takes %d value%s'
                                   % (nargs, 's' if nargs != 1 else ''))
 
@@ -557,28 +557,28 @@
                                         default=default)
 
         value = option.get_value('--%s-option' % disable, 'option')
-        self.assertEquals(value, NegativeOptionValue())
-        self.assertEquals(value.origin, 'option')
+        self.assertEqual(value, NegativeOptionValue())
+        self.assertEqual(value.origin, 'option')
 
         option = self.test_option_value('%s-option' % disable, nargs=nargs,
                                         default=default)
 
         if nargs in (0, '?', '*'):
             value = option.get_value('--%s-option' % enable, 'option')
-            self.assertEquals(value, PositiveOptionValue())
-            self.assertEquals(value.origin, 'option')
+            self.assertEqual(value, PositiveOptionValue())
+            self.assertEqual(value.origin, 'option')
         else:
             with self.assertRaises(InvalidOptionError) as e:
                 option.get_value('--%s-option' % enable, 'option')
             if nargs == 1:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s-option takes 1 value' % enable)
             elif nargs == '+':
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s-option takes 1 or more values'
                                   % enable)
             else:
-                self.assertEquals(e.exception.message,
+                self.assertEqual(e.exception.message,
                                   '--%s-option takes 2 values' % enable)
 
     def test_option_value_with(self):
@@ -587,12 +587,12 @@
     def test_option_value_invalid_nargs(self):
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs='foo')
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "nargs must be a positive integer, '?', '*' or '+'")
 
         with self.assertRaises(InvalidOptionError) as e:
             Option('--option', nargs=-2)
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "nargs must be a positive integer, '?', '*' or '+'")
 
     def test_option_value_nargs_1(self):
@@ -603,7 +603,7 @@
         # A default is required
         with self.assertRaises(InvalidOptionError) as e:
             Option('--disable-option', nargs=1)
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
     def test_option_value_nargs_2(self):
@@ -614,7 +614,7 @@
         # A default is required
         with self.assertRaises(InvalidOptionError) as e:
             Option('--disable-option', nargs=2)
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
     def test_option_value_nargs_0_or_1(self):
@@ -641,7 +641,7 @@
         # A default is required
         with self.assertRaises(InvalidOptionError) as e:
             Option('--disable-option', nargs='+')
-        self.assertEquals(e.exception.message,
+        self.assertEqual(e.exception.message,
                           "The given `default` doesn't satisfy `nargs`")
 
 
@@ -649,109 +649,109 @@
     def test_basic(self):
         helper = CommandLineHelper({}, ['cmd', '--foo', '--bar'])
 
-        self.assertEquals(['--foo', '--bar'], list(helper))
+        self.assertEqual(['--foo', '--bar'], list(helper))
 
         helper.add('--enable-qux')
 
-        self.assertEquals(['--foo', '--bar', '--enable-qux'], list(helper))
+        self.assertEqual(['--foo', '--bar', '--enable-qux'], list(helper))
 
         value, option = helper.handle(Option('--bar'))
-        self.assertEquals(['--foo', '--enable-qux'], list(helper))
-        self.assertEquals(PositiveOptionValue(), value)
-        self.assertEquals('--bar', option)
+        self.assertEqual(['--foo', '--enable-qux'], list(helper))
+        self.assertEqual(PositiveOptionValue(), value)
+        self.assertEqual('--bar', option)
 
         value, option = helper.handle(Option('--baz'))
-        self.assertEquals(['--foo', '--enable-qux'], list(helper))
-        self.assertEquals(NegativeOptionValue(), value)
-        self.assertEquals(None, option)
+        self.assertEqual(['--foo', '--enable-qux'], list(helper))
+        self.assertEqual(NegativeOptionValue(), value)
+        self.assertEqual(None, option)
 
     def test_precedence(self):
         foo = Option('--with-foo', nargs='*')
         helper = CommandLineHelper({}, ['cmd', '--with-foo=a,b'])
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--with-foo=a,b', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--with-foo=a,b', option)
 
         helper = CommandLineHelper({}, ['cmd', '--with-foo=a,b',
                                         '--without-foo'])
         value, option = helper.handle(foo)
-        self.assertEquals(NegativeOptionValue(), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--without-foo', option)
+        self.assertEqual(NegativeOptionValue(), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--without-foo', option)
 
         helper = CommandLineHelper({}, ['cmd', '--without-foo',
                                         '--with-foo=a,b'])
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--with-foo=a,b', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--with-foo=a,b', option)
 
         foo = Option('--with-foo', env='FOO', nargs='*')
         helper = CommandLineHelper({'FOO': ''}, ['cmd', '--with-foo=a,b'])
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--with-foo=a,b', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--with-foo=a,b', option)
 
         helper = CommandLineHelper({'FOO': 'a,b'}, ['cmd', '--without-foo'])
         value, option = helper.handle(foo)
-        self.assertEquals(NegativeOptionValue(), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--without-foo', option)
+        self.assertEqual(NegativeOptionValue(), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--without-foo', option)
 
         helper = CommandLineHelper({'FOO': ''}, ['cmd', '--with-bar=a,b'])
         value, option = helper.handle(foo)
-        self.assertEquals(NegativeOptionValue(), value)
-        self.assertEquals('environment', value.origin)
-        self.assertEquals('FOO=', option)
+        self.assertEqual(NegativeOptionValue(), value)
+        self.assertEqual('environment', value.origin)
+        self.assertEqual('FOO=', option)
 
         helper = CommandLineHelper({'FOO': 'a,b'}, ['cmd', '--without-bar'])
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
-        self.assertEquals('environment', value.origin)
-        self.assertEquals('FOO=a,b', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
+        self.assertEqual('environment', value.origin)
+        self.assertEqual('FOO=a,b', option)
 
         helper = CommandLineHelper({}, ['cmd', '--with-foo=a,b', 'FOO='])
         value, option = helper.handle(foo)
-        self.assertEquals(NegativeOptionValue(), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('FOO=', option)
+        self.assertEqual(NegativeOptionValue(), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('FOO=', option)
 
         helper = CommandLineHelper({}, ['cmd', '--without-foo', 'FOO=a,b'])
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('FOO=a,b', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('FOO=a,b', option)
 
         helper = CommandLineHelper({}, ['cmd', 'FOO=', '--with-foo=a,b'])
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--with-foo=a,b', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--with-foo=a,b', option)
 
         helper = CommandLineHelper({}, ['cmd', 'FOO=a,b', '--without-foo'])
         value, option = helper.handle(foo)
-        self.assertEquals(NegativeOptionValue(), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--without-foo', option)
+        self.assertEqual(NegativeOptionValue(), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--without-foo', option)
 
     def test_extra_args(self):
         foo = Option('--with-foo', env='FOO', nargs='*')
         helper = CommandLineHelper({}, ['cmd'])
         helper.add('FOO=a,b,c', 'other-origin')
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
-        self.assertEquals('other-origin', value.origin)
-        self.assertEquals('FOO=a,b,c', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
+        self.assertEqual('other-origin', value.origin)
+        self.assertEqual('FOO=a,b,c', option)
 
         helper = CommandLineHelper({}, ['cmd'])
         helper.add('FOO=a,b,c', 'other-origin')
         helper.add('--with-foo=a,b,c', 'other-origin')
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
-        self.assertEquals('other-origin', value.origin)
-        self.assertEquals('--with-foo=a,b,c', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
+        self.assertEqual('other-origin', value.origin)
+        self.assertEqual('--with-foo=a,b,c', option)
 
         # Adding conflicting options is not allowed.
         helper = CommandLineHelper({}, ['cmd'])
@@ -771,9 +771,9 @@
         # But adding the same is allowed.
         helper.add('FOO=a,b,c', 'other-origin')
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
-        self.assertEquals('other-origin', value.origin)
-        self.assertEquals('FOO=a,b,c', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
+        self.assertEqual('other-origin', value.origin)
+        self.assertEqual('FOO=a,b,c', option)
 
         # The same rule as above applies when using the option form vs. the
         # variable form. But we can't detect it when .add is called.
@@ -799,9 +799,9 @@
         helper.add('FOO=a,b,c', 'other-origin')
         helper.add('--with-foo=a,b,c', 'other-origin')
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
-        self.assertEquals('other-origin', value.origin)
-        self.assertEquals('--with-foo=a,b,c', option)
+        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
+        self.assertEqual('other-origin', value.origin)
+        self.assertEqual('--with-foo=a,b,c', option)
 
         # Conflicts are also not allowed against what is in the
         # environment/on the command line.
@@ -831,19 +831,19 @@
         foo = Option('--foo',
                      possible_origins=('command-line',))
         value, option = helper.handle(foo)
-        self.assertEquals(PositiveOptionValue(), value)
-        self.assertEquals('command-line', value.origin)
-        self.assertEquals('--foo', option)
+        self.assertEqual(PositiveOptionValue(), value)
+        self.assertEqual('command-line', value.origin)
+        self.assertEqual('--foo', option)
 
         bar = Option('--bar',
                      possible_origins=('mozconfig',))
-        with self.assertRaisesRegexp(InvalidOptionError,
+        with self.assertRaisesRegex(InvalidOptionError,
             "--bar can not be set by command-line. Values are accepted from: mozconfig"):
             helper.handle(bar)
 
         baz = Option(env='BAZ',
                      possible_origins=('implied',))
-        with self.assertRaisesRegexp(InvalidOptionError,
+        with self.assertRaisesRegex(InvalidOptionError,
             "BAZ=1 can not be set by environment. Values are accepted from: implied"):
             helper.handle(baz)
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py	(refactored)
@@ -2,12 +2,12 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import logging
 import os
 
-from StringIO import StringIO
+from io import StringIO
 
 from mozunit import main
 
@@ -291,9 +291,9 @@
                 compiler = sandbox._value_for(sandbox[var])
                 # Add var on both ends to make it clear which of the
                 # variables is failing the test when that happens.
-                self.assertEquals((var, compiler), (var, result))
+                self.assertEqual((var, compiler), (var, result))
             except SystemExit:
-                self.assertEquals((var, result),
+                self.assertEqual((var, result),
                                   (var, self.out.getvalue().strip()))
                 return
 
@@ -471,7 +471,7 @@
         # We'll try gcc and clang, but since there is no gcc (gcc-x.y doesn't
         # count), find clang.
         paths = {
-            k: v for k, v in self.PATHS.iteritems()
+            k: v for k, v in self.PATHS.items()
             if os.path.basename(k) not in ('gcc', 'g++')
         }
         self.do_toolchain_test(paths, {
@@ -506,7 +506,7 @@
         # Even if there are gcc-x.y or clang-x.y compilers available, we
         # don't try them. This could be considered something to improve.
         paths = {
-            k: v for k, v in self.PATHS.iteritems()
+            k: v for k, v in self.PATHS.items()
             if os.path.basename(k) not in ('gcc', 'g++', 'clang', 'clang++')
         }
         self.do_toolchain_test(paths, {
@@ -687,7 +687,7 @@
     def test_not_gcc(self):
         # We won't pick GCC if it's the only thing available.
         paths = {
-            k: v for k, v in self.PATHS.iteritems()
+            k: v for k, v in self.PATHS.items()
             if os.path.basename(k) not in ('clang', 'clang++')
         }
         self.do_toolchain_test(paths, {
@@ -851,7 +851,7 @@
     def test_clang_cl(self):
         # We'll pick clang-cl if msvc can't be found.
         paths = {
-            k: v for k, v in self.PATHS.iteritems()
+            k: v for k, v in self.PATHS.items()
             if os.path.basename(k) != 'cl'
         }
         self.do_toolchain_test(paths, {
@@ -862,7 +862,7 @@
     def test_gcc(self):
         # We'll pick GCC if msvc and clang-cl can't be found.
         paths = {
-            k: v for k, v in self.PATHS.iteritems()
+            k: v for k, v in self.PATHS.items()
             if os.path.basename(k) not in ('cl', 'clang-cl')
         }
         self.do_toolchain_test(paths, {
@@ -881,7 +881,7 @@
     def test_clang(self):
         # We'll pick clang if nothing else is found.
         paths = {
-            k: v for k, v in self.PATHS.iteritems()
+            k: v for k, v in self.PATHS.items()
             if os.path.basename(k) not in ('cl', 'clang-cl', 'gcc')
         }
         self.do_toolchain_test(paths, {
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_toolchain_helpers.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_toolchain_helpers.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import copy
 import re
@@ -10,7 +10,7 @@
 import unittest
 
 from fnmatch import fnmatch
-from StringIO import StringIO
+from io import StringIO
 from textwrap import dedent
 
 from mozunit import (
@@ -43,7 +43,7 @@
         # Hack around it enough that the configure tests work properly.
         context = self.context
         def normalize_numbers(value):
-            if isinstance(value, types.StringTypes):
+            if isinstance(value, (str,)):
                 if value[-1:] == 'L' and value[:-1].isdigit():
                     value = int(value[:-1])
             return value
@@ -53,7 +53,7 @@
             return self.HAS_FEATURE.sub(r'\1\2', expr)
         self.context = self.Context(
             (normalize_has_feature(k), normalize_numbers(v))
-            for k, v in context.iteritems()
+            for k, v in context.items()
         )
         try:
             return Preprocessor.do_if(self, normalize_has_feature(expression),
@@ -95,7 +95,7 @@
         input.name = 'foo'
         pp.do_include(input)
 
-        self.assertEquals(pp.out.getvalue(), '1 . 2 . c "D"')
+        self.assertEqual(pp.out.getvalue(), '1 . 2 . c "D"')
 
     def test_condition(self):
         pp = CompilerPreprocessor({
@@ -125,7 +125,7 @@
         input.name = 'foo'
         pp.do_include(input)
 
-        self.assertEquals('IFDEF_A\nIF_A\nIF_B\nIF_NOT_C\n', pp.out.getvalue())
+        self.assertEqual('IFDEF_A\nIF_A\nIF_B\nIF_NOT_C\n', pp.out.getvalue())
 
 
 class FakeCompiler(dict):
@@ -164,9 +164,9 @@
     '''
     def __init__(self, *definitions):
         for definition in definitions:
-            if all(not isinstance(d, dict) for d in definition.itervalues()):
+            if all(not isinstance(d, dict) for d in definition.values()):
                 definition = {None: definition}
-            for key, value in definition.iteritems():
+            for key, value in definition.items():
                 self.setdefault(key, {}).update(value)
 
     def __call__(self, stdin, args):
@@ -178,14 +178,14 @@
             pp = CompilerPreprocessor(self[None])
 
             def apply_defn(defn):
-                for k, v in defn.iteritems():
+                for k, v in defn.items():
                     if v is False:
                         if k in pp.context:
                             del pp.context[k]
                     else:
                         pp.context[k] = v
 
-            for glob, defn in self.iteritems():
+            for glob, defn in self.items():
                 if glob and not glob.startswith('-') and fnmatch(file, glob):
                     apply_defn(defn)
 
@@ -216,7 +216,7 @@
                 'A': '1',
                 'B': '2',
             })
-            self.assertEquals(compiler(None, ['-E', 'file']),
+            self.assertEqual(compiler(None, ['-E', 'file']),
                               (0, '1 2 C', ''))
 
             compiler = FakeCompiler({
@@ -238,25 +238,25 @@
                     'B': '42',
                 },
             })
-            self.assertEquals(compiler(None, ['-E', 'file']),
+            self.assertEqual(compiler(None, ['-E', 'file']),
                               (0, '1 2 C', ''))
-            self.assertEquals(compiler(None, ['-E', '-foo', 'file']),
+            self.assertEqual(compiler(None, ['-E', '-foo', 'file']),
                               (0, '1 2 foo', ''))
-            self.assertEquals(compiler(None, ['-E', '-bar', 'file']),
+            self.assertEqual(compiler(None, ['-E', '-bar', 'file']),
                               (0, '1 bar bar', ''))
-            self.assertEquals(compiler(None, ['-E', '-qux', 'file']),
+            self.assertEqual(compiler(None, ['-E', '-qux', 'file']),
                               (0, '1 B C', ''))
-            self.assertEquals(compiler(None, ['-E', '-foo', '-bar', 'file']),
+            self.assertEqual(compiler(None, ['-E', '-foo', '-bar', 'file']),
                               (0, '1 bar bar', ''))
-            self.assertEquals(compiler(None, ['-E', '-bar', '-foo', 'file']),
+            self.assertEqual(compiler(None, ['-E', '-bar', '-foo', 'file']),
                               (0, '1 bar foo', ''))
-            self.assertEquals(compiler(None, ['-E', '-bar', '-qux', 'file']),
+            self.assertEqual(compiler(None, ['-E', '-bar', '-qux', 'file']),
                               (0, '1 B bar', ''))
-            self.assertEquals(compiler(None, ['-E', '-qux', '-bar', 'file']),
+            self.assertEqual(compiler(None, ['-E', '-qux', '-bar', 'file']),
                               (0, '1 bar bar', ''))
-            self.assertEquals(compiler(None, ['-E', 'file.c']),
+            self.assertEqual(compiler(None, ['-E', 'file.c']),
                               (0, '1 42 C', ''))
-            self.assertEquals(compiler(None, ['-E', '-bar', 'file.c']),
+            self.assertEqual(compiler(None, ['-E', '-bar', 'file.c']),
                               (0, '1 bar bar', ''))
 
     def test_multiple_definitions(self):
@@ -267,7 +267,7 @@
             'C': 3,
         })
 
-        self.assertEquals(compiler, {
+        self.assertEqual(compiler, {
             None: {
                 'A': 1,
                 'B': 2,
@@ -282,7 +282,7 @@
             'C': 3,
         })
 
-        self.assertEquals(compiler, {
+        self.assertEqual(compiler, {
             None: {
                 'A': 1,
                 'B': 4,
@@ -302,7 +302,7 @@
             },
         })
 
-        self.assertEquals(compiler, {
+        self.assertEqual(compiler, {
             None: {
                 'A': 1,
                 'B': 4,
@@ -330,7 +330,7 @@
             },
         })
 
-        self.assertEquals(compiler, {
+        self.assertEqual(compiler, {
             None: {
                 'A': 1,
                 'B': 2,
@@ -370,7 +370,7 @@
     def __add__(self, other):
         assert isinstance(other, dict)
         result = copy.deepcopy(self.__dict__)
-        for k, v in other.iteritems():
+        for k, v in other.items():
             if k == 'flags':
                 result.setdefault(k, []).extend(v)
             else:
@@ -381,7 +381,7 @@
 class TestCompilerResult(unittest.TestCase):
     def test_compiler_result(self):
         result = CompilerResult()
-        self.assertEquals(result.__dict__, {
+        self.assertEqual(result.__dict__, {
             'wrapper': [],
             'compiler': mozpath.abspath(''),
             'version': '',
@@ -397,7 +397,7 @@
             language='C',
             flags=['-std=gnu99'],
         )
-        self.assertEquals(result.__dict__, {
+        self.assertEqual(result.__dict__, {
             'wrapper': [],
             'compiler': mozpath.abspath('/usr/bin/gcc'),
             'version': '4.2.1',
@@ -407,7 +407,7 @@
         })
 
         result2 = result + {'flags': ['-m32']}
-        self.assertEquals(result2.__dict__, {
+        self.assertEqual(result2.__dict__, {
             'wrapper': [],
             'compiler': mozpath.abspath('/usr/bin/gcc'),
             'version': '4.2.1',
@@ -416,14 +416,14 @@
             'flags': ['-std=gnu99', '-m32'],
         })
         # Original flags are untouched.
-        self.assertEquals(result.flags, ['-std=gnu99'])
+        self.assertEqual(result.flags, ['-std=gnu99'])
 
         result3 = result + {
             'compiler': '/usr/bin/gcc-4.7',
             'version': '4.7.3',
             'flags': ['-m32'],
         }
-        self.assertEquals(result3.__dict__, {
+        self.assertEqual(result3.__dict__, {
             'wrapper': [],
             'compiler': mozpath.abspath('/usr/bin/gcc-4.7'),
             'version': '4.7.3',
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import os
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_util.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/configure/test_util.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 import logging
 import os
@@ -11,7 +11,7 @@
 import unittest
 import sys
 
-from StringIO import StringIO
+from io import StringIO
 
 from mozunit import main
 from mozpack import path as mozpath
@@ -434,11 +434,11 @@
         except SystemExit as e:
             status = e.code
 
-        self.assertEquals(status, 0)
+        self.assertEqual(status, 0)
         quote_char = "'"
         if getpreferredencoding().lower() == 'utf-8':
             quote_char = '\u00B4'.encode('utf-8')
-        self.assertEquals(out.getvalue().strip(), quote_char)
+        self.assertEqual(out.getvalue().strip(), quote_char)
 
 
 class TestVersion(unittest.TestCase):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/controller/test_ccachestats.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/controller/test_ccachestats.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import unittest
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/controller/test_clobber.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/controller/test_clobber.py	(refactored)
@@ -2,14 +2,14 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import os
 import shutil
 import tempfile
 import unittest
 
-from StringIO import StringIO
+from io import StringIO
 
 from mozunit import main
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_context.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_context.py	(refactored)
@@ -36,7 +36,7 @@
             'baz': (dict, dict, ''),
         })
 
-        self.assertEqual(test.keys(), [])
+        self.assertEqual(list(test.keys()), [])
 
         self.assertEqual(test['foo'], 0)
 
@@ -84,12 +84,12 @@
             'baz': (dict, list, ''),
         })
 
-        self.assertEqual(test.keys(), [])
+        self.assertEqual(list(test.keys()), [])
 
         with self.assertRaises(ValueError):
             test.update(bar=True, foo={})
 
-        self.assertEqual(test.keys(), [])
+        self.assertEqual(list(test.keys()), [])
 
         test.update(bar=True, foo=1)
 
@@ -258,19 +258,19 @@
         self.assertEqual(lines[-1].strip(), '')
 
     def test_documentation_formatting(self):
-        for typ, inp, doc in VARIABLES.values():
+        for typ, inp, doc in list(VARIABLES.values()):
             self._verify_doc(doc)
 
-        for attr, args, doc in FUNCTIONS.values():
+        for attr, args, doc in list(FUNCTIONS.values()):
             self._verify_doc(doc)
 
-        for func, typ, doc in SPECIAL_VARIABLES.values():
+        for func, typ, doc in list(SPECIAL_VARIABLES.values()):
             self._verify_doc(doc)
 
-        for name, cls in SUBCONTEXTS.items():
+        for name, cls in list(SUBCONTEXTS.items()):
             self._verify_doc(cls.__doc__)
 
-            for name, v in cls.VARIABLES.items():
+            for name, v in list(cls.VARIABLES.items()):
                 self._verify_doc(v[2])
 
