diff --git a/firefox-build.patch b/firefox-build.patch
new file mode 100644
index 0000000..262337c
--- /dev/null
+++ b/firefox-build.patch
@@ -0,0 +1,11 @@
+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',
diff --git a/firefox.spec b/firefox.spec
index 57d1f54..fc6fcca 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -104,6 +104,7 @@ Source23:       firefox.1
 
 #Build patches
 Patch0:         firefox-install-dir.patch
+Patch1:         firefox-build.patch
 Patch3:         mozilla-build-arm.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=814879#c3
 Patch18:        xulrunner-24.0-jemalloc-ppc.patch
@@ -215,6 +216,7 @@ cd %{tarballdir}
 # there is a compare of config and js/config directories and .orig suffix is 
 # ignored during this compare.
 %patch0 -p1
+%patch1 -p2 -b .build
 
 %ifarch %{arm}
 %patch3  -p2 -b .arm
@@ -356,6 +358,8 @@ find ./ -name config.guess -exec cp /usr/lib/rpm/config.guess {} ';'
 #
 MOZ_OPT_FLAGS=$(echo "$RPM_OPT_FLAGS" | %{__sed} -e 's/-Wall//')
 #rhbz#1037063
+# -Werror=format-security causes build failures when -Wno-format is explicitly given
+# for some sources
 MOZ_OPT_FLAGS="$MOZ_OPT_FLAGS -Wformat-security -Wformat -Werror=format-security"
 %if %{?debug_build}
 MOZ_OPT_FLAGS=$(echo "$MOZ_OPT_FLAGS" | %{__sed} -e 's/-O2//')