--- firefox-102.1.0/gfx/2d/DrawTargetSkia.cpp
+++ firefox-102.1.0/gfx/2d/DrawTargetSkia.cpp
@@ -155,8 +155,12 @@ }
   return surfaceBounds.Intersect(bounds);
 }
 
+#if MOZ_BIG_ENDIAN
+static const int kARGBAlphaOffset = 0;
+#else
 static const int kARGBAlphaOffset =
     SurfaceFormat::A8R8G8B8_UINT32 == SurfaceFormat::B8G8R8A8 ? 3 : 0;
+#endif
 
 static bool VerifyRGBXFormat(uint8_t* aData, const IntSize& aSize,
                              const int32_t aStride, SurfaceFormat aFormat) {
# HG changeset patch
# Parent  46ea866ca3acb8bb5e1709ceb799b9c94f591dec
Problem description: Tab-titles that are too long to fit into a tab get faded out.
                     On big endian this is broken and instead of fading out, the 
                     tab gets white and the font transparent, leading to an unreadable
                     tab-title
Solution: This is not a real solution, but a hack. The real solution would have been
          to byte-swap the correct buffer, but I could not find it.
          So the next best thing is to deactivate the fading-effect. Now all tab-titles
          are readable, albeit not as pretty to look at as they could be. 
Side-effects: I have not yet found an unwanted side-effect.

diff -r 46ea866ca3ac -r 6ef20eee3f8f gfx/2d/DrawTargetSkia.cpp
--- a/gfx/2d/DrawTargetSkia.cpp	Tue Oct 22 12:27:22 2019 +0200
+++ b/gfx/2d/DrawTargetSkia.cpp	Thu Oct 31 09:11:56 2019 +0100
@@ -2011,6 +2011,14 @@
       SkCanvas::kPreserveLCDText_SaveLayerFlag |
           (aCopyBackground ? SkCanvas::kInitWithPrevious_SaveLayerFlag : 0));
 
+#if MOZ_BIG_ENDIAN
+  // Pushing a layer where an aMask is defined produces wrong output.
+  // We _should_ endian swap the data, but I couldn't find a workable way to do so
+  // Therefore I deactivate those layers in the meantime.
+  // The result is: Tab-titles that are longer than the available space should be faded out.
+  //                The fading doesn't work, so we deactivate the fading-effect here.
+  if (!aMask)
+#endif
   mCanvas->saveLayer(saveRec);
 
   SetPermitSubpixelAA(aOpaque);