 
@@ -631,7 +631,7 @@
 class TestTypedRecord(unittest.TestCase):
 
     def test_fields(self):
-        T = ContextDerivedTypedRecord(('field1', unicode),
+        T = ContextDerivedTypedRecord(('field1', str),
                                       ('field2', list))
         inst = T(None)
         self.assertEqual(inst.field1, '')
@@ -647,7 +647,7 @@
             inst.field3 = []
 
     def test_coercion(self):
-        T = ContextDerivedTypedRecord(('field1', unicode),
+        T = ContextDerivedTypedRecord(('field1', str),
                                       ('field2', list))
         inst = T(None)
         inst.field1 = 3
@@ -673,45 +673,45 @@
     def test_single_bug_component(self):
         c = Context({})
         f = Files(c, pattern='**')
-        f['BUG_COMPONENT'] = (u'Product1', u'Component1')
+        f['BUG_COMPONENT'] = ('Product1', 'Component1')
 
         files = {'moz.build': f}
         self.assertEqual(Files.aggregate(files), {
-            'bug_component_counts': [((u'Product1', u'Component1'), 1)],
-            'recommended_bug_component': (u'Product1', u'Component1'),
+            'bug_component_counts': [(('Product1', 'Component1'), 1)],
+            'recommended_bug_component': ('Product1', 'Component1'),
         })
 
     def test_multiple_bug_components(self):
         c = Context({})
         f1 = Files(c, pattern='**')
-        f1['BUG_COMPONENT'] = (u'Product1', u'Component1')
+        f1['BUG_COMPONENT'] = ('Product1', 'Component1')
 
         f2 = Files(c, pattern='**')
-        f2['BUG_COMPONENT'] = (u'Product2', u'Component2')
+        f2['BUG_COMPONENT'] = ('Product2', 'Component2')
 
         files = {'a': f1, 'b': f2, 'c': f1}
         self.assertEqual(Files.aggregate(files), {
             'bug_component_counts': [
-                ((u'Product1', u'Component1'), 2),
-                ((u'Product2', u'Component2'), 1),
+                (('Product1', 'Component1'), 2),
+                (('Product2', 'Component2'), 1),
             ],
-            'recommended_bug_component': (u'Product1', u'Component1'),
+            'recommended_bug_component': ('Product1', 'Component1'),
         })
 
     def test_no_recommended_bug_component(self):
         """If there is no clear count winner, we don't recommend a bug component."""
         c = Context({})
         f1 = Files(c, pattern='**')
-        f1['BUG_COMPONENT'] = (u'Product1', u'Component1')
+        f1['BUG_COMPONENT'] = ('Product1', 'Component1')
 
         f2 = Files(c, pattern='**')
-        f2['BUG_COMPONENT'] = (u'Product2', u'Component2')
+        f2['BUG_COMPONENT'] = ('Product2', 'Component2')
 
         files = {'a': f1, 'b': f2}
         self.assertEqual(Files.aggregate(files), {
             'bug_component_counts': [
-                ((u'Product1', u'Component1'), 1),
-                ((u'Product2', u'Component2'), 1),
+                (('Product1', 'Component1'), 1),
+                (('Product2', 'Component2'), 1),
             ],
             'recommended_bug_component': None,
         })
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_emitter.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_emitter.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import os
 import unittest
@@ -204,7 +204,7 @@
     def test_use_yasm(self):
         # When yasm is not available, this should raise.
         reader = self.reader('use-yasm')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'yasm is not available'):
             self.read_topsrcdir(reader)
 
@@ -267,25 +267,25 @@
         o = objs[0]
         self.assertIsInstance(o, GeneratedFile)
         self.assertEqual(o.outputs, ('bar.c',))
-        self.assertRegexpMatches(o.script, 'script.py$')
+        self.assertRegex(o.script, 'script.py$')
         self.assertEqual(o.method, 'make_bar')
         self.assertEqual(o.inputs, [])
 
     def test_generated_files_no_script(self):
         reader = self.reader('generated-files-no-script')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'Script for generating bar.c does not exist'):
             self.read_topsrcdir(reader)
 
     def test_generated_files_no_inputs(self):
         reader = self.reader('generated-files-no-inputs')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'Input for generating foo.c does not exist'):
             self.read_topsrcdir(reader)
 
     def test_generated_files_no_python_script(self):
         reader = self.reader('generated-files-no-python-script')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'Script for generating bar.c does not end in .py'):
             self.read_topsrcdir(reader)
 
@@ -314,7 +314,7 @@
         Missing files in EXPORTS is an error.
         '''
         reader = self.reader('exports-missing')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'File listed in EXPORTS does not exist:'):
             self.read_topsrcdir(reader)
 
@@ -323,7 +323,7 @@
         An objdir file in EXPORTS that is not in GENERATED_FILES is an error.
         '''
         reader = self.reader('exports-missing-generated')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'Objdir file listed in EXPORTS not in GENERATED_FILES:'):
             self.read_topsrcdir(reader)
 
@@ -360,7 +360,7 @@
 
     def test_test_harness_files_root(self):
         reader = self.reader('test-harness-files-root')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'Cannot install files to the root of TEST_HARNESS_FILES'):
             self.read_topsrcdir(reader)
 
@@ -413,14 +413,14 @@
         """A missing manifest file should result in an error."""
         reader = self.reader('test-manifest-missing-manifest')
 
-        with self.assertRaisesRegexp(BuildReaderError, 'IOError: Missing files'):
+        with self.assertRaisesRegex(BuildReaderError, 'IOError: Missing files'):
             self.read_topsrcdir(reader)
 
     def test_empty_test_manifest_rejected(self):
         """A test manifest without any entries is rejected."""
         reader = self.reader('test-manifest-empty')
 
-        with self.assertRaisesRegexp(SandboxValidationError, 'Empty test manifest'):
+        with self.assertRaisesRegex(SandboxValidationError, 'Empty test manifest'):
             self.read_topsrcdir(reader)
 
 
@@ -428,7 +428,7 @@
         """A test manifest with no tests but support-files is not supported."""
         reader = self.reader('test-manifest-just-support')
 
-        with self.assertRaisesRegexp(SandboxValidationError, 'Empty test manifest'):
+        with self.assertRaisesRegex(SandboxValidationError, 'Empty test manifest'):
             self.read_topsrcdir(reader)
 
     def test_test_manifest_dupe_support_files(self):
@@ -437,7 +437,7 @@
         """
         reader = self.reader('test-manifest-dupes')
 
-        with self.assertRaisesRegexp(SandboxValidationError, 'bar.js appears multiple times '
+        with self.assertRaisesRegex(SandboxValidationError, 'bar.js appears multiple times '
             'in a test manifest under a support-files field, please omit the duplicate entry.'):
             self.read_topsrcdir(reader)
 
@@ -454,7 +454,7 @@
             mozpath.join(o.install_prefix, "absolute-support.ini"),
             mozpath.join(o.install_prefix, "test_file.js"),
         ]
-        paths = sorted([v[0] for v in o.installs.values()])
+        paths = sorted([v[0] for v in list(o.installs.values())])
         self.assertEqual(paths, expected)
 
     @unittest.skip('Bug 1304316 - Items in the second set but not the first')
@@ -481,7 +481,7 @@
         """A non-existent shared support file reference produces an error."""
         reader = self.reader('test-manifest-shared-missing')
 
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
                                      'entry in support-files not present in the srcdir'):
             self.read_topsrcdir(reader)
 
@@ -500,7 +500,7 @@
             mozpath.normpath(mozpath.join(o.install_prefix, "subdir/support.txt")),
             mozpath.normpath(mozpath.join(o.install_prefix, "subdir/test_foo.html")),
         ]
-        paths = sorted([v[0] for v in o.installs.values()])
+        paths = sorted([v[0] for v in list(o.installs.values())])
         self.assertEqual(paths, expected)
 
     def test_test_manifest_install_includes(self):
@@ -518,7 +518,7 @@
             mozpath.normpath(mozpath.join(o.install_prefix, "subdir/mochitest.ini")),
             mozpath.normpath(mozpath.join(o.install_prefix, "subdir/test_foo.html")),
         ]
-        paths = sorted([v[0] for v in o.installs.values()])
+        paths = sorted([v[0] for v in list(o.installs.values())])
         self.assertEqual(paths, expected)
 
     def test_test_manifest_includes(self):
@@ -541,7 +541,7 @@
     def test_python_unit_test_missing(self):
         """Missing files in PYTHON_UNIT_TESTS should raise."""
         reader = self.reader('test-python-unit-test-missing')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'Path specified in PYTHON_UNIT_TESTS does not exist:'):
             self.read_topsrcdir(reader)
 
@@ -635,7 +635,7 @@
             self.assertEqual(external_normalized, m.get('external', set()))
 
             self.assertEqual(len(o.installs), len(m['installs']))
-            for path in o.installs.keys():
+            for path in list(o.installs.keys()):
                 self.assertTrue(path.startswith(o.directory))
                 relpath = path[len(o.directory)+1:]
 
@@ -648,7 +648,7 @@
     def test_test_manifest_unmatched_generated(self):
         reader = self.reader('test-manifest-unmatched-generated')
 
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'entry in generated-files not present elsewhere'):
             self.read_topsrcdir(reader),
 
@@ -672,7 +672,7 @@
         """Missing test files should result in error."""
         reader = self.reader('test-manifest-missing-test-file')
 
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'lists test that does not exist: test_missing.html'):
             self.read_topsrcdir(reader)
 
@@ -680,7 +680,7 @@
         """Missing test files should result in error, even when the test list is not filtered."""
         reader = self.reader('test-manifest-missing-test-file-unfiltered')
 
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
             'lists test that does not exist: missing.js'):
             self.read_topsrcdir(reader)
 
@@ -794,20 +794,20 @@
             self.assertIsInstance(obj.path, Path)
 
     def test_jar_manifests_multiple_files(self):
-        with self.assertRaisesRegexp(SandboxValidationError, 'limited to one value'):
+        with self.assertRaisesRegex(SandboxValidationError, 'limited to one value'):
             reader = self.reader('jar-manifests-multiple-files')
             self.read_topsrcdir(reader)
 
     def test_xpidl_module_no_sources(self):
         """XPIDL_MODULE without XPIDL_SOURCES should be rejected."""
-        with self.assertRaisesRegexp(SandboxValidationError, 'XPIDL_MODULE '
+        with self.assertRaisesRegex(SandboxValidationError, 'XPIDL_MODULE '
             'cannot be defined'):
             reader = self.reader('xpidl-module-no-sources')
             self.read_topsrcdir(reader)
 
     def test_missing_local_includes(self):
         """LOCAL_INCLUDES containing non-existent directories should be rejected."""
-        with self.assertRaisesRegexp(SandboxValidationError, 'Path specified in '
+        with self.assertRaisesRegex(SandboxValidationError, 'Path specified in '
             'LOCAL_INCLUDES does not exist'):
             reader = self.reader('missing-local-includes')
             self.read_topsrcdir(reader)
@@ -852,7 +852,7 @@
             '.S': ['g.S'],
             '.s': ['h.s', 'i.asm'],
         }
-        for suffix, files in expected.items():
+        for suffix, files in list(expected.items()):
             sources = suffix_map[suffix]
             self.assertEqual(
                 sources.files,
@@ -905,7 +905,7 @@
             '.S': ['g.S'],
             '.s': ['h.s', 'i.asm'],
         }
-        for suffix, files in expected.items():
+        for suffix, files in list(expected.items()):
             sources = suffix_map[suffix]
             self.assertEqual(
                 sources.files,
@@ -931,7 +931,7 @@
             '.c': ['d.c'],
             '.mm': ['e.mm', 'f.mm'],
         }
-        for suffix, files in expected.items():
+        for suffix, files in list(expected.items()):
             sources = suffix_map[suffix]
             self.assertEqual(
                 sources.files,
@@ -956,7 +956,7 @@
             '.mm': ['objc1.mm', 'objc2.mm'],
             '.c': ['c1.c', 'c2.c'],
         }
-        for suffix, files in expected.items():
+        for suffix, files in list(expected.items()):
             sources = suffix_map[suffix]
             self.assertEqual(
                 sources.files,
@@ -982,7 +982,7 @@
             '.mm': ['objc1.mm', 'objc2.mm'],
             '.c': ['c1.c', 'c2.c'],
         }
-        for suffix, files in expected.items():
+        for suffix, files in list(expected.items()):
             sources = suffix_map[suffix]
             self.assertEqual(
                 sources.files,
@@ -1005,11 +1005,11 @@
 
             expected = {'install.rdf', 'main.js'}
             for f in files:
-                self.assertTrue(unicode(f) in expected)
+                self.assertTrue(str(f) in expected)
 
     def test_missing_final_target_pp_files(self):
         """Test that FINAL_TARGET_PP_FILES with missing files throws errors."""
-        with self.assertRaisesRegexp(SandboxValidationError, 'File listed in '
+        with self.assertRaisesRegex(SandboxValidationError, 'File listed in '
             'FINAL_TARGET_PP_FILES does not exist'):
             reader = self.reader('dist-files-missing')
             self.read_topsrcdir(reader)
@@ -1017,49 +1017,49 @@
     def test_final_target_pp_files_non_srcdir(self):
         '''Test that non-srcdir paths in FINAL_TARGET_PP_FILES throws errors.'''
         reader = self.reader('final-target-pp-files-non-srcdir')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'Only source directory paths allowed in FINAL_TARGET_PP_FILES:'):
             self.read_topsrcdir(reader)
 
     def test_rust_library_no_cargo_toml(self):
         '''Test that defining a RustLibrary without a Cargo.toml fails.'''
         reader = self.reader('rust-library-no-cargo-toml')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'No Cargo.toml file found'):
             self.read_topsrcdir(reader)
 
     def test_rust_library_name_mismatch(self):
         '''Test that defining a RustLibrary that doesn't match Cargo.toml fails.'''
         reader = self.reader('rust-library-name-mismatch')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'library.*does not match Cargo.toml-defined package'):
             self.read_topsrcdir(reader)
 
     def test_rust_library_no_lib_section(self):
         '''Test that a RustLibrary Cargo.toml with no [lib] section fails.'''
         reader = self.reader('rust-library-no-lib-section')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'Cargo.toml for.* has no \\[lib\\] section'):
             self.read_topsrcdir(reader)
 
     def test_rust_library_no_profile_section(self):
         '''Test that a RustLibrary Cargo.toml with no [profile] section fails.'''
         reader = self.reader('rust-library-no-profile-section')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'Cargo.toml for.* has no \\[profile\\.dev\\] section'):
             self.read_topsrcdir(reader)
 
     def test_rust_library_invalid_crate_type(self):
         '''Test that a RustLibrary Cargo.toml has a permitted crate-type.'''
         reader = self.reader('rust-library-invalid-crate-type')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'crate-type.* is not permitted'):
             self.read_topsrcdir(reader)
 
     def test_rust_library_non_abort_panic(self):
         '''Test that a RustLibrary Cargo.toml has `panic = "abort" set'''
         reader = self.reader('rust-library-non-abort-panic')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'does not specify `panic = "abort"`'):
             self.read_topsrcdir(reader)
 
@@ -1072,15 +1072,15 @@
         self.assertEqual(len(objs), 1)
         lib = objs[0]
         self.assertIsInstance(lib, RustLibrary)
-        self.assertRegexpMatches(lib.lib_name, "random_crate")
-        self.assertRegexpMatches(lib.import_name, "random_crate")
-        self.assertRegexpMatches(lib.basename, "random-crate")
+        self.assertRegex(lib.lib_name, "random_crate")
+        self.assertRegex(lib.import_name, "random_crate")
+        self.assertRegex(lib.basename, "random-crate")
 
     def test_multiple_rust_libraries(self):
         '''Test that linking multiple Rust libraries throws an error'''
         reader = self.reader('multiple-rust-libraries',
                              extra_substs=dict(RUST_TARGET='i686-pc-windows-msvc'))
-        with self.assertRaisesRegexp(LinkageMultipleRustLibrariesError,
+        with self.assertRaisesRegex(LinkageMultipleRustLibrariesError,
              'Cannot link multiple Rust libraries'):
             self.read_topsrcdir(reader)
 
@@ -1107,7 +1107,7 @@
             mozpath.join(reader.config.topobjdir, 'dir2'),
             '/dir3',
         ]
-        self.assertEquals([p.full_path for p in objs[0].paths], expected)
+        self.assertEqual([p.full_path for p in objs[0].paths], expected)
 
     def test_binary_components(self):
         """Test that IS_COMPONENT/NO_COMPONENTS_MANIFEST work properly."""
@@ -1163,7 +1163,7 @@
         from GENERATED_FILES is an error.
         """
         reader = self.reader('test-symbols-file-objdir-missing-generated')
-        with self.assertRaisesRegexp(SandboxValidationError,
+        with self.assertRaisesRegex(SandboxValidationError,
              'Objdir file specified in SYMBOLS_FILE not in GENERATED_FILES:'):
             self.read_topsrcdir(reader)
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_namespaces.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_namespaces.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import unittest
 
@@ -29,7 +29,7 @@
 
 class Piyo(ContextDerivedValue):
     def __init__(self, context, value):
-        if not isinstance(value, unicode):
+        if not isinstance(value, str):
             raise ValueError
         self.context = context
         self.value = value
@@ -48,9 +48,9 @@
 
 
 VARIABLES = {
-    'HOGE': (unicode, unicode, None),
-    'FUGA': (Fuga, unicode, None),
-    'PIYO': (Piyo, unicode, None),
+    'HOGE': (str, str, None),
+    'FUGA': (Fuga, str, None),
+    'PIYO': (Piyo, str, None),
     'HOGERA': (ContextDerivedTypedList(Piyo, StrictOrderingOnAppendList),
         list, None),
     'HOGEHOGE': (ContextDerivedTypedListWithItems(
@@ -104,7 +104,7 @@
         self.assertEqual(e[1], 'set_type')
         self.assertEqual(e[2], 'HOGE')
         self.assertEqual(e[3], True)
-        self.assertEqual(e[4], unicode)
+        self.assertEqual(e[4], str)
 
     def test_key_checking(self):
         # Checking for existence of a key should not populate the key if it
@@ -127,7 +127,7 @@
         self.assertEqual(e[1], 'set_type')
         self.assertEqual(e[2], 'FUGA')
         self.assertEqual(e[3], False)
-        self.assertEqual(e[4], unicode)
+        self.assertEqual(e[4], str)
 
         ns['FUGA'] = 'fuga'
         self.assertIsInstance(ns['FUGA'], Fuga)
@@ -150,7 +150,7 @@
         self.assertEqual(e[1], 'set_type')
         self.assertEqual(e[2], 'PIYO')
         self.assertEqual(e[3], False)
-        self.assertEqual(e[4], unicode)
+        self.assertEqual(e[4], str)
 
         ns['PIYO'] = 'piyo'
         self.assertIsInstance(ns['PIYO'], Piyo)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_reader.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_reader.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import os
 import sys
@@ -423,7 +423,7 @@
             'simple/base.cpp',
         ])
 
-        for path, pattern_set in expected.items():
+        for path, pattern_set in list(expected.items()):
             self.assertEqual(v[path].test_files,
                              expected[path])
 
@@ -438,7 +438,7 @@
                                       'default/tests/reftests/**']),
         }
 
-        for path, pattern_set in expected.items():
+        for path, pattern_set in list(expected.items()):
             self.assertEqual(v[path].test_files,
                              expected[path])
 
@@ -454,7 +454,7 @@
             'tagged/src/bar.jsm': set(['tagged/**.js']),
         }
 
-        for path, pattern_set in expected_patterns.items():
+        for path, pattern_set in list(expected_patterns.items()):
             self.assertEqual(v[path].test_files,
                              expected_patterns[path])
 
@@ -462,7 +462,7 @@
             'tagged/src/submodule/foo.js': set(['submodule']),
             'tagged/src/bar.jsm': set([]),
         }
-        for path, pattern_set in expected_tags.items():
+        for path, pattern_set in list(expected_tags.items()):
             self.assertEqual(v[path].test_tags,
                              expected_tags[path])
 
@@ -470,7 +470,7 @@
             'tagged/src/bar.jsm': set(['browser-chrome']),
             'tagged/src/submodule/foo.js': set([]),
         }
-        for path, pattern_set in expected_flavors.items():
+        for path, pattern_set in list(expected_flavors.items()):
             self.assertEqual(v[path].test_flavors,
                              expected_flavors[path])
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_sandbox.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/test/frontend/test_sandbox.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import os
 import shutil
@@ -345,7 +345,7 @@
         sandbox = MozbuildSandbox(Context(VARIABLES, config))
 
         self.assertEqual(sandbox['CONFIG']['BAD_UTF8'],
-            u'\ufffd\ufffd\ufffd\ufffd:')
+            '\ufffd\ufffd\ufffd\ufffd:')
 
     def test_invalid_exports_set_base(self):
         sandbox = self.sandbox()
@@ -525,7 +525,7 @@
             source = 'a = foo(1, 2)'
             sandbox.exec_source(source, 'foo.mozbuild')
 
-            self.assertEquals(sandbox['a'], (Foo, int))
+            self.assertEqual(sandbox['a'], (Foo, int))
         finally:
             del FUNCTIONS['foo']
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/archive.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/archive.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import bz2
 import gzip
--- firefox-52.9.0esr/python/mozbuild/mozpack/copier.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/copier.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import os
 import stat
@@ -109,7 +109,7 @@
         '''
         Return all paths stored in the container, in the order they were added.
         '''
-        return self._files.keys()
+        return list(self._files.keys())
 
     def __len__(self):
         '''
@@ -142,7 +142,7 @@
             for path, file in registry:
                 (...)
         '''
-        return self._files.iteritems()
+        return iter(self._files.items())
 
     def required_directories(self):
         '''
@@ -151,7 +151,7 @@
         unspecified (virtual) root directory (and do not include said root
         directory).
         '''
-        return set(k for k, v in self._required_directories.items() if v > 0)
+        return set(k for k, v in list(self._required_directories.items()) if v > 0)
 
 
 class FileRegistrySubtree(object):
@@ -263,7 +263,7 @@
 
         Returns a FileCopyResult that details what changed.
         '''
-        assert isinstance(destination, basestring)
+        assert isinstance(destination, str)
         assert not os.path.exists(destination) or os.path.isdir(destination)
 
         result = FileCopyResult()
@@ -531,7 +531,7 @@
             def exists(self):
                 return self.deflater is not None
 
