diff -r 000000000000 -r 6474c204b198 browser/config/mozconfigs/linux64/release
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/config/mozconfigs/linux64/release	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+# This make file should be identical to the beta mozconfig, apart from the
+# safeguard below
+. "$topsrcdir/browser/config/mozconfigs/linux64/common-opt"
+
+ac_add_options --enable-official-branding
+
+mk_add_options MOZ_PGO=1
+
+# safeguard against someone forgetting to re-set EARLY_BETA_OR_EARLIER in
+# defines.sh during the beta cycle
+export BUILDING_RELEASE=1
+
+. "$topsrcdir/build/mozconfig.common.override"