diff -up firefox-28.0/mozilla-release/gfx/ycbcr/moz.build.arm firefox-28.0/mozilla-release/gfx/ycbcr/moz.build
--- firefox-28.0/mozilla-release/gfx/ycbcr/moz.build.arm	2014-03-11 01:54:04.000000000 +0100
+++ firefox-28.0/mozilla-release/gfx/ycbcr/moz.build	2014-03-11 10:12:19.586220802 +0100
@@ -59,7 +59,7 @@ else:
         'yuv_row_other.cpp',
     ]
 
-if CONFIG['CPU_ARCH'] == 'arm' and CONFIG['HAVE_ARM_NEON']:
+if CONFIG['HAVE_ARM_NEON']:
     SOURCES += [
         'yuv_row_arm.s',
     ]
diff -up firefox-28.0/mozilla-release/media/libtheora/lib/moz.build.arm firefox-28.0/mozilla-release/media/libtheora/lib/moz.build
--- firefox-28.0/mozilla-release/media/libtheora/lib/moz.build.arm	2014-03-11 01:54:13.000000000 +0100
+++ firefox-28.0/mozilla-release/media/libtheora/lib/moz.build	2014-03-19 12:00:57.491064764 +0100
@@ -20,7 +20,7 @@ UNIFIED_SOURCES += [
     'state.c',
 ]
 
-if CONFIG['OS_TEST'] == 'arm' and CONFIG['GNU_AS']:
+if CONFIG['GNU_AS']:
     GENERATED_SOURCES += [ '%s.%s' % (f, CONFIG['ASM_SUFFIX']) for f in [
         'armbits-gnu',
         'armfrag-gnu',