-        if isinstance(dest, basestring):
+        if isinstance(dest, str):
             dest = Dest(dest)
         assert isinstance(dest, Dest)
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/errors.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/errors.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import sys
 from contextlib import contextmanager
@@ -97,7 +97,7 @@
             if self._count is None:
                 raise ErrorMessage(msg)
             self._count += 1
-        print >>self.out, msg
+        print(msg, file=self.out)
 
     def fatal(self, msg):
         self._handle(self.FATAL, msg)
--- firefox-52.9.0esr/python/mozbuild/mozpack/executables.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/executables.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import os
 import struct
--- firefox-52.9.0esr/python/mozbuild/mozpack/files.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/files.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import errno
 import os
@@ -57,7 +57,7 @@
 
     def _copyfile(src, dest):
         # False indicates `dest` should be overwritten if it exists already.
-        if isinstance(src, unicode) and isinstance(dest, unicode):
+        if isinstance(src, str) and isinstance(dest, str):
             _CopyFileW(src, dest, False)
         elif isinstance(src, str) and isinstance(dest, str):
             _CopyFileA(src, dest, False)
@@ -145,13 +145,13 @@
         # - keep file type (e.g. S_IFREG)
         ret = stat.S_IFMT(mode)
         # - expand user read and execute permissions to everyone
-        if mode & 0400:
-            ret |= 0444
-        if mode & 0100:
-            ret |= 0111
+        if mode & 0o400:
+            ret |= 0o444
+        if mode & 0o100:
+            ret |= 0o111
         # - keep user write permissions
-        if mode & 0200:
-            ret |= 0200
+        if mode & 0o200:
+            ret |= 0o200
         # - leave away sticky bit, setuid, setgid
         return ret
 
@@ -164,7 +164,7 @@
         disabled when skip_if_older is False.
         Returns whether a copy was actually performed (True) or not (False).
         '''
-        if isinstance(dest, basestring):
+        if isinstance(dest, str):
             dest = Dest(dest)
         else:
             assert isinstance(dest, Dest)
@@ -258,11 +258,11 @@
     '''
     def copy(self, dest, skip_if_older=True):
         real_dest = dest
-        if not isinstance(dest, basestring):
+        if not isinstance(dest, str):
             fd, dest = mkstemp()
             os.close(fd)
             os.remove(dest)
-        assert isinstance(dest, basestring)
+        assert isinstance(dest, str)
         # If File.copy didn't actually copy because dest is newer, check the
         # file sizes. If dest is smaller, it means it is already stripped and
         # elfhacked, so we can skip.
@@ -299,7 +299,7 @@
         File.__init__(self, path)
 
     def copy(self, dest, skip_if_older=True):
-        assert isinstance(dest, basestring)
+        assert isinstance(dest, str)
 
         # The logic in this function is complicated by the fact that symlinks
         # aren't universally supported. So, where symlinks aren't supported, we
@@ -400,7 +400,7 @@
         self.required = required
 
     def copy(self, dest, skip_if_older=True):
-        if isinstance(dest, basestring):
+        if isinstance(dest, str):
             dest = Dest(dest)
         else:
             assert isinstance(dest, Dest)
@@ -432,7 +432,7 @@
         '''
         Invokes the preprocessor to create the destination file.
         '''
-        if isinstance(dest, basestring):
+        if isinstance(dest, str):
             dest = Dest(dest)
         else:
             assert isinstance(dest, Dest)
@@ -563,7 +563,7 @@
         the individual XPTs to link.
         skip_if_older is ignored.
         '''
-        if isinstance(dest, basestring):
+        if isinstance(dest, str):
             dest = Dest(dest)
         assert isinstance(dest, Dest)
 
@@ -1014,7 +1014,7 @@
         from mozpack.copier import FileRegistry
         self.files = FileRegistry()
 
-        for base, finder in sorted(finders.iteritems()):
+        for base, finder in sorted(finders.items()):
             if self.files.contains(base):
                 self.files.remove(base)
             for p, f in finder.find(''):
--- firefox-52.9.0esr/python/mozbuild/mozpack/hg.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/hg.py	(refactored)
@@ -27,7 +27,7 @@
 # do not wish to do so, delete this exception statement from your
 # version.
 
-from __future__ import absolute_import
+
 
 import mercurial.error as error
 import mercurial.hg as hg
@@ -56,7 +56,7 @@
 
         Accepts a Mercurial localrepo and changectx instance.
         """
-        if isinstance(repo, (str, unicode)):
+        if isinstance(repo, str):
             path = repo
             repo = hg.repository(hgui.ui(), repo)
         else:
@@ -85,7 +85,7 @@
         return self._get(path)
 
     def _get(self, path):
-        if isinstance(path, unicode):
+        if isinstance(path, str):
             path = path.encode('utf-8', 'replace')
 
         try:
--- firefox-52.9.0esr/python/mozbuild/mozpack/manifests.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/manifests.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import, unicode_literals
+
 
 from contextlib import contextmanager
 import json
--- firefox-52.9.0esr/python/mozbuild/mozpack/mozjar.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/mozjar.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 from io import BytesIO
 import struct
@@ -13,8 +13,9 @@
     ZIP_DEFLATED,
 )
 from collections import OrderedDict
-from urlparse import urlparse, ParseResult
+from urllib.parse import urlparse, ParseResult
 import mozpack.path as mozpath
+from functools import reduce
 
 JAR_STORED = ZIP_STORED
 JAR_DEFLATED = ZIP_DEFLATED
@@ -68,7 +69,7 @@
         an instance with empty fields.
         '''
         assert self.MAGIC and isinstance(self.STRUCT, OrderedDict)
-        self.size_fields = set(t for t in self.STRUCT.itervalues()
+        self.size_fields = set(t for t in self.STRUCT.values()
                                if not t in JarStruct.TYPE_MAPPING)
         self._values = {}
         if data:
@@ -90,7 +91,7 @@
         # For all fields used as other fields sizes, keep track of their value
         # separately.
         sizes = dict((t, 0) for t in self.size_fields)
-        for name, t in self.STRUCT.iteritems():
+        for name, t in self.STRUCT.items():
             if t in JarStruct.TYPE_MAPPING:
                 value, size = JarStruct.get_data(t, data[offset:])
             else:
@@ -109,7 +110,7 @@
         Initialize an instance with empty fields.
         '''
         self.signature = self.MAGIC
-        for name, t in self.STRUCT.iteritems():
+        for name, t in self.STRUCT.items():
             if name in self.size_fields:
                 continue
             self._values[name] = 0 if t in JarStruct.TYPE_MAPPING else ''
@@ -134,9 +135,9 @@
         from self.STRUCT.
         '''
         serialized = struct.pack('<I', self.signature)
-        sizes = dict((t, name) for name, t in self.STRUCT.iteritems()
+        sizes = dict((t, name) for name, t in self.STRUCT.items()
                      if not t in JarStruct.TYPE_MAPPING)
-        for name, t in self.STRUCT.iteritems():
+        for name, t in self.STRUCT.items():
             if t in JarStruct.TYPE_MAPPING:
                 format, size = JarStruct.TYPE_MAPPING[t]
                 if name in sizes:
@@ -155,7 +156,7 @@
         variable length fields.
         '''
         size = JarStruct.TYPE_MAPPING['uint32'][1]
-        for name, type in self.STRUCT.iteritems():
+        for name, type in self.STRUCT.items():
             if type in JarStruct.TYPE_MAPPING:
                 size += JarStruct.TYPE_MAPPING[type][1]
             else:
@@ -176,7 +177,7 @@
         return key in self._values
 
     def __iter__(self):
-        return self._values.iteritems()
+        return iter(self._values.items())
 
     def __repr__(self):
         return "<%s %s>" % (self.__class__.__name__,
@@ -374,7 +375,7 @@
             preload = JarStruct.get_data('uint32', self._data)[0]
         entries = OrderedDict()
         offset = self._cdir_end['cdir_offset']
-        for e in xrange(self._cdir_end['cdir_entries']):
+        for e in range(self._cdir_end['cdir_entries']):
             entry = JarCdirEntry(self._data[offset:])
             offset += entry.size
             # Creator host system. 0 is MSDOS, 3 is Unix
@@ -385,7 +386,7 @@
             xattr = entry['external_attr']
             # Skip directories
             if (host == 0 and xattr & 0x10) or (host == 3 and
-                                                xattr & (040000 << 16)):
+                                                xattr & (0o40000 << 16)):
                 continue
             entries[entry['filename']] = entry
             if entry['offset'] < preload:
@@ -436,7 +437,7 @@
             for file in jarReader:
                 ...
         '''
-        for entry in self.entries.itervalues():
+        for entry in self.entries.values():
             yield self._getreader(entry)
 
     def __getitem__(self, name):
@@ -529,7 +530,7 @@
         headers = {}
         preload_size = 0
         # Prepare central directory entries
-        for entry, content in self._contents.itervalues():
+        for entry, content in self._contents.values():
             header = JarLocalFileHeader()
             for name in entry.STRUCT:
                 if name in header:
@@ -544,7 +545,7 @@
         end['disk_entries'] = len(self._contents)
         end['cdir_entries'] = end['disk_entries']
         end['cdir_size'] = reduce(lambda x, y: x + y[0].size,
-                                  self._contents.values(), 0)
+                                  list(self._contents.values()), 0)
         # On optimized archives, store the preloaded size and the central
         # directory entries, followed by the first end of central directory.
         if self._optimize:
@@ -553,18 +554,18 @@
             if preload_size:
                 preload_size += offset
             self._data.write(struct.pack('<I', preload_size))
-            for entry, _ in self._contents.itervalues():
+            for entry, _ in self._contents.values():
                 entry['offset'] += offset
                 self._data.write(entry.serialize())
             self._data.write(end.serialize())
         # Store local file entries followed by compressed data
-        for entry, content in self._contents.itervalues():
+        for entry, content in self._contents.values():
             self._data.write(headers[entry].serialize())
             self._data.write(content)
         # On non optimized archives, store the central directory entries.
         if not self._optimize:
             end['cdir_offset'] = offset
-            for entry, _ in self._contents.itervalues():
+            for entry, _ in self._contents.values():
                 self._data.write(entry.serialize())
         # Store the end of central directory.
         self._data.write(end.serialize())
@@ -599,7 +600,7 @@
             deflater = data
         else:
             deflater = Deflater(compress, compress_level=self._compress_level)
-            if isinstance(data, basestring):
+            if isinstance(data, str):
                 deflater.write(data)
             elif hasattr(data, 'read'):
                 if hasattr(data, 'seek'):
@@ -615,7 +616,7 @@
             # Set creator host system (upper byte of creator_version)
             # to 3 (Unix) so mode is honored when there is one.
             entry['creator_version'] |= 3 << 8
-            entry['external_attr'] = (mode & 0xFFFF) << 16L
+            entry['external_attr'] = (mode & 0xFFFF) << 16
         if deflater.compressed:
             entry['min_version'] = 20  # Version 2.0 supports deflated streams
             entry['general_flag'] = 2  # Max compression
--- firefox-52.9.0esr/python/mozbuild/mozpack/path.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/path.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import posixpath
 import os
--- firefox-52.9.0esr/python/mozbuild/mozpack/unify.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/unify.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 from mozpack.files import (
     BaseFinder,
@@ -73,7 +73,7 @@
         creating the instance.
         skip_if_older is ignored.
         '''
-        assert isinstance(dest, basestring)
+        assert isinstance(dest, str)
         tmpfiles = []
         try:
             for e in self._executables:
--- firefox-52.9.0esr/python/mozbuild/mozpack/chrome/flags.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/chrome/flags.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import re
 from distutils.version import LooseVersion
@@ -250,7 +250,7 @@
             flags.match(application='foo', appversion='3.5') returns True
             flags.match(application='foo', appversion='3.0') returns False
         '''
-        for name, value in filter.iteritems():
+        for name, value in filter.items():
             if not name in self:
                 continue
             if not self[name].matches(value):
--- firefox-52.9.0esr/python/mozbuild/mozpack/chrome/manifest.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/chrome/manifest.py	(refactored)
@@ -2,11 +2,11 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import re
 import os
-from urlparse import urlparse
+from urllib.parse import urlparse
 import mozpack.path as mozpath
 from mozpack.chrome.flags import Flags
 from mozpack.errors import errors
@@ -321,7 +321,7 @@
         return self.serialize(self.contractID, self.cid)
 
 # All manifest classes by their type name.
-MANIFESTS_TYPES = dict([(c.type, c) for c in globals().values()
+MANIFESTS_TYPES = dict([(c.type, c) for c in list(globals().values())
                        if type(c) == type and issubclass(c, ManifestEntry)
                        and hasattr(c, 'type') and c.type])
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/packager/__init__.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/packager/__init__.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 from mozbuild.preprocessor import Preprocessor
 import re
@@ -50,7 +50,7 @@
         '''
         Split [1, 2, 3, 4, 5, 6, 7] into [(1, 2, 3), (4, 5, 6)].
         '''
-        return zip(*[iter(lst)] * 3)
+        return list(zip(*[iter(lst)] * 3))
 
     KEY_VALUE_RE = re.compile(r'''
         \s*                 # optional whitespace.
@@ -118,7 +118,7 @@
         destdir = options.pop('destdir', '')
         if options:
             errors.fatal('Malformed manifest: options %s not recognized'
-                         % options.keys())
+                         % list(options.keys()))
         return Component(name, destdir=destdir)
 
 
@@ -328,7 +328,7 @@
 
         bases = self.get_bases()
         broken_bases = sorted(
-            m for m, includer in self._included_manifests.iteritems()
+            m for m, includer in self._included_manifests.items()
             if mozpath.basedir(m, bases) != mozpath.basedir(includer, bases))
         for m in broken_bases:
             errors.fatal('"%s" is included from "%s", which is outside "%s"' %
--- firefox-52.9.0esr/python/mozbuild/mozpack/packager/formats.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/packager/formats.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 from mozpack.chrome.manifest import (
     Manifest,
@@ -11,7 +11,7 @@
     ManifestBinaryComponent,
     ManifestResource,
 )
-from urlparse import urlparse
+from urllib.parse import urlparse
 import mozpack.path as mozpath
 from mozpack.files import (
     ManifestFile,
@@ -89,7 +89,7 @@
         Return the deepest base directory containing the given path.
         '''
         self._frozen_bases = True
-        base = mozpath.basedir(path, self._sub_formatter.keys())
+        base = mozpath.basedir(path, list(self._sub_formatter.keys()))
         relpath = mozpath.relpath(path, base) if base else path
         return base, relpath
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/packager/l10n.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/packager/l10n.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 '''
 Replace localized parts of a packaged directory with data from a langpack
@@ -162,7 +162,7 @@
             if not path:
                 continue
         else:
-            base = mozpath.basedir(p, paths.keys())
+            base = mozpath.basedir(p, list(paths.keys()))
             if base:
                 subpath = mozpath.relpath(p, base)
                 path = mozpath.normpath(mozpath.join(paths[base],
@@ -206,7 +206,7 @@
                     formatter.add(p, f)
 
     # Transplant jar preloading information.
-    for path, log in app_finder.jarlogs.iteritems():
+    for path, log in app_finder.jarlogs.items():
         assert isinstance(copier[path], Jarrer)
         copier[path].preload([l.replace(locale, l10n_locale) for l in log])
 
@@ -237,7 +237,7 @@
         finders = {
             '': l10n_finder,
         }
-        for base, path in extra_l10n.iteritems():
+        for base, path in extra_l10n.items():
             finders[base] = UnpackFinder(path)
         l10n_finder = ComposedFinder(finders)
     copier = FileCopier()
--- firefox-52.9.0esr/python/mozbuild/mozpack/packager/unpack.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/packager/unpack.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import mozpack.path as mozpath
 from mozpack.files import (
@@ -27,7 +27,7 @@
     FlatFormatter,
     STARTUP_CACHE_PATHS,
 )
-from urlparse import urlparse
+from urllib.parse import urlparse
 
 
 class UnpackFinder(BaseFinder):
@@ -149,7 +149,7 @@
         if not any(f.compressed for f in jar):
             self.compressed = False
         if jar.last_preloaded:
-            jarlog = jar.entries.keys()
+            jarlog = list(jar.entries.keys())
             self.jarlogs[path] = jarlog[:jarlog.index(jar.last_preloaded) + 1]
         return jar
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_archive.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_archive.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import absolute_import
+
 
 import hashlib
 import os
@@ -69,7 +69,7 @@
         try:
             tp = os.path.join(d, 'test.tar')
             with open(tp, 'wb') as fh:
-                with self.assertRaisesRegexp(ValueError, 'not a regular'):
+                with self.assertRaisesRegex(ValueError, 'not a regular'):
                     create_tar_from_files(fh, {'test': d})
         finally:
             shutil.rmtree(d)
@@ -89,9 +89,9 @@
 
             tp = os.path.join(d, 'test.tar')
             with open(tp, 'wb') as fh:
-                with self.assertRaisesRegexp(ValueError, 'cannot add file with setuid'):
+                with self.assertRaisesRegex(ValueError, 'cannot add file with setuid'):
                     create_tar_from_files(fh, {'test': uid})
-                with self.assertRaisesRegexp(ValueError, 'cannot add file with setuid'):
+                with self.assertRaisesRegex(ValueError, 'cannot add file with setuid'):
                     create_tar_from_files(fh, {'test': gid})
         finally:
             shutil.rmtree(d)
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_chrome_manifest.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_chrome_manifest.py	(refactored)
@@ -24,7 +24,7 @@
     parse_manifest_line,
 )
 from mozpack.errors import errors, AccumulatedErrors
-from test_errors import TestErrors
+from .test_errors import TestErrors
 
 
 class TestManifest(unittest.TestCase):
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_copier.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_copier.py	(refactored)
@@ -127,7 +127,7 @@
             'bar': [],
         }
         reg = FileRegistry()
-        for path, parts in cases.iteritems():
+        for path, parts in cases.items():
             self.assertEqual(reg._partial_paths(path), parts)
 
     def test_file_registry(self):
@@ -414,7 +414,7 @@
         self.assertTrue(stat.S_ISDIR(st.st_mode))
 
         # What's worse, we have no record that dest was created.
-        self.assertEquals(len(result.updated_files), 0)
+        self.assertEqual(len(result.updated_files), 0)
 
         # But we do have an erroneous record of an optional file
         # existing when it does not.
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_errors.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_errors.py	(refactored)
@@ -10,7 +10,7 @@
 import unittest
 import mozunit
 import sys
-from cStringIO import StringIO
+from io import StringIO
 
 
 class TestErrors(object):
@@ -30,14 +30,14 @@
         errors.warn('foo')
         self.assertRaises(ErrorMessage, errors.error, 'foo')
         self.assertRaises(ErrorMessage, errors.fatal, 'foo')
-        self.assertEquals(self.get_output(), ['Warning: foo'])
+        self.assertEqual(self.get_output(), ['Warning: foo'])
 
     def test_ignore_errors(self):
         errors.ignore_errors()
         errors.warn('foo')
         errors.error('bar')
         self.assertRaises(ErrorMessage, errors.fatal, 'foo')
-        self.assertEquals(self.get_output(), ['Warning: foo', 'Warning: bar'])
+        self.assertEqual(self.get_output(), ['Warning: foo', 'Warning: bar'])
 
     def test_no_error(self):
         with errors.accumulate():
@@ -47,14 +47,14 @@
         with self.assertRaises(AccumulatedErrors):
             with errors.accumulate():
                 errors.error('1')
-        self.assertEquals(self.get_output(), ['Error: 1'])
+        self.assertEqual(self.get_output(), ['Error: 1'])
 
     def test_error_loop(self):
         with self.assertRaises(AccumulatedErrors):
             with errors.accumulate():
                 for i in range(3):
                     errors.error('%d' % i)
-        self.assertEquals(self.get_output(),
+        self.assertEqual(self.get_output(),
                           ['Error: 0', 'Error: 1', 'Error: 2'])
 
     def test_multiple_errors(self):
@@ -67,7 +67,7 @@
                     else:
                         errors.error('%d' % i)
                 errors.error('bar')
-        self.assertEquals(self.get_output(),
+        self.assertEqual(self.get_output(),
                           ['Error: foo', 'Error: 0', 'Error: 1',
                            'Warning: 2', 'Error: bar'])
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_files.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_files.py	(refactored)
@@ -61,7 +61,7 @@
 import mozpack.path as mozpath
 from tempfile import mkdtemp
 from io import BytesIO
-from StringIO import StringIO
+from io import StringIO
 from xpt import Typelib
 
 
@@ -146,7 +146,7 @@
         dest.write('qux')
         self.assertEqual(dest.read(), 'qux')
 
-rand = ''.join(random.choice(string.letters) for i in xrange(131597))
+rand = ''.join(random.choice(string.letters) for i in range(131597))
 samples = [
     '',
     'test',
@@ -268,7 +268,7 @@
     def test_absolute_relative(self):
         AbsoluteSymlinkFile('/foo')
 
-        with self.assertRaisesRegexp(ValueError, 'Symlink target not absolute'):
+        with self.assertRaisesRegex(ValueError, 'Symlink target not absolute'):
             AbsoluteSymlinkFile('./foo')
 
     def test_symlink_file(self):
@@ -477,7 +477,7 @@
 
 class TestExistingFile(TestWithTmpDir):
     def test_required_missing_dest(self):
-        with self.assertRaisesRegexp(ErrorMessage, 'Required existing file'):
+        with self.assertRaisesRegex(ErrorMessage, 'Required existing file'):
             f = ExistingFile(required=True)
             f.copy(self.tmppath('dest'))
 
@@ -566,7 +566,7 @@
         with JarWriter(src) as jar:
             for content in samples:
                 name = ''.join(random.choice(string.letters)
-                               for i in xrange(8))
+                               for i in range(8))
                 jar.add(name, content, compress=True)
                 contents[name] = content
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_manifests.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_manifests.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import unicode_literals
+
 
 import os
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_mozjar.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_mozjar.py	(refactored)
@@ -16,8 +16,8 @@
 from mozpack.test.test_files import MockDest
 import unittest
 import mozunit
-from cStringIO import StringIO
-from urllib import pathname2url
+from io import StringIO
+from urllib.request import pathname2url
 import mozpack.path as mozpath
 import os
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_packager_formats.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_packager_formats.py	(refactored)
@@ -128,7 +128,7 @@
                 'foo': read_interfaces(foo2_xpt.open())['foo'],
                 'bar': read_interfaces(bar_xpt.open())['bar'],
             },
-        }.iteritems()
+        }.items()
     })
 
 RESULT_JAR = {
@@ -174,7 +174,7 @@
     },
     'addon1.xpi': {
         mozpath.relpath(p, 'addon1'): f
-        for p, f in RESULT_FLAT.iteritems()
+        for p, f in RESULT_FLAT.items()
         if p.startswith('addon1/')
     },
 })
@@ -234,7 +234,7 @@
 CONTENTS_WITH_BASE = {
     'bases': {
         mozpath.join('base/root', b) if b else 'base/root': a
-        for b, a in CONTENTS['bases'].iteritems()
+        for b, a in CONTENTS['bases'].items()
     },
     'manifests': [
         m.move(mozpath.join('base/root', m.base))
@@ -242,7 +242,7 @@
     ],
     'files': {
         mozpath.join('base/root', p): f
-        for p, f in CONTENTS['files'].iteritems()
+        for p, f in CONTENTS['files'].items()
     },
 }
 
