diff -up firefox-32.0/mozilla-release/media/libstagefright/moz.build.old firefox-32.0/mozilla-release/media/libstagefright/moz.build

--- firefox-32.0/mozilla-release/media/libstagefright/moz.build.old	2014-08-26 05:38:08.000000000 +0200

+++ firefox-32.0/mozilla-release/media/libstagefright/moz.build	2014-08-27 15:40:12.030299348 +0200

@@ -120,7 +120,6 @@ elif CONFIG['GNU_CXX']:

         '-Wno-sign-compare'

     ]

     CXXFLAGS += [

-        '-Wno-format',

         '-Wno-multichar',

         '-Wno-sign-compare',

         '-Wno-unused',