--- firefox-91.13.0/config/makefiles/rust.mk.old	2022-08-15 13:04:32.000000000 -0500
+++ firefox-91.13.0/config/makefiles/rust.mk	2022-11-15 01:35:10.150096648 -0600
@@ -64,19 +64,19 @@
 # These flags are passed via `cargo rustc` and only apply to the final rustc
 # invocation (i.e., only the top-level crate, not its dependencies).
 cargo_rustc_flags = $(CARGO_RUSTCFLAGS)
-ifndef DEVELOPER_OPTIONS
-ifndef MOZ_DEBUG_RUST
+#ifndef DEVELOPER_OPTIONS
+#ifndef MOZ_DEBUG_RUST
 # Enable link-time optimization for release builds, but not when linking
 # gkrust_gtest. And not when doing cross-language LTO.
-ifndef MOZ_LTO_RUST_CROSS
-ifeq (,$(findstring gkrust_gtest,$(RUST_LIBRARY_FILE)))
-cargo_rustc_flags += -Clto
-endif
+#ifndef MOZ_LTO_RUST_CROSS
+#ifeq (,$(findstring gkrust_gtest,$(RUST_LIBRARY_FILE)))
+#cargo_rustc_flags += -Clto
+#endif
 # We need -Cembed-bitcode=yes for all crates when using -Clto.
-RUSTFLAGS += -Cembed-bitcode=yes
-endif
-endif
-endif
+#RUSTFLAGS += -Cembed-bitcode=yes
+#endif
+#endif
+#endif
 
 ifdef CARGO_INCREMENTAL
 export CARGO_INCREMENTAL