@@ -255,7 +255,7 @@
 def result_with_base(results):
     result = {
         mozpath.join('base/root', p): v
-        for p, v in results.iteritems()
+        for p, v in results.items()
     }
     result.update(EXTRA_CONTENTS)
     return result
@@ -271,13 +271,13 @@
 
 
 def fill_formatter(formatter, contents):
-    for base, is_addon in contents['bases'].items():
+    for base, is_addon in list(contents['bases'].items()):
         formatter.add_base(base, is_addon)
 
     for manifest in contents['manifests']:
         formatter.add_manifest(manifest)
 
-    for k, v in contents['files'].iteritems():
+    for k, v in contents['files'].items():
         if k.endswith('.xpt'):
             formatter.add_interfaces(k, v)
         else:
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_packager_l10n.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_packager_l10n.py	(refactored)
@@ -4,7 +4,7 @@
 
 import unittest
 import mozunit
-from test_packager import MockFinder
+from .test_packager import MockFinder
 from mozpack.packager import l10n
 from mozpack.files import (
     GeneratedFile,
@@ -118,7 +118,7 @@
 
         self.assertEqual(
             dict((p, f.open().read()) for p, f in copier),
-            dict((p, f.open().read()) for p, f in repacked.iteritems())
+            dict((p, f.open().read()) for p, f in repacked.items())
         )
 
 
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/test_unify.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/test_unify.py	(refactored)
@@ -13,7 +13,7 @@
 from mozpack.files import FileFinder
 from mozpack.mozjar import JarWriter
 from mozpack.test.test_files import MockDest
-from cStringIO import StringIO
+from io import StringIO
 import os
 import sys
 from mozpack.errors import (
--- firefox-52.9.0esr/python/mozbuild/mozpack/test/support/minify_js_verify.py	(original)
+++ firefox-52.9.0esr/python/mozbuild/mozpack/test/support/minify_js_verify.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import print_function
+
 import sys
 
 
--- firefox-52.9.0esr/build/moz.configure/keyfiles.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/keyfiles.configure	2018-07-10 07:57:16.030000000 +0000
@@ -16,8 +16,8 @@
 
     @depends('--with-%s-keyfile' % name)
     @checking('for the %s key' % desc, lambda x: x and x is not no_key)
-    @imports(_from='__builtin__', _import='open')
-    @imports(_from='__builtin__', _import='IOError')
+    @imports(_from='builtins', _import='open')
+    @imports(_from='builtins', _import='IOError')
     def keyfile(value):
         if value:
             try:
--- firefox-52.9.0esr/build/moz.configure/windows.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/windows.configure	2018-07-10 07:57:25.210000000 +0000
@@ -19,7 +19,7 @@
 
 
 @depends_win('--with-windows-version')
-@imports(_from='__builtin__', _import='ValueError')
+@imports(_from='builtins', _import='ValueError')
 def valid_windows_version(value):
     if not value:
         die('Cannot build with --without-windows-version')
@@ -56,8 +56,8 @@
 # 8.1.
 @imports('os')
 @imports('re')
-@imports(_from='__builtin__', _import='sorted')
-@imports(_from='__builtin__', _import='WindowsError')
+@imports(_from='builtins', _import='sorted')
+@imports(_from='builtins', _import='WindowsError')
 def get_sdk_dirs(sdk, subdir):
     def get_dirs_containing(sdk, stem, subdir):
         base = os.path.join(sdk, stem)
@@ -102,7 +102,7 @@
 @depends_win(c_compiler, windows_sdk_dir, valid_windows_version,
              'WINDOWSSDKDIR')
 @checking('for Windows SDK', valid_windows_sdk_dir_result)
-@imports(_from='__builtin__', _import='sorted')
+@imports(_from='builtins', _import='sorted')
 @imports(_from='textwrap', _import='dedent')
 def valid_windows_sdk_dir(compiler, windows_sdk_dir, target_version,
                           windows_sdk_dir_env):
@@ -179,7 +179,7 @@
 @depends_win(windows_sdk_dir, 'WINDOWSSDKDIR')
 @checking('for Universal CRT SDK', valid_ucrt_sdk_dir_result)
 @imports('os')
-@imports(_from='__builtin__', _import='sorted')
+@imports(_from='builtins', _import='sorted')
 @imports(_import='mozpack.path', _as='mozpath')
 def valid_ucrt_sdk_dir(windows_sdk_dir, windows_sdk_dir_env):
     if windows_sdk_dir_env:
--- firefox-52.9.0esr/build/moz.configure/toolchain.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/toolchain.configure	2018-07-10 07:57:28.830000000 +0000
@@ -395,7 +395,7 @@
 
 
 @imports(_from='collections', _import='defaultdict')
-@imports(_from='__builtin__', _import='sorted')
+@imports(_from='builtins', _import='sorted')
 def get_vc_paths(base):
     vc = defaultdict(lambda: defaultdict(dict))
     subkey = r'Microsoft\VisualStudio\VC\*\*\*\Compiler'
--- firefox-52.9.0esr/build/moz.configure/util.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/util.configure	2018-07-10 07:57:31.540000000 +0000
@@ -234,7 +234,7 @@
 #     ('19.0', 'x64', r'C:\...\amd64\cl.exe')
 #     ('19.0', 'x86', r'C:\...\amd64_x86\cl.exe')
 @imports(_import='_winreg', _as='winreg')
-@imports(_from='__builtin__', _import='WindowsError')
+@imports(_from='builtins', _import='WindowsError')
 @imports(_from='fnmatch', _import='fnmatch')
 def get_registry_values(pattern):
     def enum_helper(func, key):
--- firefox-52.9.0esr/build/moz.configure/checks.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/checks.configure	2018-07-10 07:57:35.630000000 +0000
@@ -12,7 +12,7 @@
 # _declare_exceptions template, and add it to the return statement. Then
 # destructure in the assignment below the function declaration.
 @template
-@imports(_from='__builtin__', _import='Exception')
+@imports(_from='builtins', _import='Exception')
 def _declare_exceptions():
     class FatalCheckError(Exception):
         '''An exception to throw from a function decorated with @checking.
--- firefox-52.9.0esr/build/moz.configure/old.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/old.configure	2018-07-10 07:57:38.970000000 +0000
@@ -61,8 +61,8 @@
 
 @depends('OLD_CONFIGURE', mozconfig, autoconf, check_build_environment, shell,
          old_configure_assignments, build_project)
-@imports(_from='__builtin__', _import='open')
-@imports(_from='__builtin__', _import='print')
+@imports(_from='builtins', _import='open')
+@imports(_from='builtins', _import='print')
 @imports('glob')
 @imports('itertools')
 @imports('subprocess')
@@ -302,8 +302,8 @@
     '--enable-calendar',
     '--enable-incomplete-external-linkage',
 )
-@imports(_from='__builtin__', _import='compile')
-@imports(_from='__builtin__', _import='open')
+@imports(_from='builtins', _import='compile')
+@imports(_from='builtins', _import='open')
 @imports('logging')
 @imports('os')
 @imports('subprocess')
--- firefox-52.9.0esr/build/moz.configure/android-ndk.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/android-ndk.configure	2018-07-10 07:57:41.120000000 +0000
@@ -22,7 +22,7 @@
           default=min_android_version)
 
 @depends('--with-android-version', min_android_version)
-@imports(_from='__builtin__', _import='ValueError')
+@imports(_from='builtins', _import='ValueError')
 def android_version(value, min_version):
     if not value:
         # Someone has passed --without-android-version.
--- firefox-52.9.0esr/build/moz.configure/init.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/init.configure	2018-07-10 07:57:44.330000000 +0000
@@ -636,7 +636,7 @@
 # - otherwise, if we have "a" in GRE_MILESTONE, we're building Nightly or Aurora
 # - otherwise, we're building Release/Beta (define RELEASE_OR_BETA)
 @depends(check_build_environment, '--help')
-@imports(_from='__builtin__', _import='open')
+@imports(_from='builtins', _import='open')
 def milestone(build_env, _):
     milestone_path = os.path.join(build_env.topsrcdir,
                                   'config',
diff -aur firefox-52.9.0esr/config/mozunit.py mozjs-fixed/config/mozunit.py
--- firefox-52.9.0esr/config/mozunit.py	2017-04-11 02:13:09.000000000 +0000
+++ mozjs-fixed/config/mozunit.py	2018-07-10 08:19:37.770000000 +0000
@@ -5,7 +5,7 @@
 from unittest import TextTestRunner as _TestRunner, TestResult as _TestResult
 import unittest
 import inspect
-from StringIO import StringIO
+from io import StringIO
 import os
 import sys
 
@@ -74,7 +74,7 @@
 
     def printFail(self, test, err):
         exctype, value, tb = err
-        message = value.message.splitlines()[0] if value.message else 'NO MESSAGE'
+        message = str(value).splitlines()[0] if str(value) else 'NO MESSAGE'
         # Skip test runner traceback levels
         while tb and self._is_relevant_tb_level(tb):
             tb = tb.tb_next
diff -aur firefox-52.9.0esr/python/mozbuild/mozbuild/backend/configenvironment.py mozjs-fixed/python/mozbuild/mozbuild/backend/configenvironment.py
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/configenvironment.py	2018-07-10 08:24:43.150000000 +0000
+++ mozjs-fixed/python/mozbuild/mozbuild/backend/configenvironment.py	2018-07-10 08:15:12.650000000 +0000
@@ -8,7 +8,8 @@
 import sys
 
 from collections import Iterable
-from types import StringTypes, ModuleType
+from types import ModuleType
+StringTypes = (str,)
 
 import mozpack.path as mozpath
 
diff -aur firefox-52.9.0esr/python/mozbuild/mozbuild/makeutil.py mozjs-fixed/python/mozbuild/mozbuild/makeutil.py
--- firefox-52.9.0esr/python/mozbuild/mozbuild/makeutil.py	2018-07-10 08:24:43.150000000 +0000
+++ mozjs-fixed/python/mozbuild/mozbuild/makeutil.py	2018-07-10 08:20:05.230000000 +0000
@@ -6,7 +6,6 @@
 
 import os
 import re
-from types import StringTypes
 from collections import Iterable
 
 
@@ -103,19 +102,19 @@
 
     def add_targets(self, targets):
         '''Add additional targets to the rule.'''
-        assert isinstance(targets, Iterable) and not isinstance(targets, StringTypes)
+        assert isinstance(targets, Iterable) and not isinstance(targets, str)
         self._targets.update(targets)
         return self
 
     def add_dependencies(self, deps):
         '''Add dependencies to the rule.'''
-        assert isinstance(deps, Iterable) and not isinstance(deps, StringTypes)
+        assert isinstance(deps, Iterable) and not isinstance(deps, str)
         self._dependencies.update(deps)
         return self
 
     def add_commands(self, commands):
         '''Add commands to the rule.'''
-        assert isinstance(commands, Iterable) and not isinstance(commands, StringTypes)
+        assert isinstance(commands, Iterable) and not isinstance(commands, str)
         self._commands.extend(commands)
         return self
 
diff -aur firefox-52.9.0esr/python/which/which.py mozjs-fixed/python/which/which.py
--- firefox-52.9.0esr/python/which/which.py	2017-04-11 02:13:24.000000000 +0000
+++ mozjs-fixed/python/which/which.py	2018-07-10 08:11:01.570000000 +0000
@@ -280,17 +280,17 @@
     try:
         optlist, args = getopt.getopt(argv[1:], 'haVvqp:e:',
             ['help', 'all', 'version', 'verbose', 'quiet', 'path=', 'exts='])
-    except getopt.GetoptError, msg:
+    except getopt.GetoptError as msg:
         sys.stderr.write("which: error: %s. Your invocation was: %s\n"\
                          % (msg, argv))
         sys.stderr.write("Try 'which --help'.\n")
         return 1
     for opt, optarg in optlist:
         if opt in ('-h', '--help'):
-            print _cmdlnUsage
+            print(_cmdlnUsage)
             return 0
         elif opt in ('-V', '--version'):
-            print "which %s" % __version__
+            print("which %s" % __version__)
             return 0
         elif opt in ('-a', '--all'):
             all = 1
@@ -318,9 +318,9 @@
         nmatches = 0
         for match in whichgen(arg, path=altpath, verbose=verbose, exts=exts):
             if verbose:
-                print "%s (%s)" % match
+                print("%s (%s)" % match)
             else:
-                print match
+                print(match)
             nmatches += 1
             if not all:
                 break
diff -aur firefox-52.9.0esr/testing/mozbase/mozprocess/mozprocess/processhandler.py mozjs-fixed/testing/mozbase/mozprocess/mozprocess/processhandler.py
--- firefox-52.9.0esr/testing/mozbase/mozprocess/mozprocess/processhandler.py	2017-04-11 02:13:06.000000000 +0000
+++ mozjs-fixed/testing/mozbase/mozprocess/mozprocess/processhandler.py	2018-07-10 08:13:15.440000000 +0000
@@ -11,7 +11,7 @@
 import threading
 import time
 import traceback
-from Queue import Queue, Empty
+from queue import Queue, Empty
 from datetime import datetime
 
 __all__ = ['ProcessHandlerMixin', 'ProcessHandler', 'LogOutput',
@@ -121,14 +121,14 @@
             thread = threading.current_thread().name
             print("DBG::MOZPROC PID:{} ({}) | {}".format(self.pid, thread, msg))
 
-        def __del__(self, _maxint=sys.maxint):
+        def __del__(self, _maxint=sys.maxsize):
             if isWin:
                 handle = getattr(self, '_handle', None)
                 if handle:
                     if hasattr(self, '_internal_poll'):
                         self._internal_poll(_deadstate=_maxint)
                     else:
-                        self.poll(_deadstate=sys.maxint)
+                        self.poll(_deadstate=sys.maxsize)
                 if handle or self._job or self._io_port:
                     self._cleanup()
             else:
@@ -267,7 +267,7 @@
                 if not (can_create_job or can_nest_jobs):
                     # Since we've warned, we just log info here to inform you
                     # of the consequence of setting ignore_children = True
-                    print "ProcessManager NOT managing child processes"
+                    print("ProcessManager NOT managing child processes")
 
                 # create the process
                 hp, ht, pid, tid = winprocess.CreateProcess(
@@ -534,11 +534,11 @@
 
                     if rc == winprocess.WAIT_TIMEOUT:
                         # The process isn't dead, so kill it
-                        print "Timed out waiting for process to close, attempting TerminateProcess"
+                        print("Timed out waiting for process to close, attempting TerminateProcess")
                         self.kill()
                     elif rc == winprocess.WAIT_OBJECT_0:
                         # We caught WAIT_OBJECT_0, which indicates all is well
-                        print "Single process terminated successfully"
+                        print("Single process terminated successfully")
                         self.returncode = winprocess.GetExitCodeProcess(self._handle)
                     else:
                         # An error occured we should probably throw
diff -aur firefox-52.9.0esr/build/moz.configure/checks.configure mozjs-fixed/build/moz.configure/checks.configure
--- firefox-52.9.0esr/build/moz.configure/checks.configure	2018-07-10 10:29:50.380000000 +0000
+++ mozjs-fixed/build/moz.configure/checks.configure	2018-07-10 10:27:45.350000000 +0000
@@ -52,7 +52,7 @@
                 try:
                     ret = func(*args, **kwargs)
                 except FatalCheckError as e:
-                    error = e.message
+                    error = str(e)
                 display_ret = callback(ret) if callback else ret
                 if display_ret is True:
                     log.info('yes')
diff -aur firefox-52.9.0esr/build/moz.configure/init.configure mozjs-fixed/build/moz.configure/init.configure
--- firefox-52.9.0esr/build/moz.configure/init.configure	2018-07-10 10:29:50.380000000 +0000
+++ mozjs-fixed/build/moz.configure/init.configure	2018-07-10 10:23:19.960000000 +0000
@@ -213,7 +213,7 @@
     def early_options():
         return set(
             option.env
-            for option in __sandbox__._options.itervalues()
+            for option in list(__sandbox__._options.values())
             if option.env
         )
     return early_options
@@ -297,7 +297,7 @@
     # There is also a quartet form:
     #   CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
     # But we can consider the "KERNEL-OPERATING_SYSTEM" as one.
-    cpu, manufacturer, os = triplet.split('-', 2)
+    cpu, manufacturer, os = triplet.decode('utf-8').split('-', 2)
 
     # Autoconf uses config.sub to validate and canonicalize those triplets,
     # but the granularity of its results has never been satisfying to our
@@ -727,7 +727,7 @@
 def all_configure_options(_):
     result = []
     previous = None
-    for option in __sandbox__._options.itervalues():
+    for option in list(__sandbox__._options.values()):
         # __sandbox__._options contains items for both option.name and
         # option.env. But it's also an OrderedDict, meaning both are
         # consecutive.
diff -aur firefox-52.9.0esr/build/moz.configure/old.configure mozjs-fixed/build/moz.configure/old.configure
--- firefox-52.9.0esr/build/moz.configure/old.configure	2018-07-10 10:29:50.380000000 +0000
+++ mozjs-fixed/build/moz.configure/old.configure	2018-07-10 10:19:19.880000000 +0000
@@ -360,7 +360,7 @@
         # Every variation of the exec() function I tried led to:
         # SyntaxError: unqualified exec is not allowed in function 'main' it
         # contains a nested function with free variables
-        exec code in raw_config
+        exec(code, raw_config)
 
     # Ensure all the flags known to old-configure appear in the
     # @old_configure_options above.
diff -aur firefox-52.9.0esr/build/moz.configure/toolchain.configure mozjs-fixed/build/moz.configure/toolchain.configure
--- firefox-52.9.0esr/build/moz.configure/toolchain.configure	2018-07-10 10:29:50.380000000 +0000
+++ mozjs-fixed/build/moz.configure/toolchain.configure	2018-07-10 10:28:13.020000000 +0000
@@ -244,7 +244,7 @@
         ('CPU', CPU_preprocessor_checks),
         ('KERNEL', kernel_preprocessor_checks),
     ):
-        for n, (value, condition) in enumerate(preprocessor_checks.iteritems()):
+        for n, (value, condition) in enumerate(preprocessor_checks.items()):
             check += dedent('''\
                 #%(if)s %(condition)s
                 %%%(name)s "%(value)s"
@@ -278,9 +278,9 @@
     data = {}
     for line in result.splitlines():
         if line.startswith(b'%'):
-            k, _, v = line.partition(' ')
-            k = k.lstrip('%')
-            data[k] = v.replace(' ', '').lstrip('"').rstrip('"')
+            k, _, v = line.partition(b' ')
+            k = k.lstrip(b'%').decode('utf-8')
+            data[k] = v.replace(b' ', b'').lstrip(b'"').rstrip(b'"').decode('utf-8')
             log.debug('%s = %s', k, data[k])
 
     try:
diff -aur firefox-52.9.0esr/build/moz.configure/util.configure mozjs-fixed/build/moz.configure/util.configure
--- firefox-52.9.0esr/build/moz.configure/util.configure	2018-07-10 10:29:50.380000000 +0000
+++ mozjs-fixed/build/moz.configure/util.configure	2018-07-10 10:23:54.980000000 +0000
@@ -299,6 +299,8 @@
 @imports(_from='mozbuild.configure.util', _import='Version', _as='_Version')
 def Version(v):
     'A version number that can be compared usefully.'
+    if isinstance(v, bytes):
+    	v = v.decode('utf-8')
     return _Version(v)
 
 # Denotes a deprecated option. Combines option() and @depends:
diff -aur firefox-52.9.0esr/python/mozbuild/mozbuild/configure/__init__.py mozjs-fixed/python/mozbuild/mozbuild/configure/__init__.py
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/__init__.py	2018-07-10 10:29:50.350000000 +0000
+++ mozjs-fixed/python/mozbuild/mozbuild/configure/__init__.py	2018-07-10 10:24:33.200000000 +0000
@@ -97,6 +97,9 @@
             ', '.join(repr(d) for d in self.dependencies),
         )
 
+    def __hash__(self):
+        return hash((str(self.func), tuple(self.dependencies), self.when))
+
 
 class CombinedDependsFunction(DependsFunction):
     def __init__(self, sandbox, func, dependencies):
@@ -142,6 +145,9 @@
     def __ne__(self, other):
         return not self == other
 
+    def __hash__(self):
+        return hash((str(self.func), tuple(self.dependencies)))
+
 class SandboxedGlobal(dict):
     '''Identifiable dict type for use as function global'''
 
@@ -192,7 +198,8 @@
         b: __builtins__[b]
         for b in ('None', 'False', 'True', 'int', 'bool', 'any', 'all', 'len',
                   'list', 'tuple', 'set', 'dict', 'isinstance', 'getattr',
-                  'hasattr', 'enumerate', 'range', 'zip')
+                  'hasattr', 'enumerate', 'range', 'zip', '__build_class__',
+                  'bytes', 'exec')
     }, __import__=forbidden_import, str=str)
 
     # Expose a limited set of functions from os.path
@@ -267,7 +274,7 @@
                 return method
             def wrapped(*args, **kwargs):
                 out_args = [
-                    arg.decode(encoding) if isinstance(arg, str) else arg
+                    arg.decode(encoding) if isinstance(arg, bytes) else arg
                     for arg in args
                 ]
                 return method(*out_args, **kwargs)
diff -aur firefox-52.9.0esr/python/mozbuild/mozbuild/configure/options.py mozjs-fixed/python/mozbuild/mozbuild/configure/options.py
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/options.py	2018-07-10 10:29:50.350000000 +0000
+++ mozjs-fixed/python/mozbuild/mozbuild/configure/options.py	2018-07-10 10:15:41.760000000 +0000
@@ -65,6 +65,9 @@
         return '%s%s' % (self.__class__.__name__,
                          super(OptionValue, self).__repr__())
 
+    def __hash__(self):
+        return hash(str(self))
+
 
 class PositiveOptionValue(OptionValue):
     '''Represents the value for a positive option (--enable/--with/--foo)
diff -aur firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py mozjs-fixed/python/mozbuild/mozbuild/configure/util.py
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py	2018-07-10 10:29:50.350000000 +0000
+++ mozjs-fixed/python/mozbuild/mozbuild/configure/util.py	2018-07-10 09:04:28.150000000 +0000
@@ -200,7 +200,7 @@
         self._encoding = getpreferredencoding()
 
     def write(self, buf):
-        if self._encoding and isinstance(buf, str):
+        if self._encoding and isinstance(buf, bytes):
             buf = buf.decode(self._encoding)
         lines = buf.splitlines()
         if not lines:
diff -aur firefox-52.9.0esr/python/mozbuild/mozbuild/virtualenv.py mozjs-fixed/python/mozbuild/mozbuild/virtualenv.py
--- firefox-52.9.0esr/python/mozbuild/mozbuild/virtualenv.py	2018-07-10 10:29:50.350000000 +0000
+++ mozjs-fixed/python/mozbuild/mozbuild/virtualenv.py	2018-07-10 10:11:47.710000000 +0000
@@ -108,7 +108,7 @@
         """
         ver = subprocess.check_output([python, '-c', 'import sys; print(sys.hexversion)']).rstrip()
         with open(self.exe_info_path, 'w') as fh:
-            fh.write("%s\n" % ver)
+            fh.write("%s\n" % ver.decode('utf-8'))
             fh.write("%s\n" % os.path.getsize(python))
 
     def up_to_date(self, python=sys.executable):
@@ -207,7 +207,7 @@
         return self.virtualenv_root
 
     def packages(self):
-        with file(self.manifest_path, 'rU') as fh:
+        with open(self.manifest_path, 'rU') as fh:
             packages = [line.rstrip().split(':')
                         for line in fh]
         return packages
@@ -530,9 +530,9 @@
 
     our = LooseVersion('%d.%d.%d' % (major, minor, micro))
 
