diff -up firefox-29.0/mozilla-release/gfx/ycbcr/moz.build.arm firefox-29.0/mozilla-release/gfx/ycbcr/moz.build
--- firefox-29.0/mozilla-release/gfx/ycbcr/moz.build.arm	2014-04-22 07:27:47.000000000 +0200
+++ firefox-29.0/mozilla-release/gfx/ycbcr/moz.build	2014-04-22 16:40:34.862849368 +0200
@@ -61,7 +61,7 @@ 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',
     ]