-    if major != MINIMUM_PYTHON_MAJOR or our < MINIMUM_PYTHON_VERSION:
-        log_handle.write('Python %s or greater (but not Python 3) is '
-            'required to build. ' % MINIMUM_PYTHON_VERSION)
+    if our < MINIMUM_PYTHON_VERSION:
+        log_handle.write('Python %s or greater is required to build. '
+            % MINIMUM_PYTHON_VERSION)
         log_handle.write('You are running Python %s.\n' % our)
 
         if os.name in ('nt', 'ce'):
diff -aur firefox-52.9.0esr/python/which/which.py mozjs-fixed/python/which/which.py
--- firefox-52.9.0esr/python/which/which.py	2018-07-10 10:29:50.380000000 +0000
+++ mozjs-fixed/python/which/which.py	2018-07-10 10:20:16.770000000 +0000
@@ -243,7 +243,7 @@
     If no match is found for the command, a WhichError is raised.
     """
     try:
-        match = whichgen(command, path, verbose, exts).next()
+        match = next(whichgen(command, path, verbose, exts))
     except StopIteration:
         raise WhichError("Could not find '%s' on the path." % command)
     return match
--- firefox-52.9.0esr/build/moz.configure/old.configure.old	2018-07-10 10:32:48.550000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/old.configure	2018-07-10 10:35:32.440000000 +0000
@@ -107,7 +107,7 @@
 
         # Make old-configure append to config.log, where we put our own log.
         # This could be done with a m4 macro, but it's way easier this way
-        script = script.replace('>./config.log', '>>./config.log')
+        script = script.replace(b'>./config.log', b'>>./config.log')
 
         with open(old_configure, 'wb') as fh:
             fh.write(script)
--- firefox-52.9.0esr/build/subconfigure.py.old	2017-04-11 02:13:09.000000000 +0000
+++ firefox-52.9.0esr/build/subconfigure.py	2018-07-10 10:38:08.910000000 +0000
@@ -27,7 +27,7 @@
             return super(Pool, cls).__new__(cls)
 
     def imap_unordered(self, fn, iterable):
-        return itertools.imap(fn, iterable)
+        return map(fn, iterable)
 
     def close(self):
         pass
@@ -131,11 +131,11 @@
         is_set = cache.get('ac_cv_env_%s_set' % precious) == 'set'
         value = cache.get('ac_cv_env_%s_value' % precious) if is_set else None
         if value != env.get(precious):
-            print 'Removing %s because of %s value change from:' \
-                % (data['cache-file'], precious)
-            print '  %s' % (value if value is not None else 'undefined')
-            print 'to:'
-            print '  %s' % env.get(precious, 'undefined')
+            print('Removing %s because of %s value change from:' \
+                % (data['cache-file'], precious))
+            print('  %s' % (value if value is not None else 'undefined'))
+            print('to:')
+            print('  %s' % env.get(precious, 'undefined'))
             os.remove(data['cache-file'])
             return True
     return False
@@ -333,8 +333,8 @@
         # We're going to run it ourselves.
         command += ['--no-create']
 
-        print prefix_lines('configuring', relobjdir)
-        print prefix_lines('running %s' % ' '.join(command[:-1]), relobjdir)
+        print(prefix_lines('configuring', relobjdir))
+        print(prefix_lines('running %s' % ' '.join(command[:-1]), relobjdir))
         sys.stdout.flush()
         try:
             output += subprocess.check_output(command,
@@ -368,7 +368,7 @@
 
     if not skip_config_status:
         if skip_configure:
-            print prefix_lines('running config.status', relobjdir)
+            print(prefix_lines('running config.status', relobjdir))
             sys.stdout.flush()
         try:
             output += subprocess.check_output([data['shell'], '-c',
@@ -410,7 +410,7 @@
     pool = Pool(len(subconfigures))
     for relobjdir, returncode, output in \
             pool.imap_unordered(run, subconfigures):
-        print prefix_lines(output, relobjdir)
+        print(prefix_lines(output, relobjdir))
         sys.stdout.flush()
         ret = max(returncode, ret)
         if ret:
--- firefox-52.9.0esr/build/moz.configure/old.configure.old	2018-07-10 10:38:53.530000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/old.configure	2018-07-10 10:41:32.560000000 +0000
@@ -394,7 +394,7 @@
 def post_old_configure(raw_config):
     for k, v in raw_config['substs']:
         set_old_configure_config(
-            k[1:-1], v[1:-1] if isinstance(v, types.StringTypes) else v)
+            k[1:-1], v[1:-1] if isinstance(v, str) else v)
 
-    for k, v in dict(raw_config['defines']).iteritems():
+    for k, v in dict(raw_config['defines']).items():
         set_old_configure_define(k[1:-1], v[1:-1])
--- firefox-52.9.0esr/configure.py	(original)
+++ firefox-52.9.0esr/configure.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from __future__ import print_function, unicode_literals
+
 
 import codecs
 import os
@@ -45,11 +45,11 @@
 
     sanitized_config = {}
     sanitized_config['substs'] = {
-        k: sanitized_bools(v) for k, v in config.iteritems()
+        k: sanitized_bools(v) for k, v in config.items()
         if k not in ('DEFINES', 'non_global_defines', 'TOPSRCDIR', 'TOPOBJDIR')
     }
     sanitized_config['defines'] = {
-        k: sanitized_bools(v) for k, v in config['DEFINES'].iteritems()
+        k: sanitized_bools(v) for k, v in config['DEFINES'].items()
     }
     sanitized_config['non_global_defines'] = config['non_global_defines']
     sanitized_config['topsrcdir'] = config['TOPSRCDIR']
@@ -71,7 +71,7 @@
         ''') % {'python': config['PYTHON'], 'encoding': encoding})
         # A lot of the build backend code is currently expecting byte
         # strings and breaks in subtle ways with unicode strings. (bug 1296508)
-        for k, v in sanitized_config.iteritems():
+        for k, v in sanitized_config.items():
             fh.write('%s = encode(%s, encoding)\n' % (k, indented_repr(v)))
         fh.write("__all__ = ['topobjdir', 'topsrcdir', 'defines', "
                  "'non_global_defines', 'substs', 'mozconfig']")
@@ -88,7 +88,7 @@
     # executable permissions.
     os.chmod('config.status', 0o755)
     if config.get('MOZ_BUILD_APP') != 'js' or config.get('JS_STANDALONE'):
-        os.environ[b'WRITE_MOZINFO'] = b'1'
+        os.environ['WRITE_MOZINFO'] = '1'
         from mozbuild.config_status import config_status
 
         # Some values in sanitized_config also have more complex types, such as
--- firefox-52.9.0esr/python/blessings/blessings/__init__.py.old	2017-04-11 02:13:23.000000000 +0000
+++ firefox-52.9.0esr/python/blessings/blessings/__init__.py	2018-07-10 10:56:52.820000000 +0000
@@ -333,7 +333,7 @@
                       'shadow', 'standout', 'subscript', 'superscript']))
 
 
-class ParametrizingString(unicode):
+class ParametrizingString(str):
     """A Unicode string which can be called to parametrize it as a terminal capability"""
     def __new__(cls, formatting, normal=None):
         """Instantiate.
@@ -343,7 +343,7 @@
             "normal" capability.
 
         """
-        new = unicode.__new__(cls, formatting)
+        new = str.__new__(cls, formatting)
         new._normal = normal
         return new
 
@@ -375,10 +375,10 @@
                 raise
 
 
-class FormattingString(unicode):
+class FormattingString(str):
     """A Unicode string which can be called upon a piece of text to wrap it in formatting"""
     def __new__(cls, formatting, normal):
-        new = unicode.__new__(cls, formatting)
+        new = str.__new__(cls, formatting)
         new._normal = normal
         return new
 
@@ -393,7 +393,7 @@
         return self + text + self._normal
 
 
-class NullCallableString(unicode):
+class NullCallableString(str):
     """A dummy class to stand in for ``FormattingString`` and ``ParametrizingString``
 
     A callable bytestring that returns an empty Unicode when called with an int
@@ -402,7 +402,7 @@
 
     """
     def __new__(cls):
-        new = unicode.__new__(cls, u'')
+        new = str.__new__(cls, u'')
         return new
 
     def __call__(self, arg):
--- firefox-52.9.0esr/testing/mozbase/mozfile/mozfile/mozfile.py	(original)
+++ firefox-52.9.0esr/testing/mozbase/mozfile/mozfile/mozfile.py	(refactored)
@@ -6,7 +6,7 @@
 
 # We don't import all modules at the top for performance reasons. See Bug 1008943
 
-from __future__ import absolute_import
+
 
 from contextlib import contextmanager
 import errno
@@ -55,7 +55,7 @@
         try:
             bundle = zipfile.ZipFile(src)
         except Exception:
-            print "src: %s" % src
+            print("src: %s" % src)
             raise
 
     namelist = bundle.namelist()
@@ -161,8 +161,8 @@
 
             retry_count += 1
 
-            print '%s() failed for "%s". Reason: %s (%s). Retrying...' % \
-                (func.__name__, args, e.strerror, e.errno)
+            print('%s() failed for "%s". Reason: %s (%s). Retrying...' % \
+                (func.__name__, args, e.strerror, e.errno))
             time.sleep(retry_count * retry_delay)
         else:
             # If no exception has been thrown it should be done
@@ -420,9 +420,9 @@
     Return True if thing looks like a URL.
     """
 
-    import urlparse
-
-    parsed = urlparse.urlparse(thing)
+    import urllib.parse
+
+    parsed = urllib.parse.urlparse(thing)
     if 'scheme' in parsed:
         return len(parsed.scheme) >= 2
     else:
@@ -436,7 +436,7 @@
     result of urllib2.urlopen()
     """
 
-    import urllib2
+    import urllib.request, urllib.error, urllib.parse
 
     # handle file URLs separately due to python stdlib limitations
     if resource.startswith('file://'):
@@ -446,4 +446,4 @@
         # if no scheme is given, it is a file path
-        return file(resource)
+        return open(resource)
 
-    return urllib2.urlopen(resource)
+    return urllib.request.urlopen(resource)
--- firefox-52.9.0esr/testing/mozbase/mozinfo/mozinfo/mozinfo.py	(original)
+++ firefox-52.9.0esr/testing/mozbase/mozinfo/mozinfo/mozinfo.py	(refactored)
@@ -8,7 +8,7 @@
 # linux) to the information; I certainly wouldn't want anyone parsing this
 # information and having behaviour depend on it
 
-from __future__ import absolute_import
+
 
 import os
 import platform
@@ -24,7 +24,7 @@
 class unknown(object):
     """marker class for unknown information"""
 
-    def __nonzero__(self):
+    def __bool__(self):
         return False
 
     def __str__(self):
@@ -184,7 +184,7 @@
                      to a json file containing the new info.
     """
 
-    if isinstance(new_info, basestring):
+    if isinstance(new_info, str):
         # lazy import
         import mozfile
         import json
@@ -246,7 +246,7 @@
 update({})
 
 # exports
-__all__ = info.keys()
+__all__ = list(info.keys())
 __all__ += ['is' + os_name.title() for os_name in choices['os']]
 __all__ += [
     'info',
@@ -284,17 +284,17 @@
 
     # print out choices if requested
     flag = False
-    for key, value in options.__dict__.items():
+    for key, value in list(options.__dict__.items()):
         if value is True:
-            print '%s choices: %s' % (key, ' '.join([str(choice)
-                                                     for choice in choices[key]]))
+            print('%s choices: %s' % (key, ' '.join([str(choice)
+                                                     for choice in choices[key]])))
             flag = True
     if flag:
         return
 
     # otherwise, print out all info
-    for key, value in info.items():
-        print '%s: %s' % (key, value)
+    for key, value in list(info.items()):
+        print('%s: %s' % (key, value))
 
 if __name__ == '__main__':
     main()
--- firefox-52.9.0esr/testing/mozbase/mozinfo/mozinfo/string_version.py.old	2017-04-11 02:13:06.000000000 +0000
+++ firefox-52.9.0esr/testing/mozbase/mozinfo/mozinfo/string_version.py	2018-07-10 11:10:56.140000000 +0000
@@ -10,8 +10,10 @@
     A string version that can be compared with comparison operators.
     """
 
+    def __new__(cls, value):
+        return str.__new__(cls, value)
+
     def __init__(self, vstring):
-        str.__init__(self, vstring)
         self.version = LooseVersion(vstring)
 
     def __repr__(self):
--- firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/manifestparser.py	(original)
+++ firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/manifestparser.py	(refactored)
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this file,
 # You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from StringIO import StringIO
+from io import StringIO
 import json
 import fnmatch
 import os
@@ -21,7 +21,7 @@
 __all__ = ['ManifestParser', 'TestManifest', 'convert']
 
 relpath = os.path.relpath
-string = (basestring,)
+string = (str,)
 
 
 # path normalization
@@ -178,7 +178,7 @@
 
             # otherwise an item
             # apply ancestor defaults, while maintaining current file priority
-            data = dict(self._ancestor_defaults.items() + data.items())
+            data = dict(list(self._ancestor_defaults.items()) + list(data.items()))
 
             test = data
             test['name'] = section
@@ -306,19 +306,19 @@
         # make some check functions
         if inverse:
             def has_tags(test):
-                return not tags.intersection(test.keys())
+                return not tags.intersection(list(test.keys()))
 
             def dict_query(test):
-                for key, value in kwargs.items():
+                for key, value in list(kwargs.items()):
                     if test.get(key) == value:
                         return False
                 return True
         else:
             def has_tags(test):
-                return tags.issubset(test.keys())
+                return tags.issubset(list(test.keys()))
 
             def dict_query(test):
-                for key, value in kwargs.items():
+                for key, value in list(kwargs.items()):
                     if test.get(key) != value:
                         return False
                 return True
@@ -340,7 +340,7 @@
         """
         if tests is None:
             # Make sure to return all the manifests, even ones without tests.
-            return self.manifest_defaults.keys()
+            return list(self.manifest_defaults.keys())
 
         manifests = []
         for test in tests:
@@ -373,8 +373,8 @@
                 raise IOError("Strict mode enabled, test paths must exist. "
                               "The following test(s) are missing: %s" %
                               json.dumps(missing_paths, indent=2))
-            print >> sys.stderr, "Warning: The following test(s) are missing: %s" % \
-                json.dumps(missing_paths, indent=2)
+            print("Warning: The following test(s) are missing: %s" % \
+                json.dumps(missing_paths, indent=2), file=sys.stderr)
         return missing
 
     def verifyDirectory(self, directories, pattern=None, extensions=None):
@@ -385,7 +385,7 @@
         """
 
         files = set([])
-        if isinstance(directories, basestring):
+        if isinstance(directories, str):
             directories = [directories]
 
         # get files in directories
@@ -449,12 +449,12 @@
 
         # print the .ini manifest
         if global_tags or global_kwargs:
-            print >> fp, '[DEFAULT]'
+            print('[DEFAULT]', file=fp)
             for tag in global_tags:
-                print >> fp, '%s =' % tag
-            for key, value in global_kwargs.items():
-                print >> fp, '%s = %s' % (key, value)
-            print >> fp
+                print('%s =' % tag, file=fp)
+            for key, value in list(global_kwargs.items()):
+                print('%s = %s' % (key, value), file=fp)
+            print(file=fp)
 
         for test in tests:
             test = test.copy()  # don't overwrite
@@ -465,7 +465,7 @@
                 if self.rootdir:
                     path = relpath(test['path'], self.rootdir)
                 path = denormalize_path(path)
-            print >> fp, '[%s]' % path
+            print('[%s]' % path, file=fp)
 
             # reserved keywords:
             reserved = ['path', 'name', 'here', 'manifest', 'relpath', 'ancestor-manifest']
@@ -476,8 +476,8 @@
                     continue
                 if key in global_tags and not test[key]:
                     continue
-                print >> fp, '%s = %s' % (key, test[key])
-            print >> fp
+                print('%s = %s' % (key, test[key]), file=fp)
+            print(file=fp)
 
         if close:
             # close the created file
@@ -565,7 +565,7 @@
                     message = "Missing test: '%s' does not exist!"
                     if self.strict:
                         raise IOError(message)
-                    print >> sys.stderr, message + " Skipping."
+                    print(message + " Skipping.", file=sys.stderr)
                     continue
                 destination = os.path.join(rootdir, _relpath)
                 shutil.copy(source, destination)
@@ -578,7 +578,7 @@
         internal function to import directories
         """
 
-        if isinstance(pattern, basestring):
+        if isinstance(pattern, str):
             patterns = [pattern]
         else:
             patterns = pattern
@@ -670,9 +670,9 @@
             if (dirnames or filenames) and not (os.path.exists(manifest_path) and overwrite):
                 with file(manifest_path, 'w') as manifest:
                     for dirname in dirnames:
-                        print >> manifest, '[include:%s]' % os.path.join(dirname, filename)
+                        print('[include:%s]' % os.path.join(dirname, filename), file=manifest)
                     for _filename in filenames:
-                        print >> manifest, '[%s]' % _filename
+                        print('[%s]' % _filename, file=manifest)
 
                 # add to list of manifests
                 manifest_dict.setdefault(directory, manifest_path)
@@ -722,8 +722,8 @@
                              for filename in filenames]
 
             # write to manifest
-            print >> write, '\n'.join(['[%s]' % denormalize_path(filename)
-                                       for filename in filenames])
+            print('\n'.join(['[%s]' % denormalize_path(filename)
+                                       for filename in filenames]), file=write)
 
         cls._walk_directories(directories, callback, pattern=pattern, ignore=ignore)
 
--- firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/cli.py	(original)
+++ firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/cli.py	(refactored)
@@ -81,7 +81,7 @@
         # parse the arguments
         try:
             kwargs, tags, args = parse_args(args)
-        except ParserError, e:
+        except ParserError as e:
             self._parser.error(e.message)
 
         # make sure we have some manifests, otherwise it will
@@ -132,7 +132,7 @@
             manifest = convert(args, pattern=options.pattern, ignore=options.ignore,
                                write=options.in_place)
         if manifest:
-            print manifest
+            print(manifest)
 
 
 class WriteCLI(CLICommand):
@@ -146,7 +146,7 @@
         # parse the arguments
         try:
             kwargs, tags, args = parse_args(args)
-        except ParserError, e:
+        except ParserError as e:
             self._parser.error(e.message)
 
         # make sure we have some manifests, otherwise it will
@@ -175,9 +175,9 @@
             commands[args[0]](self._parser).parser().print_help()
         else:
             self._parser.print_help()
-            print '\nCommands:'
+            print('\nCommands:')
             for command in sorted(commands):
-                print '  %s : %s' % (command, commands[command].__doc__.strip())
+                print('  %s : %s' % (command, commands[command].__doc__.strip()))
 
 
 class UpdateCLI(CLICommand):
@@ -190,7 +190,7 @@
         # parse the arguments
         try:
             kwargs, tags, args = parse_args(args)
-        except ParserError, e:
+        except ParserError as e:
             self._parser.error(e.message)
 
         # make sure we have some manifests, otherwise it will
--- firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/expression.py	(original)
+++ firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/expression.py	(refactored)
@@ -275,7 +275,7 @@
         """
         if not isinstance(self.token, expected):
             raise Exception("Unexpected token!")
-        self.token = self.iter.next()
+        self.token = next(self.iter)
 
     def expression(self, rbp=0):
         """
@@ -283,11 +283,11 @@
         right binding power greater than rbp is encountered.
         """
         t = self.token
-        self.token = self.iter.next()
+        self.token = next(self.iter)
         left = t.nud(self)
         while rbp < self.token.lbp:
             t = self.token
-            self.token = self.iter.next()
+            self.token = next(self.iter)
             left = t.led(self, left)
         return left
 
@@ -299,7 +299,7 @@
         """
         try:
             self.iter = self._tokenize()
-            self.token = self.iter.next()
+            self.token = next(self.iter)
             return self.expression()
         except:
             extype, ex, tb = sys.exc_info()
@@ -307,7 +307,7 @@
             raise ParseError("could not parse: "
                              "%s\nexception: %svariables: %s" % (self.text,
                                                                  formatted,
-                                                                 self.valuemapping)), None, tb
+                                                                 self.valuemapping)).with_traceback(tb)
 
     __call__ = parse
 
--- firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/filters.py	(original)
+++ firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/filters.py	(refactored)
@@ -92,7 +92,7 @@
     def __init__(self, *args, **kwargs):
         self.fmt_args = ', '.join(itertools.chain(
             [str(a) for a in args],
-            ['{}={}'.format(k, v) for k, v in kwargs.iteritems()]))
+            ['{}={}'.format(k, v) for k, v in kwargs.items()]))
 
     def __eq__(self, other):
         if self.unique:
@@ -249,7 +249,7 @@
         # be yielded for reporting purposes. Put them all in chunk 1 for
         # simplicity.
         if self.this_chunk == 1:
-            disabled_dirs = [v for k, v in tests_by_dir.iteritems()
+            disabled_dirs = [v for k, v in tests_by_dir.items()
                              if k not in ordered_dirs]
             for disabled_test in itertools.chain(*disabled_dirs):
                 yield disabled_test
@@ -326,7 +326,7 @@
 
     def __init__(self, tags):
         InstanceFilter.__init__(self, tags)
-        if isinstance(tags, basestring):
+        if isinstance(tags, str):
             tags = [tags]
         self.tags = tags
 
@@ -349,7 +349,7 @@
 
     def __init__(self, paths):
         InstanceFilter.__init__(self, paths)
-        if isinstance(paths, basestring):
+        if isinstance(paths, str):
             paths = [paths]
         self.paths = paths
 
--- firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/ini.py	(original)
+++ firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/ini.py	(refactored)
@@ -27,7 +27,7 @@
     sections = []
     key = value = None
     section_names = set()
-    if isinstance(fp, basestring):
-        fp = file(fp)
+    if isinstance(fp, str):
+        fp = open(fp)
 
     # read the lines
@@ -131,7 +131,7 @@
         'support-files': '%s %s',
     }
     final_mapping = global_vars.copy()
-    for field_name, value in local_vars.items():
+    for field_name, value in list(local_vars.items()):
         if field_name not in field_patterns or field_name not in global_vars:
             final_mapping[field_name] = value
             continue
--- firefox-52.9.0esr/python/mozbuild/mozbuild/util.py.old	2018-07-10 11:16:10.690000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/util.py	2018-07-10 23:36:02.250000000 +0000
@@ -1254,10 +1254,10 @@
             encode(k, encoding): encode(v, encoding)
             for k, v in obj.items()
         }
-    if isinstance(obj, bytes):
-        return obj
     if isinstance(obj, str):
-        return obj.encode(encoding)
+        return obj
+    if isinstance(obj, bytes):
+        return obj.decode(encoding)
     if isinstance(obj, Iterable):
         return [encode(i, encoding) for i in obj]
     return obj
--- firefox-52.9.0esr/python/mozbuild/mozbuild/util.py.old	2018-07-10 23:36:33.980000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/util.py	2018-07-10 23:41:51.900000000 +0000
@@ -1179,6 +1179,9 @@
             POSSIBLE_VALUES = possible_values
         return EnumStringSubclass
 
+    def __hash__(self):
+        return hash(str(self))
+
 
 def _escape_char(c):
     # str.encode('unicode_espace') doesn't escape quotes, presumably because
--- firefox-52.9.0esr/python/mozbuild/mozbuild/mozinfo.py.old	2018-07-10 23:42:19.390000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/mozinfo.py	2018-07-11 01:45:57.930000000 +0000
@@ -155,6 +155,6 @@
     """
     build_conf = build_dict(config, env)
     if isinstance(file, str):
-        file = open(file, 'wb')
+        file = open(file, 'w')
 
     json.dump(build_conf, file, sort_keys=True, indent=4)
--- firefox-52.9.0esr/python/mozbuild/mozbuild/jar.py.old	2018-07-11 01:46:26.540000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/jar.py	2018-07-11 02:02:36.010000000 +0000
@@ -16,7 +16,7 @@
 import re
 import logging
 from time import localtime
-from MozZipFile import ZipFile
+from zipfile import ZipFile
 from io import StringIO
 from collections import defaultdict
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/util.py.old	2018-07-11 02:05:38.530000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/util.py	2018-07-11 02:08:21.020000000 +0000
@@ -987,8 +987,6 @@
                                     'got %s, expected %s' % (fname,
                                     type(value), ftype))
 
-            super(TypedTuple, self).__init__(*args, **kwargs)
-
     TypedTuple._fields = fields
 
     return TypedTuple
--- firefox-52.9.0esr/build/moz.configure/init.configure.old	2018-07-11 02:08:50.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/init.configure	2018-07-11 04:04:26.600000000 +0000
@@ -297,7 +297,9 @@
     # There is also a quartet form:
     #   CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
     # But we can consider the "KERNEL-OPERATING_SYSTEM" as one.
-    cpu, manufacturer, os = triplet.decode('utf-8').split('-', 2)
+    if isinstance(triplet, bytes):
+        triplet = triplet.decode('utf-8')
+    cpu, manufacturer, os = triplet.split('-', 2)
 
     # Autoconf uses config.sub to validate and canonicalize those triplets,
     # but the granularity of its results has never been satisfying to our
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/reader.py.old	2018-07-11 04:25:33.980000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/reader.py	2018-07-11 04:24:50.630000000 +0000
@@ -441,6 +441,8 @@
         code = func.__code__
         firstlineno = code.co_firstlineno
         lines = sandbox._current_source.splitlines(True)
+        if len(lines) and isinstance(lines[0], bytes):
+            lines = [l.decode('utf-8') for l in lines]
         lines = inspect.getblock(lines[firstlineno - 1:])
 
         # The code lines we get out of inspect.getsourcelines look like
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/reader.py.old	2018-07-11 04:25:57.090000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/reader.py	2018-07-11 04:29:46.140000000 +0000
@@ -460,7 +460,7 @@
         # actually never calls __getitem__ and __setitem__, so we need to
         # modify the AST so that accesses to globals are properly directed
         # to a dict.
-        self._global_name = b'_data' # AST wants str for this, not unicode
+        self._global_name = '_data' # AST wants str for this, not unicode
         # In case '_data' is a name used for a variable in the function code,
         # prepend more underscores until we find an unused name.
         while (self._global_name in code.co_names or
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/context.py.old	2018-07-11 04:30:06.590000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/context.py	2018-07-11 04:35:38.670000000 +0000
@@ -384,8 +384,8 @@
 
     def __cmp__(self, other):
         if isinstance(other, Path) and self.srcdir != other.srcdir:
-            return cmp(self.full_path, other.full_path)
-        return cmp(str(self), other)
+            return self.full_path == other.full_path
+        return str(self) == other
 
     # __cmp__ is not enough because unicode has __eq__, __ne__, etc. defined
     # and __cmp__ is only used for those when they don't exist.
--- firefox-52.9.0esr/mozglue/build/moz.build.old	2018-07-11 04:40:17.930000000 +0000
+++ firefox-52.9.0esr/mozglue/build/moz.build	2018-07-11 04:42:00.830000000 +0000
@@ -4,20 +4,15 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-# Build mozglue as a shared lib on Windows, OSX and Android.
+# Build mozglue as a shared lib on Windows and OSX.
 # If this is ever changed, update MOZ_SHARED_MOZGLUE in browser/installer/Makefile.in
-if CONFIG['OS_TARGET'] in ('WINNT', 'Darwin', 'Android'):
+if CONFIG['OS_TARGET'] in ('WINNT', 'Darwin'):
     SharedLibrary('mozglue')
 else:
     Library('mozglue')
 
 SDK_LIBRARY = True
 
-if CONFIG['OS_TARGET'] == 'Android':
-    SOURCES += [
-        'BionicGlue.cpp',
-    ]
-
 if CONFIG['MOZ_ASAN']:
     SOURCES += [
         'AsanOptions.cpp',
--- firefox-52.9.0esr/js/src/moz.build.old	2017-04-11 02:13:16.000000000 +0000
+++ firefox-52.9.0esr/js/src/moz.build	2018-07-11 04:43:59.920000000 +0000
@@ -707,7 +707,7 @@
     CXXFLAGS += ['-wd4577']
     CXXFLAGS += ['-wd4312']
 
-if CONFIG['OS_ARCH'] not in ('WINNT', 'HP-UX'):
+if CONFIG['OS_ARCH'] != 'WINNT':
     OS_LIBS += [
         'm',
     ]
@@ -722,13 +722,13 @@
         'dl',
     ]
 
-if CONFIG['OS_ARCH'] == 'SunOS':
-    OS_LIBS += [
-        'posix4',
-        'dl',
-        'nsl',
-        'socket',
-    ]
+#if CONFIG['OS_ARCH'] == 'SunOS':
+#    OS_LIBS += [
+#        'posix4',
+#        'dl',
+#        'nsl',
+#        'socket',
+#    ]
 
 OS_LIBS += CONFIG['REALTIME_LIBS']
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/util.py.old	2018-07-11 04:44:24.900000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/util.py	2018-07-11 04:46:47.310000000 +0000
@@ -267,6 +267,10 @@
             if 'b' in self.mode:
                 writemode += 'b'
             with open(self.name, writemode) as file:
+                if 'b' in self.mode and isinstance(buf, str):
+                    buf = buf.encode('utf-8')
+                elif 'b' not in self.mode and isinstance(buf, bytes):
+                    buf = buf.decode('utf-8')
                 file.write(buf)
 
         if self._capture_diff:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/backend/recursivemake.py.old	2018-07-11 04:47:15.020000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/backend/recursivemake.py	2018-07-11 04:53:51.750000000 +0000
@@ -77,86 +77,86 @@
 from functools import reduce
 
 MOZBUILD_VARIABLES = [
-    b'ANDROID_APK_NAME',
-    b'ANDROID_APK_PACKAGE',
-    b'ANDROID_ASSETS_DIRS',
-    b'ANDROID_EXTRA_PACKAGES',
-    b'ANDROID_EXTRA_RES_DIRS',
-    b'ANDROID_GENERATED_RESFILES',
-    b'ANDROID_RES_DIRS',
-    b'ASFLAGS',
-    b'CMSRCS',
-    b'CMMSRCS',
-    b'CPP_UNIT_TESTS',
-    b'DIRS',
-    b'DIST_INSTALL',
-    b'EXTRA_DSO_LDOPTS',
-    b'EXTRA_JS_MODULES',
-    b'EXTRA_PP_COMPONENTS',
-    b'EXTRA_PP_JS_MODULES',
-    b'FORCE_SHARED_LIB',
-    b'FORCE_STATIC_LIB',
-    b'FINAL_LIBRARY',
-    b'HOST_CFLAGS',
-    b'HOST_CSRCS',
-    b'HOST_CMMSRCS',
-    b'HOST_CXXFLAGS',
-    b'HOST_EXTRA_LIBS',
-    b'HOST_LIBRARY_NAME',
-    b'HOST_PROGRAM',
-    b'HOST_SIMPLE_PROGRAMS',
-    b'IS_COMPONENT',
-    b'JAR_MANIFEST',
-    b'JAVA_JAR_TARGETS',
-    b'LD_VERSION_SCRIPT',
-    b'LIBRARY_NAME',
-    b'LIBS',
-    b'MAKE_FRAMEWORK',
-    b'MODULE',
-    b'NO_DIST_INSTALL',
-    b'NO_EXPAND_LIBS',
-    b'NO_INTERFACES_MANIFEST',
-    b'NO_JS_MANIFEST',
-    b'OS_LIBS',
-    b'PARALLEL_DIRS',
-    b'PREF_JS_EXPORTS',
-    b'PROGRAM',
-    b'PYTHON_UNIT_TESTS',
-    b'RESOURCE_FILES',
-    b'SDK_HEADERS',
-    b'SDK_LIBRARY',
-    b'SHARED_LIBRARY_LIBS',
-    b'SHARED_LIBRARY_NAME',
-    b'SIMPLE_PROGRAMS',
-    b'SONAME',
-    b'STATIC_LIBRARY_NAME',
-    b'TEST_DIRS',
-    b'TOOL_DIRS',
+    'ANDROID_APK_NAME',
+    'ANDROID_APK_PACKAGE',
+    'ANDROID_ASSETS_DIRS',
+    'ANDROID_EXTRA_PACKAGES',
+    'ANDROID_EXTRA_RES_DIRS',
+    'ANDROID_GENERATED_RESFILES',
+    'ANDROID_RES_DIRS',
+    'ASFLAGS',
+    'CMSRCS',
+    'CMMSRCS',
+    'CPP_UNIT_TESTS',
+    'DIRS',
+    'DIST_INSTALL',
+    'EXTRA_DSO_LDOPTS',
+    'EXTRA_JS_MODULES',
+    'EXTRA_PP_COMPONENTS',
+    'EXTRA_PP_JS_MODULES',
+    'FORCE_SHARED_LIB',
+    'FORCE_STATIC_LIB',
+    'FINAL_LIBRARY',
+    'HOST_CFLAGS',
+    'HOST_CSRCS',
+    'HOST_CMMSRCS',
+    'HOST_CXXFLAGS',
+    'HOST_EXTRA_LIBS',
+    'HOST_LIBRARY_NAME',
+    'HOST_PROGRAM',
+    'HOST_SIMPLE_PROGRAMS',
+    'IS_COMPONENT',
+    'JAR_MANIFEST',
+    'JAVA_JAR_TARGETS',
+    'LD_VERSION_SCRIPT',
+    'LIBRARY_NAME',
+    'LIBS',
+    'MAKE_FRAMEWORK',
+    'MODULE',
+    'NO_DIST_INSTALL',
+    'NO_EXPAND_LIBS',
+    'NO_INTERFACES_MANIFEST',
+    'NO_JS_MANIFEST',
+    'OS_LIBS',
+    'PARALLEL_DIRS',
+    'PREF_JS_EXPORTS',
+    'PROGRAM',
+    'PYTHON_UNIT_TESTS',
+    'RESOURCE_FILES',
+    'SDK_HEADERS',
+    'SDK_LIBRARY',
+    'SHARED_LIBRARY_LIBS',
+    'SHARED_LIBRARY_NAME',
+    'SIMPLE_PROGRAMS',
+    'SONAME',
+    'STATIC_LIBRARY_NAME',
+    'TEST_DIRS',
+    'TOOL_DIRS',
     # XXX config/Makefile.in specifies this in a make invocation
     #'USE_EXTENSION_MANIFEST',
-    b'XPCSHELL_TESTS',
-    b'XPIDL_MODULE',
+    'XPCSHELL_TESTS',
+    'XPIDL_MODULE',
 ]
 
 DEPRECATED_VARIABLES = [
-    b'ANDROID_RESFILES',
-    b'EXPORT_LIBRARY',
-    b'EXTRA_LIBS',
-    b'HOST_LIBS',
-    b'LIBXUL_LIBRARY',
-    b'MOCHITEST_A11Y_FILES',
-    b'MOCHITEST_BROWSER_FILES',
-    b'MOCHITEST_BROWSER_FILES_PARTS',
-    b'MOCHITEST_CHROME_FILES',
-    b'MOCHITEST_FILES',
-    b'MOCHITEST_FILES_PARTS',
-    b'MOCHITEST_METRO_FILES',
-    b'MOCHITEST_ROBOCOP_FILES',
-    b'MODULE_OPTIMIZE_FLAGS',
-    b'MOZ_CHROME_FILE_FORMAT',
-    b'SHORT_LIBNAME',
-    b'TESTING_JS_MODULES',
-    b'TESTING_JS_MODULE_DIR',
+    'ANDROID_RESFILES',
+    'EXPORT_LIBRARY',
+    'EXTRA_LIBS',
+    'HOST_LIBS',
+    'LIBXUL_LIBRARY',
+    'MOCHITEST_A11Y_FILES',
+    'MOCHITEST_BROWSER_FILES',
+    'MOCHITEST_BROWSER_FILES_PARTS',
+    'MOCHITEST_CHROME_FILES',
+    'MOCHITEST_FILES',
+    'MOCHITEST_FILES_PARTS',
+    'MOCHITEST_METRO_FILES',
+    'MOCHITEST_ROBOCOP_FILES',
+    'MODULE_OPTIMIZE_FLAGS',
+    'MOZ_CHROME_FILE_FORMAT',
+    'SHORT_LIBNAME',
+    'TESTING_JS_MODULES',
+    'TESTING_JS_MODULE_DIR',
 ]
 
 MOZBUILD_VARIABLES_MESSAGE = 'It should only be defined in moz.build files.'
@@ -758,7 +758,7 @@
             rule.add_dependencies(['$(CURDIR)/%: %'])
 
     def _check_blacklisted_variables(self, makefile_in, makefile_content):
-        if b'EXTERNALLY_MANAGED_MAKE_FILE' in makefile_content:
+        if 'EXTERNALLY_MANAGED_MAKE_FILE' in makefile_content:
             # Bypass the variable restrictions for externally managed makefiles.
             return
 
@@ -765,7 +765,7 @@
         for l in makefile_content.splitlines():
             l = l.strip()
             # Don't check comments
-            if l.startswith(b'#'):
+            if l.startswith('#'):
                 continue
             for x in chain(MOZBUILD_VARIABLES, DEPRECATED_VARIABLES):
                 if x not in l:
@@ -822,11 +822,11 @@
                     # Skip every directory but those with a Makefile
                     # containing a tools target, or XPI_PKGNAME or
                     # INSTALL_EXTENSION_ID.
-                    for t in (b'XPI_PKGNAME', b'INSTALL_EXTENSION_ID',
-                            b'tools'):
+                    for t in ('XPI_PKGNAME', 'INSTALL_EXTENSION_ID',
+                            'tools'):
                         if t not in content:
                             continue
-                        if t == b'tools' and not re.search('(?:^|\s)tools.*::', content, re.M):
+                        if t == 'tools' and not re.search('(?:^|\s)tools.*::', content, re.M):
                             continue
                         if objdir == self.environment.topobjdir:
                             continue
@@ -1422,20 +1422,20 @@
                 pp.context.update(extra)
             if not pp.context.get('autoconfmk', ''):
                 pp.context['autoconfmk'] = 'autoconf.mk'
-            pp.handleLine(b'# THIS FILE WAS AUTOMATICALLY GENERATED. DO NOT MODIFY BY HAND.\n');
-            pp.handleLine(b'DEPTH := @DEPTH@\n')
-            pp.handleLine(b'topobjdir := @topobjdir@\n')
-            pp.handleLine(b'topsrcdir := @top_srcdir@\n')
-            pp.handleLine(b'srcdir := @srcdir@\n')
-            pp.handleLine(b'VPATH := @srcdir@\n')
-            pp.handleLine(b'relativesrcdir := @relativesrcdir@\n')
-            pp.handleLine(b'include $(DEPTH)/config/@autoconfmk@\n')
+            pp.handleLine('# THIS FILE WAS AUTOMATICALLY GENERATED. DO NOT MODIFY BY HAND.\n');
+            pp.handleLine('DEPTH := @DEPTH@\n')
+            pp.handleLine('topobjdir := @topobjdir@\n')
+            pp.handleLine('topsrcdir := @top_srcdir@\n')
+            pp.handleLine('srcdir := @srcdir@\n')
+            pp.handleLine('VPATH := @srcdir@\n')
+            pp.handleLine('relativesrcdir := @relativesrcdir@\n')
+            pp.handleLine('include $(DEPTH)/config/@autoconfmk@\n')
             if not stub:
                 pp.do_include(obj.input_path)
             # Empty line to avoid failures when last line in Makefile.in ends
             # with a backslash.
-            pp.handleLine(b'\n')
-            pp.handleLine(b'include $(topsrcdir)/config/recurse.mk\n')
+            pp.handleLine('\n')
+            pp.handleLine('include $(topsrcdir)/config/recurse.mk\n')
         if not stub:
             # Adding the Makefile.in here has the desired side-effect
             # that if the Makefile.in disappears, this will force
--- firefox-52.9.0esr/python/mozbuild/mozpack/manifests.py.old	2018-07-11 04:54:39.260000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozpack/manifests.py	2018-07-11 04:57:31.710000000 +0000
@@ -115,7 +115,7 @@
         self._source_files = set()
 
         if path or fileobj:
-            with _auto_fileobj(path, fileobj, 'rb') as fh:
+            with _auto_fileobj(path, fileobj, 'r') as fh:
                 self._source_files.add(fh.name)
                 self._load_from_fileobj(fh)
 
@@ -174,7 +174,7 @@
                 dest, content = fields[1:]
 
                 self.add_content(
-                    self._decode_field_entry(content).encode('utf-8'), dest)
+                    self._decode_field_entry(content), dest)
                 continue
 
             # Don't fail for non-actionable items, allowing
@@ -236,7 +236,7 @@
 
         It is an error if both are specified.
         """
-        with _auto_fileobj(path, fileobj, 'wb') as fh:
+        with _auto_fileobj(path, fileobj, 'w') as fh:
             fh.write('%d\n' % self.CURRENT_VERSION)
 
             for dest in sorted(self._dests):
@@ -244,8 +244,7 @@
 
                 parts = ['%d' % entry[0], dest]
                 parts.extend(entry[1:])
-                fh.write('%s\n' % self.FIELD_SEPARATOR.join(
-                    p.encode('utf-8') for p in parts))
+                fh.write('%s\n' % self.FIELD_SEPARATOR.join(parts))
 
     def add_symlink(self, source, dest):
         """Add a symlink to this manifest.
@@ -391,7 +390,7 @@
             if install_type == self.CONTENT:
                 # GeneratedFile expect the buffer interface, which the unicode
                 # type doesn't have, so encode to a str.
-                content = self._decode_field_entry(entry[1]).encode('utf-8')
+                content = self._decode_field_entry(entry[1])
                 registry.add(dest, GeneratedFile(content))
                 continue
 
--- firefox-52.9.0esr/config/MozZipFile.py	(original)
+++ firefox-52.9.0esr/config/MozZipFile.py	(refactored)
@@ -18,7 +18,7 @@
   def __init__(self, file, mode="r", compression=zipfile.ZIP_STORED,
                lock = False):
     if lock:
-      assert isinstance(file, basestring)
+      assert isinstance(file, str)
       self.lockfile = lock_file(file + '.lck')
     else:
       self.lockfile = None
@@ -46,7 +46,7 @@
                               date_time=time.localtime(time.time()))
       zinfo.compress_type = self.compression
       # Add some standard UNIX file access permissions (-rw-r--r--).
-      zinfo.external_attr = (0x81a4 & 0xFFFF) << 16L
+      zinfo.external_attr = (0x81a4 & 0xFFFF) << 16
     else:
       zinfo = zinfo_or_arcname
 
@@ -58,7 +58,7 @@
     # as the old, reuse the existing entry.
 
     doSeek = False # store if we need to seek to the eof after overwriting
-    if self.NameToInfo.has_key(zinfo.filename):
+    if zinfo.filename in self.NameToInfo:
       # Find the last ZipInfo with our name.
       # Last, because that's catching multiple overwrites
       i = len(self.filelist)
@@ -109,14 +109,14 @@
       # adjust file mode if we originally just wrote, now we rewrite
       self.fp.close()
       self.fp = open(self.filename, 'r+b')
-    all = map(lambda zi: (zi, True), self.filelist) + \
-        map(lambda zi: (zi, False), self._remove)
+    all = [(zi, True) for zi in self.filelist] + \
+        [(zi, False) for zi in self._remove]
     all.sort(lambda l, r: cmp(l[0].header_offset, r[0].header_offset))
     # empty _remove for multiple closes
     self._remove = []
 
     lengths = [all[i+1][0].header_offset - all[i][0].header_offset
-               for i in xrange(len(all)-1)]
+               for i in range(len(all)-1)]
     lengths.append(self.end - all[-1][0].header_offset)
     to_pos = 0
     for (zi, keep), length in zip(all, lengths):
--- firefox-52.9.0esr/config/check_spidermonkey_style.py	(original)
+++ firefox-52.9.0esr/config/check_spidermonkey_style.py	(refactored)
@@ -35,7 +35,7 @@
 #   isolation, but don't try to do any order checking between such blocks.
 #----------------------------------------------------------------------------
 
-from __future__ import print_function
+
 
 import difflib
 import os
@@ -270,7 +270,7 @@
         edges[inclname] = set()
 
     # Process all the JS files.
-    for filename in js_names.keys():
+    for filename in list(js_names.keys()):
         inclname = js_names[filename]
         file_kind = FileKind.get(filename)
         if file_kind == FileKind.C or file_kind == FileKind.CPP or \
--- firefox-52.9.0esr/config/expandlibs.py	(original)
+++ firefox-52.9.0esr/config/expandlibs.py	(refactored)
@@ -26,7 +26,7 @@
   descriptor contains. And for each of these LIBS, also apply the same
   rules.
 '''
-from __future__ import with_statement
+
 import sys, os, errno
 import expandlibs_config as conf
 
@@ -36,7 +36,7 @@
     if dir and not os.path.exists(dir):
         try:
             os.makedirs(dir)
-        except OSError, error:
+        except OSError as error:
             if error.errno != errno.EEXIST:
                 raise
 
@@ -140,4 +140,4 @@
         return [relativize(arg)]
 
 if __name__ == '__main__':
-    print " ".join(ExpandArgs(sys.argv[1:]))
+    print(" ".join(ExpandArgs(sys.argv[1:])))
--- firefox-52.9.0esr/config/expandlibs_exec.py	(original)
+++ firefox-52.9.0esr/config/expandlibs_exec.py	(refactored)
@@ -20,7 +20,7 @@
 relevant linker options to change the order in which the linker puts the
 symbols appear in the resulting binary. Only works for ELF targets.
 '''
-from __future__ import with_statement
+
 import sys
 import os
 from expandlibs import (
@@ -304,11 +304,11 @@
         return syms
 
 def print_command(out, args):
-    print >>out, "Executing: " + " ".join(args)
+    print("Executing: " + " ".join(args), file=out)
     for tmp in [f for f in args.tmp if os.path.isfile(f)]:
-        print >>out, tmp + ":"
+        print(tmp + ":", file=out)
         with open(tmp) as file:
-            print >>out, "".join(["    " + l for l in file.readlines()])
+            print("".join(["    " + l for l in file.readlines()]), file=out)
     out.flush()
 
 def main(args, proc_callback=None):
@@ -338,8 +338,8 @@
             proc = subprocess.Popen(args, stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
             if proc_callback:
                 proc_callback(proc)
-        except Exception, e:
-            print >>sys.stderr, 'error: Launching', args, ':', e
+        except Exception as e:
+            print('error: Launching', args, ':', e, file=sys.stderr)
             raise e
         (stdout, stderr) = proc.communicate()
         if proc.returncode and not options.verbose:
--- firefox-52.9.0esr/config/expandlibs_gen.py	(original)
+++ firefox-52.9.0esr/config/expandlibs_gen.py	(refactored)
@@ -5,7 +5,7 @@
 '''Given a list of object files and library names, prints a library
 descriptor to standard output'''
 
-from __future__ import with_statement
+
 import sys
 import os
 import expandlibs_config as conf
@@ -38,4 +38,4 @@
 
     ensureParentDir(options.output)
     with open(options.output, 'w') as outfile:
-        print >>outfile, generate(args)
+        print(generate(args), file=outfile)
--- firefox-52.9.0esr/config/find_OOM_errors.py	(original)
+++ firefox-52.9.0esr/config/find_OOM_errors.py	(refactored)
@@ -2,7 +2,7 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
-from __future__ import print_function
+
 
 usage = """%prog: A test for OOM conditions in the shell.
 
@@ -95,12 +95,12 @@
   """Keep track of the amount of times individual lines occur, in order to
      prioritize the errors which occur most frequently."""
   counts = {}
-  for string,count in blacklist.items():
+  for string,count in list(blacklist.items()):
     for line in string.split("\n"):
       counts[line] = counts.get(line, 0) + count
 
   lines = []
-  for k,v in counts.items():
+  for k,v in list(counts.items()):
     lines.append("{0:6}: {1}".format(v, k))
 
   lines.sort()
--- firefox-52.9.0esr/config/link.py	(original)
+++ firefox-52.9.0esr/config/link.py	(refactored)
@@ -18,7 +18,7 @@
         time.sleep(0.5)
         idleTime += 0.5
         if idleTime > 20 * 60:
-          print "Still linking, 20 minutes passed..."
+          print("Still linking, 20 minutes passed...")
           sys.stdout.flush()
           idleTime = 0
 
@@ -42,6 +42,6 @@
 
 if __name__ == "__main__":
     if len(sys.argv) < 2:
-        print >>sys.stderr, "Usage: link.py <commandline>"
+        print("Usage: link.py <commandline>", file=sys.stderr)
         sys.exit(1)
     sys.exit(wrap_linker(sys.argv[1:]))
--- firefox-52.9.0esr/config/mozunit.py	(original)
+++ firefox-52.9.0esr/config/mozunit.py	(refactored)
@@ -140,7 +140,7 @@
     '''
     def __init__(self, files = {}):
         self.files = {}
-        for name, content in files.iteritems():
+        for name, content in files.items():
             self.files[normcase(os.path.abspath(name))] = content
 
     def __call__(self, name, mode = 'r'):
@@ -158,19 +158,19 @@
         return file
 
     def __enter__(self):
-        import __builtin__
-        self.open = __builtin__.open
+        import builtins
+        self.open = builtins.open
         self._orig_path_exists = os.path.exists
         self._orig_path_isdir = os.path.isdir
         self._orig_path_isfile = os.path.isfile
-        __builtin__.open = self
+        builtins.open = self
         os.path.exists = self._wrapped_exists
         os.path.isdir = self._wrapped_isdir
         os.path.isfile = self._wrapped_isfile
 
     def __exit__(self, type, value, traceback):
-        import __builtin__
-        __builtin__.open = self.open
+        import builtins
+        builtins.open = self.open
         os.path.exists = self._orig_path_exists
         os.path.isdir = self._orig_path_isdir
         os.path.isfile = self._orig_path_isfile
--- firefox-52.9.0esr/config/nsinstall.py	(original)
+++ firefox-52.9.0esr/config/nsinstall.py	(refactored)
@@ -9,7 +9,7 @@
 # a full build environment set up.
 # The basic limitation is, it doesn't even try to link and ignores
 # all related options.
-from __future__ import print_function
+
 from optparse import OptionParser
 import mozfile
 import os
@@ -149,7 +149,7 @@
 
 # nsinstall as a native command is always UTF-8
 def nsinstall(argv):
-  return _nsinstall_internal([unicode(arg, "utf-8") for arg in argv])
+  return _nsinstall_internal([str(arg, "utf-8") for arg in argv])
 
 if __name__ == '__main__':
   # sys.argv corrupts characters outside the system code page on Windows
@@ -175,8 +175,8 @@
   else:
     # For consistency, do it on Unix as well
     if sys.stdin.encoding is not None:
-      argv = [unicode(arg, sys.stdin.encoding) for arg in sys.argv]
+      argv = [str(arg, sys.stdin.encoding) for arg in sys.argv]
     else:
-      argv = [unicode(arg) for arg in sys.argv]
+      argv = [str(arg) for arg in sys.argv]
 
   sys.exit(_nsinstall_internal(argv[1:]))
--- firefox-52.9.0esr/config/printconfigsetting.py	(original)
+++ firefox-52.9.0esr/config/printconfigsetting.py	(refactored)
@@ -5,12 +5,12 @@
 import configobj
 import sys
 import re
-from StringIO import StringIO
+from io import StringIO
 
 try:
     (file, section, key) = sys.argv[1:]
 except ValueError:
-    print "Usage: printconfigsetting.py <file> <section> <setting>"
+    print("Usage: printconfigsetting.py <file> <section> <setting>")
     sys.exit(1)
 
 with open(file) as fh:
@@ -21,11 +21,11 @@
 try:
     s = c[section]
 except KeyError:
-    print >>sys.stderr, "Section [%s] not found." % section
+    print("Section [%s] not found." % section, file=sys.stderr)
     sys.exit(1)
 
 try:
-    print s[key]
+    print(s[key])
 except KeyError:
-    print >>sys.stderr, "Key %s not found." % key
+    print("Key %s not found." % key, file=sys.stderr)
     sys.exit(1)
--- firefox-52.9.0esr/config/pythonpath.py	(original)
+++ firefox-52.9.0esr/config/pythonpath.py	(refactored)
@@ -9,7 +9,7 @@
 
 def main(args):
     def usage():
-        print >>sys.stderr, "pythonpath.py -I directory script.py [args...]"
+        print("pythonpath.py -I directory script.py [args...]", file=sys.stderr)
         sys.exit(150)
 
     paths = []
@@ -45,7 +45,7 @@
     frozenglobals['__name__'] = '__main__'
     frozenglobals['__file__'] = script
 
-    execfile(script, frozenglobals)
+    exec(compile(open(script).read(), script, 'exec'), frozenglobals)
 
 # Freeze scope here ... why this makes things work I have no idea ...
 frozenglobals = globals()
--- firefox-52.9.0esr/config/rebuild_check.py	(original)
+++ firefox-52.9.0esr/config/rebuild_check.py	(refactored)
@@ -18,7 +18,7 @@
     deps = args[1:]
     t = mtime(target)
     if t < 0:
-        print target
+        print(target)
         return
 
     newer = []
@@ -31,13 +31,13 @@
             newer.append(dep)
 
     if newer and removed:
-        print 'Rebuilding %s because %s changed and %s was removed' % (target, ', '.join(newer), ', '.join(removed))
+        print('Rebuilding %s because %s changed and %s was removed' % (target, ', '.join(newer), ', '.join(removed)))
     elif newer:
-        print 'Rebuilding %s because %s changed' % (target, ', '.join(newer))
+        print('Rebuilding %s because %s changed' % (target, ', '.join(newer)))
     elif removed:
-        print 'Rebuilding %s because %s was removed' % (target, ', '.join(removed))
+        print('Rebuilding %s because %s was removed' % (target, ', '.join(removed)))
     else:
-        print 'Rebuilding %s for an unknown reason' % target
+        print('Rebuilding %s for an unknown reason' % target)
 
 if __name__ == '__main__':
     import sys
--- firefox-52.9.0esr/config/tests/unit-expandlibs.py	(original)
+++ firefox-52.9.0esr/config/tests/unit-expandlibs.py	(refactored)
@@ -7,7 +7,7 @@
 from shutil import rmtree
 import mozunit
 
-from UserString import UserString
+from collections import UserString
 # Create a controlled configuration for use by expandlibs
 config_win = {
     'AR': 'lib',
@@ -120,8 +120,7 @@
             del dict[name]
         return type.__new__(cls, clsName, bases, dict)
 
-class TestCaseWithTmpDir(unittest.TestCase):
-    __metaclass__ = ReplicateTests
+class TestCaseWithTmpDir(unittest.TestCase, metaclass=ReplicateTests):
     def init(self):
         self.tmpdir = os.path.abspath(mkdtemp(dir=os.curdir))
 
--- firefox-52.9.0esr/config/tests/unit-nsinstall.py	(original)
+++ firefox-52.9.0esr/config/tests/unit-nsinstall.py	(refactored)
@@ -28,9 +28,9 @@
         # Unicode strings means non-ASCII children can be deleted properly on
         # Windows
         if sys.stdin.encoding is None:
-            tmpdir = unicode(self.tmpdir)
+            tmpdir = str(self.tmpdir)
         else:
-            tmpdir = unicode(self.tmpdir, sys.stdin.encoding)
+            tmpdir = str(self.tmpdir, sys.stdin.encoding)
         rmtree(tmpdir)
 
     # utility methods for tests
@@ -50,14 +50,14 @@
         "Test nsinstall -D <dir>"
         testdir = os.path.join(self.tmpdir, "test")
         self.assertEqual(nsinstall(["-D", testdir]), 0)
-        self.assert_(os.path.isdir(testdir))
+        self.assertTrue(os.path.isdir(testdir))
 
     def test_nsinstall_basic(self):
         "Test nsinstall <file> <dir>"
         testfile = self.touch("testfile")
         testdir = self.mkdirs("testdir")
         self.assertEqual(nsinstall([testfile, testdir]), 0)
-        self.assert_(os.path.isfile(os.path.join(testdir, "testfile")))
+        self.assertTrue(os.path.isfile(os.path.join(testdir, "testfile")))
 
     def test_nsinstall_basic_recursive(self):
         "Test nsinstall <dir> <dest dir>"
@@ -76,12 +76,12 @@
                                     '-X', Xdir]), 0)
 
         testdir = os.path.join(destdir, "sourcedir")
-        self.assert_(os.path.isdir(testdir))
-        self.assert_(os.path.isfile(os.path.join(testdir, "testfile")))
-        self.assert_(not os.path.exists(os.path.join(testdir, "Xfile")))
-        self.assert_(os.path.isdir(os.path.join(testdir, "copieddir")))
-        self.assert_(os.path.isfile(os.path.join(testdir, "copieddir", "testfile2")))
-        self.assert_(not os.path.exists(os.path.join(testdir, "Xdir")))
+        self.assertTrue(os.path.isdir(testdir))
+        self.assertTrue(os.path.isfile(os.path.join(testdir, "testfile")))
+        self.assertTrue(not os.path.exists(os.path.join(testdir, "Xfile")))
+        self.assertTrue(os.path.isdir(os.path.join(testdir, "copieddir")))
+        self.assertTrue(os.path.isfile(os.path.join(testdir, "copieddir", "testfile2")))
+        self.assertTrue(not os.path.exists(os.path.join(testdir, "Xdir")))
 
     def test_nsinstall_multiple(self):
         "Test nsinstall <three files> <dest dir>"
@@ -91,7 +91,7 @@
         testdir = self.mkdirs("testdir")
         self.assertEqual(nsinstall(testfiles + [testdir]), 0)
         for f in testfiles:
-            self.assert_(os.path.isfile(os.path.join(testdir,
+            self.assertTrue(os.path.isfile(os.path.join(testdir,
                                                      os.path.basename(f))))
 
     def test_nsinstall_dir_exists(self):
@@ -99,7 +99,7 @@
         srcdir = self.mkdirs("test")
         destdir = self.mkdirs("testdir/test")
         self.assertEqual(nsinstall([srcdir, os.path.dirname(destdir)]), 0)
-        self.assert_(os.path.isdir(destdir))
+        self.assertTrue(os.path.isdir(destdir))
 
     def test_nsinstall_t(self):
         "Test that nsinstall -t works (preserve timestamp)"
@@ -110,7 +110,7 @@
         os.utime(testfile, (t, t))
         self.assertEqual(nsinstall(["-t", testfile, testdir]), 0)
         destfile = os.path.join(testdir, "testfile")
-        self.assert_(os.path.isfile(destfile))
+        self.assertTrue(os.path.isfile(destfile))
         self.assertEqual(os.stat(testfile).st_mtime,
                          os.stat(destfile).st_mtime)
 
@@ -125,7 +125,7 @@
             self.assertEqual(nsinstall(["-m", "{0:04o}"
                                         .format(mode), testfile, testdir]), 0)
             destfile = os.path.join(testdir, "testfile")
-            self.assert_(os.path.isfile(destfile))
+            self.assertTrue(os.path.isfile(destfile))
             self.assertEqual(os.stat(testfile).st_mode,
                              os.stat(destfile).st_mode)
 
@@ -136,25 +136,25 @@
         testdir = self.mkdirs("testdir")
         destdir = os.path.join(testdir, "subdir")
         self.assertEqual(nsinstall(["-d", testfile, destdir]), 0)
-        self.assert_(os.path.isdir(os.path.join(destdir, "testfile")))
+        self.assertTrue(os.path.isdir(os.path.join(destdir, "testfile")))
 
     if RUN_NON_ASCII_TESTS:
         def test_nsinstall_non_ascii(self):
             "Test that nsinstall handles non-ASCII files"
-            filename = u"\u2325\u3452\u2415\u5081"
+            filename = "\u2325\u3452\u2415\u5081"
             testfile = self.touch(filename)
-            testdir = self.mkdirs(u"\u4241\u1D04\u1414")
+            testdir = self.mkdirs("\u4241\u1D04\u1414")
             self.assertEqual(nsinstall([testfile.encode("utf-8"),
                                         testdir.encode("utf-8")]), 0)
 
             destfile = os.path.join(testdir, filename)
-            self.assert_(os.path.isfile(destfile))
+            self.assertTrue(os.path.isfile(destfile))
 
         def test_nsinstall_non_ascii_subprocess(self):
             "Test that nsinstall as a subprocess handles non-ASCII files"
-            filename = u"\u2325\u3452\u2415\u5081"
+            filename = "\u2325\u3452\u2415\u5081"
             testfile = self.touch(filename)
-            testdir = self.mkdirs(u"\u4241\u1D04\u1414")
+            testdir = self.mkdirs("\u4241\u1D04\u1414")
             # We don't use subprocess because it can't handle Unicode on
             # Windows <http://bugs.python.org/issue1759845>. mozprocess calls
             # CreateProcessW directly so it's perfect.
@@ -166,7 +166,7 @@
 
             self.assertEqual(rv, 0)
             destfile = os.path.join(testdir, filename)
-            self.assert_(os.path.isfile(destfile))
+            self.assertTrue(os.path.isfile(destfile))
 
     #TODO: implement -R, -l, -L and test them!
 
--- firefox-52.9.0esr/config/tests/unitMozZipFile.py	(original)
+++ firefox-52.9.0esr/config/tests/unitMozZipFile.py	(refactored)
@@ -11,6 +11,7 @@
 import random
 import copy
 from string import letters
+from functools import reduce
 
 '''
 Test case infrastructure for MozZipFile.
@@ -38,7 +39,7 @@
   'firstdir/oneleaf',
   'seconddir/twoleaf',
   'thirddir/with/sub/threeleaf')
-_lengths = map(lambda n: n * 64, [16, 64, 80])
+_lengths = [n * 64 for n in [16, 64, 80]]
 lengths = 3
 writes = 5
 
@@ -71,7 +72,7 @@
 def getContent(length):
   'Get pseudo random content of given length.'
   rv = [None] * length
-  for i in xrange(length):
+  for i in range(length):
     rv[i] = random.choice(letters)
   return ''.join(rv)
 
@@ -133,13 +134,13 @@
   def _verifyZip(self):
     zf = zipfile.ZipFile(self.f)
     badEntry = zf.testzip()
-    self.failIf(badEntry, badEntry)
+    self.assertFalse(badEntry, badEntry)
     zlist = zf.namelist()
     zlist.sort()
-    vlist = self.ref.keys()
+    vlist = list(self.ref.keys())
     vlist.sort()
     self.assertEqual(zlist, vlist)
-    for leaf, content in self.ref.iteritems():
+    for leaf, content in self.ref.items():
       zcontent = zf.read(leaf)
       self.assertEqual(content, zcontent)
   
@@ -158,16 +159,16 @@
     open(self.leaf('stage', leaf), 'w').write(content)
 
 # all leafs in all lengths
-atomics = list(prod(xrange(len(leafs)), xrange(lengths)))
+atomics = list(prod(range(len(leafs)), range(lengths)))
 
 # populate TestExtensiveStore with testcases
-for w in xrange(writes):
+for w in range(writes):
   # Don't iterate over all files for the the first n passes,
   # those are redundant as long as w < lengths.
   # There are symmetries in the trailing end, too, but I don't know
   # how to reduce those out right now.
-  nonatomics = [list(prod(range(min(i,len(leafs))), xrange(lengths)))
-                for i in xrange(1, w+1)] + [atomics]
+  nonatomics = [list(prod(list(range(min(i,len(leafs)))), range(lengths)))
+                for i in range(1, w+1)] + [atomics]
   for descs in prod(*nonatomics):
     suffix = getid(descs)
     dicts = [dict(leaf=leaf, length=length) for leaf, length in descs]
@@ -181,9 +182,9 @@
 # and then write all atomics again.
 # This should catch more or less all artifacts generated
 # by the final ordering step when closing the jar.
-files = [list(prod([i], xrange(lengths))) for i in xrange(len(leafs))]
+files = [list(prod([i], range(lengths))) for i in range(len(leafs))]
 allfiles = reduce(lambda l,r:l+r,
-                  [list(prod(*files[:(i+1)])) for i in xrange(len(leafs))])
+                  [list(prod(*files[:(i+1)])) for i in range(len(leafs))])
 
 for first in allfiles:
   testbasename = 'test{0}_'.format(getid(first))
--- firefox-52.9.0esr/config/expandlibs_exec.py.old	2018-07-11 05:07:18.280000000 +0000
+++ firefox-52.9.0esr/config/expandlibs_exec.py	2018-07-11 05:08:45.670000000 +0000
@@ -344,7 +344,7 @@
         (stdout, stderr) = proc.communicate()
         if proc.returncode and not options.verbose:
             print_command(sys.stderr, args)
-        sys.stderr.write(stdout)
+        sys.stderr.write(stdout.decode('utf-8'))
         sys.stderr.flush()
         if proc.returncode:
             return proc.returncode
--- firefox-52.9.0esr/js/src/jsautokw.py.old	2017-04-11 02:13:16.000000000 +0000
+++ firefox-52.9.0esr/js/src/jsautokw.py	2018-07-11 05:11:27.080000000 +0000
@@ -80,14 +80,14 @@
         per_column = column_dict.setdefault(keyword[column], [])
         per_column.append(item)
 
-    return sorted(column_dict.items(), key=lambda (char, keyword): ord(char))
+    return sorted(list(column_dict.items()), key=lambda char_keyword: ord(char_keyword[0]))
 
 def generate_letter_switch(opt, unprocessed_columns, keyword_list,
                            columns=None):
     assert(len(keyword_list) != 0);
 
     if not columns:
-        columns = range(0, unprocessed_columns)
+        columns = list(range(0, unprocessed_columns))
 
     if len(keyword_list) == 1:
         index, keyword = keyword_list[0]
@@ -161,7 +161,7 @@
         per_length = length_dict.setdefault(len(keyword), [])
         per_length.append(item)
 
-    return sorted(length_dict.items(), key=lambda (length, keyword): length)
+    return sorted(list(length_dict.items()), key=lambda length_keyword: length_keyword[0])
 
 def generate_switch(opt, keyword_list):
     assert(len(keyword_list) != 0);
--- firefox-52.9.0esr/js/src/builtin/embedjs.py	(original)
+++ firefox-52.9.0esr/js/src/builtin/embedjs.py	(refactored)
@@ -36,7 +36,7 @@
 #
 # It uses the C preprocessor to process its inputs.
 
-from __future__ import with_statement
+
 import re, sys, os, subprocess
 import shlex
 import which
@@ -109,7 +109,7 @@
 
   with open(tmpIn, 'wb') as input:
     input.write(source)
-  print(' '.join(cxx + outputArg + args + [tmpIn]))
+  print((' '.join(cxx + outputArg + args + [tmpIn])))
   result = subprocess.Popen(cxx + outputArg + args + [tmpIn]).wait()
   if (result != 0):
     sys.exit(result);
@@ -132,7 +132,7 @@
 
 def get_config_defines(buildconfig):
   # Collect defines equivalent to ACDEFINES and add MOZ_DEBUG_DEFINES.
-  env = {key: value for key, value in buildconfig.defines.iteritems()
+  env = {key: value for key, value in buildconfig.defines.items()
          if key not in buildconfig.non_global_defines}
   for define in buildconfig.substs['MOZ_DEBUG_DEFINES']:
     env[define] = 1
--- firefox-52.9.0esr/js/src/builtin/embedjs.py.old	2018-07-11 05:13:28.920000000 +0000
+++ firefox-52.9.0esr/js/src/builtin/embedjs.py	2018-07-11 05:15:15.390000000 +0000
@@ -107,7 +107,7 @@
   tmpOut = 'self-hosting-preprocessed.pp';
   outputArg = shlex.split(preprocessorOption + tmpOut)
 
-  with open(tmpIn, 'wb') as input:
+  with open(tmpIn, 'w') as input:
     input.write(source)
   print((' '.join(cxx + outputArg + args + [tmpIn])))
   result = subprocess.Popen(cxx + outputArg + args + [tmpIn]).wait()
--- firefox-52.9.0esr/python/mozbuild/mozbuild/preprocessor.py.old	2018-07-11 05:15:42.900000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/preprocessor.py	2018-07-11 05:23:10.870000000 +0000
@@ -451,7 +451,7 @@
                 except OSError as error:
                     if error.errno != errno.EEXIST:
                         raise
-            return open(path, 'wb')
+            return open(path, 'w')
 
         p = self.getCommandLineParser()
         options, args = p.parse_args(args=args)
--- firefox-52.9.0esr/js/src/builtin/embedjs.py.old	2018-07-11 05:15:42.950000000 +0000
+++ firefox-52.9.0esr/js/src/builtin/embedjs.py	2018-07-11 05:20:14.280000000 +0000
@@ -53,7 +53,7 @@
 def ToCArray(lines):
   result = []
   for chr in lines:
-    result.append(str(ord(chr)))
+    result.append(str(chr))
   return ", ".join(result)
 
 HEADER_TEMPLATE = """\
@@ -87,7 +87,7 @@
 
   js_out.write(processed)
   import zlib
-  compressed = zlib.compress(processed)
+  compressed = zlib.compress(processed.encode('utf-8'))
   data = ToCArray(compressed)
   c_out.write(HEADER_TEMPLATE % {
     'sources_type': 'unsigned char',
--- firefox-52.9.0esr/build/mach_bootstrap.py.old	2018-06-29 23:00:39.000000000 +0000
+++ firefox-52.9.0esr/build/mach_bootstrap.py	2018-07-26 00:41:17.740000000 +0000
@@ -12,7 +12,7 @@
 import subprocess
 import sys
 import uuid
-import __builtin__
+import builtins
 
 from types import ModuleType
 
@@ -187,10 +187,10 @@
     # Ensure we are running Python 2.7+. We put this check here so we generate a
     # user-friendly error message rather than a cryptic stack trace on module
     # import.
-    if sys.version_info[0] != 2 or sys.version_info[1] < 7:
-        print('Python 2.7 or above (but not Python 3) is required to run mach.')
-        print('You are running Python', platform.python_version())
-        sys.exit(1)
+    #if sys.version_info[0] != 2 or sys.version_info[1] < 7:
+    #    print('Python 2.7 or above (but not Python 3) is required to run mach.')
+    #    print('You are running Python', platform.python_version())
+    #    sys.exit(1)
 
     # Global build system and mach state is stored in a central directory. By
     # default, this is ~/.mozbuild. However, it can be defined via an
@@ -410,4 +410,4 @@
 
 
 # Install our hook
-__builtin__.__import__ = ImportHook(__builtin__.__import__)
+builtins.__import__ = ImportHook(builtins.__import__)
--- firefox-52.9.0esr/python/mach/mach/config.py	(original)
+++ firefox-52.9.0esr/python/mach/mach/config.py	(refactored)
@@ -163,7 +163,7 @@
             return func(*args, **kwargs)
         except KeyError:
             exc_class, exc, tb = sys.exc_info()
-            raise AttributeError().__class__, exc, tb
+            raise AttributeError().__class__(exc).with_traceback(tb)
     return _
 
 
@@ -357,7 +357,7 @@
             extra -- A dict of additional key/value pairs to add to the
                 setting metadata.
         """
-        if isinstance(type_cls, basestring):
+        if isinstance(type_cls, str_type):
             type_cls = TYPE_CLASSES[type_cls]
 
         meta = {
@@ -397,10 +397,10 @@
             meta = self._format_metadata(provider, section, option, *setting[1:])
             config_settings[section][option] = meta
 
-        for section_name, settings in config_settings.items():
+        for section_name, settings in list(config_settings.items()):
             section = self._settings.get(section_name, {})
 
-            for k, v in settings.items():
+            for k, v in list(settings.items()):
                 if k in section:
                     raise ConfigException('Setting already registered: %s.%s' %
                                           section_name, k)
@@ -432,7 +432,7 @@
         if self._finalized:
             return
 
-        for section, settings in self._settings.items():
+        for section, settings in list(self._settings.items()):
             s = ConfigSettings.ConfigSection(self._config, section, settings)
             self._sections[section] = s
 
@@ -445,7 +445,7 @@
     def __iter__(self):
         self._finalize()
 
-        return iter(self._sections.keys())
+        return iter(list(self._sections.keys()))
 
     def __contains__(self, k):
         return k in self._settings
--- firefox-52.9.0esr/python/mach/mach/dispatcher.py	(original)
+++ firefox-52.9.0esr/python/mach/mach/dispatcher.py	(refactored)
@@ -243,7 +243,7 @@
         r = self._mach_registrar
         disabled_commands = []
 
-        cats = [(k, v[2]) for k, v in r.categories.items()]
+        cats = [(k, v[2]) for k, v in list(r.categories.items())]
         sorted_cats = sorted(cats, key=itemgetter(1), reverse=True)
         for category, priority in sorted_cats:
             group = None
@@ -375,7 +375,7 @@
             ' subcommand [subcommand arguments]'
         group = parser.add_argument_group('Sub Commands')
 
-        for subcommand, subhandler in sorted(handler.subcommand_handlers.iteritems()):
+        for subcommand, subhandler in sorted(handler.subcommand_handlers.items()):
             group.add_argument(subcommand, help=subhandler.description,
                 action='store_true')
 
@@ -406,7 +406,7 @@
 
     def _suggest_command(self, command):
         # Make sure we don't suggest any deprecated commands.
-        names = [h.name for h in self._mach_registrar.command_handlers.values()
+        names = [h.name for h in list(self._mach_registrar.command_handlers.values())
                     if h.cls.__name__ != 'DeprecatedCommands']
         # We first try to look for a valid command that is very similar to the given command.
         suggested_commands = difflib.get_close_matches(command, names, cutoff=0.8)
@@ -437,13 +437,13 @@
     if not docstring:
         return ''
     lines = docstring.expandtabs().splitlines()
-    indent = sys.maxint
+    indent = sys.maxsize
     for line in lines[1:]:
         stripped = line.lstrip()
         if stripped:
             indent = min(indent, len(line) - len(stripped))
     trimmed = [lines[0].strip()]
-    if indent < sys.maxint:
+    if indent < sys.maxsize:
         for line in lines[1:]:
             trimmed.append(line[indent:].rstrip())
     while trimmed and not trimmed[-1]:
--- firefox-52.9.0esr/python/mach/mach/main.py	(original)
+++ firefox-52.9.0esr/python/mach/mach/main.py	(refactored)
@@ -528,7 +528,7 @@
 
             machrc, .machrc
         """
-        if isinstance(paths, basestring):
+        if isinstance(paths, str):
             paths = [paths]
 
         valid_names = ('machrc', '.machrc')
@@ -541,8 +541,8 @@
                 if os.path.isfile(path):
                     return path
 
-        files = map(find_in_dir, self.settings_paths)
-        files = filter(bool, files)
+        files = list(map(find_in_dir, self.settings_paths))
+        files = list(filter(bool, files))
 
         self.settings.load_files(files)
 
--- firefox-52.9.0esr/python/mach/mach/registrar.py	(original)
+++ firefox-52.9.0esr/python/mach/mach/registrar.py	(refactored)
@@ -90,7 +90,7 @@
             result = fn(**kwargs)
 
         result = result or 0
-        assert isinstance(result, (int, long))
+        assert isinstance(result, int)
 
         if context:
             postrun = getattr(context, 'post_dispatch_handler', None)
--- firefox-52.9.0esr/python/mach/mach/terminal.py	(original)
+++ firefox-52.9.0esr/python/mach/mach/terminal.py	(refactored)
@@ -59,7 +59,7 @@
         self.fh = sys.stdout
 
     def _clear_lines(self, n):
-        for i in xrange(n):
+        for i in range(n):
             self.fh.write(self.t.move_x(0))
             self.fh.write(self.t.clear_eol())
             self.fh.write(self.t.move_up())
--- firefox-52.9.0esr/python/mach/mach/main.py.old	2018-07-26 00:55:29.330000000 +0000
+++ firefox-52.9.0esr/python/mach/mach/main.py	2018-07-26 00:57:01.260000000 +0000
@@ -256,9 +256,9 @@
         if module_name is None:
             # Ensure parent module is present otherwise we'll (likely) get
             # an error due to unknown parent.
-            if b'mach.commands' not in sys.modules:
-                mod = imp.new_module(b'mach.commands')
-                sys.modules[b'mach.commands'] = mod
+            if 'mach.commands' not in sys.modules:
+                mod = imp.new_module('mach.commands')
+                sys.modules['mach.commands'] = mod
 
             module_name = 'mach.commands.%s' % uuid.uuid1().get_hex()
 
@@ -347,7 +347,7 @@
             # is a TTY. This provides a mechanism to allow said processes to
             # enable emitting code codes, for example.
             if os.isatty(orig_stdout.fileno()):
-                os.environ[b'MACH_STDOUT_ISATTY'] = b'1'
+                os.environ['MACH_STDOUT_ISATTY'] = '1'
 
             return self._run(argv)
         except KeyboardInterrupt:
--- firefox-52.9.0esr/toolkit/moz.configure.old	2017-04-11 02:13:23.000000000 +0000
+++ firefox-52.9.0esr/toolkit/moz.configure	2018-07-26 05:32:08.590000000 +0000
@@ -690,7 +690,7 @@
 # ==============================================================
 @depends(check_build_environment, '--help')
 @imports('os')
-@imports(_from='__builtin__', _import='sorted')
+@imports(_from='builtins', _import='sorted')
 def all_necko_protocols(build_env, _):
     basedir = os.path.join(build_env.topsrcdir, 'netwerk', 'protocol')
     return tuple(sorted(p for p in os.listdir(basedir)
@@ -744,7 +744,7 @@
         __sandbox__.set_define_impl(p, True)
 
 @depends('--enable-network-protocols')
-@imports(_from='__builtin__', _import='sorted')
+@imports(_from='builtins', _import='sorted')
 def necko_protocols(protocols):
     return tuple(sorted(protocols))
 
--- firefox-52.9.0esr/build/moz.configure/pkg.configure.old	2017-04-11 02:13:08.000000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/pkg.configure	2018-07-26 05:36:10.990000000 +0000
@@ -84,6 +84,8 @@
     @checking('%s_LIBS' % var, callback=lambda t: ' '.join(t))
     def pkg_libs(pkg_config, package_desc):
         libs = check_cmd_output(pkg_config, '--libs', package_desc)
+        if isinstance(libs, bytes):
+            libs = libs.decode('utf-8')
         # Remove evil flags like -Wl,--export-dynamic
         return tuple(libs.replace('-Wl,--export-dynamic', '').split())
 
--- firefox-52.9.0esr/build/moz.configure/pkg.configure.old	2018-07-26 05:37:14.580000000 +0000
+++ firefox-52.9.0esr/build/moz.configure/pkg.configure	2018-07-26 05:38:48.750000000 +0000
@@ -78,6 +78,8 @@
     @checking('%s_CFLAGS' % var, callback=lambda t: ' '.join(t))
     def pkg_cflags(pkg_config, package_desc):
         flags = check_cmd_output(pkg_config, '--cflags', package_desc)
+        if isinstance(flags, bytes):
+            flags = flags.decode('utf-8')
         return tuple(flags.split())
 
     @depends_when(pkg_config, package_desc, when=package)
--- firefox-52.9.0esr/build/subconfigure.py.old	2018-07-26 05:39:27.360000000 +0000
+++ firefox-52.9.0esr/build/subconfigure.py	2018-07-26 09:58:41.110000000 +0000
@@ -39,7 +39,7 @@
 class File(object):
     def __init__(self, path):
         self._path = path
-        self._content = open(path, 'rb').read()
+        self._content = open(path, 'r').read()
         stat = os.stat(path)
         self._times = (stat.st_atime, stat.st_mtime)
 
@@ -60,7 +60,7 @@
 
         modified = True
         if os.path.exists(self._path):
-            if open(self._path, 'rb').read() == self._content:
+            if open(self._path, 'r').read() == self._content:
                 modified = False
         self._modified = modified
         return modified
@@ -221,7 +221,7 @@
                 environ[var] = os.environ[var]
         args = data['args']
     else:
-        environ = os.environ
+        environ = dict(os.environ)
 
     args, others = parser.parse_known_args(args)
 
@@ -260,7 +260,7 @@
 
 def run(objdir):
     ret = 0
-    output = ''
+    output = b''
 
     with open(os.path.join(objdir, CONFIGURE_DATA), 'rb') as f:
         data = pickle.load(f)
@@ -381,7 +381,7 @@
         for f in contents:
             f.update_time()
 
-    return relobjdir, ret, output
+    return relobjdir, ret, output.decode('utf-8')
 
 
 def subconfigure(args):
@@ -395,9 +395,9 @@
     args, others = parser.parse_known_args(args)
     subconfigures = args.subconfigures
     if args.list:
-        subconfigures.extend(open(args.list, 'rb').read().splitlines())
+        subconfigures.extend(open(args.list, 'r').read().splitlines())
     if args.skip:
-        skips = set(open(args.skip, 'rb').read().splitlines())
+        skips = set(open(args.skip, 'r').read().splitlines())
         subconfigures = [s for s in subconfigures if s not in skips]
 
     if not subconfigures:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/util.py.old	2018-07-26 10:43:58.540000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/util.py	2018-07-26 10:57:09.100000000 +0000
@@ -1228,7 +1228,7 @@
             yield 'b'
             yield repr(o)
         elif isinstance(o, str):
-            yield "'"
+            yield "'''"
             # We want a readable string (non escaped unicode), but some
             # special characters need escaping (e.g. \n, \t, etc.)
             for i, s in enumerate(_INDENTED_REPR_RE.split(o)):
@@ -1237,7 +1237,7 @@
                         yield _INDENTED_REPR_TABLE[c]
                 else:
                     yield s
-            yield "'"
+            yield "'''"
         elif hasattr(o, '__iter__'):
             yield '[\n'
             for i in o:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py.old	2018-07-26 10:43:58.540000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py	2018-07-26 10:49:10.780000000 +0000
@@ -148,6 +148,8 @@
                     self._stdout.flush()
                 stream = self._stderr
                 msg = '%s\n' % self.format(record)
+            if isinstance(msg, bytes):
+                msg = msg.decode('utf-8')
             stream.write(msg)
             stream.flush()
         except (KeyboardInterrupt, SystemExit):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py.old	2018-07-26 10:58:24.910000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/util.py	2018-07-26 11:08:15.430000000 +0000
@@ -89,8 +89,8 @@
                     return codecs.getwriter(encoding)(fh)
             return fh
 
-        self._stdout = fix_encoding(stdout)
-        self._stderr = fix_encoding(stderr) if stdout != stderr else self._stdout
+        self._stdout = stdout
+        self._stderr = stderr if stdout != stderr else self._stdout
         try:
             fd1 = self._stdout.fileno()
             fd2 = self._stderr.fileno()
@@ -148,8 +148,6 @@
                     self._stdout.flush()
                 stream = self._stderr
                 msg = '%s\n' % self.format(record)
-            if isinstance(msg, bytes):
-                msg = msg.decode('utf-8')
             stream.write(msg)
             stream.flush()
         except (KeyboardInterrupt, SystemExit):
--- firefox-52.9.0esr/build/mach_bootstrap.py.old	2018-07-26 10:58:24.910000000 +0000
+++ firefox-52.9.0esr/build/mach_bootstrap.py	2018-07-26 11:09:30.620000000 +0000
@@ -361,7 +361,7 @@
         self._modules = set()
 
     def __call__(self, name, globals=None, locals=None, fromlist=None,
-                 level=-1):
+                 level=0):
         # name might be a relative import. Instead of figuring out what that
         # resolves to, which is complex, just rely on the real import.
         # Since we don't know the full module name, we can't check sys.modules,
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/check_debug_ranges.py.old	2018-07-26 11:10:15.820000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/check_debug_ranges.py	2018-07-26 11:14:51.180000000 +0000
@@ -45,6 +45,7 @@
 def main(bin, compilation_unit):
     p = subprocess.Popen(['objdump', '-W', bin], stdout = subprocess.PIPE, stderr = subprocess.PIPE)
     (out, err) = p.communicate()
+    out = out.decode('utf-8')
     sections = re.split('\n(Contents of the|The section) ', out)
     debug_info = [s for s in sections if s.startswith('.debug_info')]
     debug_ranges = [s for s in sections if s.startswith('.debug_ranges')]
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py.old	2018-07-26 11:10:15.820000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py	2018-07-26 11:18:03.750000000 +0000
@@ -28,6 +28,7 @@
 )
 
 Kernel = EnumString.subclass(
+    'Android',
     'Darwin',
     'DragonFly',
     'FreeBSD',
@@ -90,6 +91,7 @@
 assert sorted(CPU_preprocessor_checks.keys()) == sorted(CPU.POSSIBLE_VALUES)
 
 kernel_preprocessor_checks = {
+    'Android': '__BIONIC__',
     'Darwin': '__APPLE__',
     'DragonFly': '__DragonFly__',
     'FreeBSD': '__FreeBSD__',
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py.old	2018-07-26 11:18:54.630000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py	2018-07-26 23:46:48.880000000 +0000
@@ -28,6 +28,7 @@
 )
 
 Kernel = EnumString.subclass(
+    'AIX',
     'Android',
     'Darwin',
     'DragonFly',
@@ -91,6 +92,7 @@
 assert sorted(CPU_preprocessor_checks.keys()) == sorted(CPU.POSSIBLE_VALUES)
 
 kernel_preprocessor_checks = {
+    'AIX': '_AIX',
     'Android': '__BIONIC__',
     'Darwin': '__APPLE__',
     'DragonFly': '__DragonFly__',
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py.old	2018-07-26 23:47:39.060000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py	2018-07-26 23:53:25.260000000 +0000
@@ -37,6 +37,8 @@
     'Linux',
     'NetBSD',
     'OpenBSD',
+    'SunOS',
+    'HP-UX',
     'WINNT',
 )
 
@@ -93,14 +94,16 @@
 
 kernel_preprocessor_checks = {
     'AIX': '_AIX',
-    'Android': '__BIONIC__',
+    'Android': '__ANDROID__',
     'Darwin': '__APPLE__',
     'DragonFly': '__DragonFly__',
     'FreeBSD': '__FreeBSD__',
+    'HP-UX': '_hpux',
     'kFreeBSD': '__FreeBSD_kernel__',
     'Linux': '__linux__',
     'NetBSD': '__NetBSD__',
     'OpenBSD': '__OpenBSD__',
+    'SunOS': '__sun || sun',
     'WINNT': '_WIN32 || __CYGWIN__',
 }
 
--- firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py.old	2018-07-26 23:55:19.000000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/configure/constants.py	2018-07-26 23:58:36.750000000 +0000
@@ -33,12 +33,15 @@
     'Darwin',
     'DragonFly',
     'FreeBSD',
+    'GNU',
+    'GNU/kFreeBSD',
+    'GNU_kFreeBSD',
+    'HP-UX',
     'kFreeBSD',
     'Linux',
     'NetBSD',
     'OpenBSD',
     'SunOS',
-    'HP-UX',
     'WINNT',
 )
 
@@ -99,6 +102,9 @@
     'Darwin': '__APPLE__',
     'DragonFly': '__DragonFly__',
     'FreeBSD': '__FreeBSD__',
+    'GNU': '__gnu_hurd__',
+    'GNU/kFreeBSD': '__FreeBSD_kernel_ && __GLIBC__',
+    'GNU_kFreeBSD': '__FreeBSD_kernel_ && __GLIBC__',
     'HP-UX': '_hpux',
     'kFreeBSD': '__FreeBSD_kernel__',
     'Linux': '__linux__',
--- firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/ini.py.old	2018-07-26 23:55:18.990000000 +0000
+++ firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/ini.py	2018-07-27 00:04:47.460000000 +0000
@@ -33,7 +33,7 @@
     # read the lines
     for (linenum, line) in enumerate(fp.read().splitlines(), start=1):
 
-        stripped = line.strip()
+        stripped = line.strip().decode('utf-8')
 
         # ignore blank lines
         if not stripped:
--- firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/ini.py.old	2018-07-27 00:09:00.850000000 +0000
+++ firefox-52.9.0esr/testing/mozbase/manifestparser/manifestparser/ini.py	2018-07-27 00:12:03.920000000 +0000
@@ -31,9 +31,9 @@
         fp = open(fp)
 
     # read the lines
-    for (linenum, line) in enumerate(fp.read().splitlines(), start=1):
+    for (linenum, line) in enumerate(fp.read().decode('utf-8').splitlines(), start=1):
 
-        stripped = line.strip().decode('utf-8')
+        stripped = line.strip()
 
         # ignore blank lines
         if not stripped:
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/sandbox.py.old	2018-07-27 00:12:52.240000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/sandbox.py	2018-07-27 00:18:00.010000000 +0000
@@ -39,7 +39,8 @@
     """sorted() replacement for the sandbox, ordering alphabetically by
     default.
     """
-    return sorted(iterable, cmp, key, reverse)
+    ### XXX what do we do with cmp?
+    return sorted(iterable, key=key, reverse=reverse)
 
 
 class SandboxError(Exception):
--- firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/emitter.py.old	2018-07-27 00:32:50.870000000 +0000
+++ firefox-52.9.0esr/python/mozbuild/mozbuild/frontend/emitter.py	2018-07-27 00:32:28.770000000 +0000
@@ -1399,7 +1399,8 @@
         # declared anywhere (they were discovered). This will detect people
         # relying on the old behavior.
         if os.path.exists(os.path.join(context.srcdir, 'jar.mn')):
-            if 'jar.mn' not in jar_manifests:
+            if 'jar.mn' not in jar_manifests and \
+                SourcePath(context, 'jar.mn') not in jar_manifests:
                 raise SandboxValidationError('A jar.mn exists but it '
                     'is not referenced in the moz.build file. '
                     'Please define JAR_MANIFESTS.', context)