diff -r 000000000000 -r 6474c204b198 browser/config/mozconfigs/macosx-universal/nightly
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/config/mozconfigs/macosx-universal/nightly	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+. "$topsrcdir/browser/config/mozconfigs/macosx-universal/common-opt"
+
+ac_add_options --disable-install-strip
+ac_add_options --enable-signmar
+
+ac_add_options --enable-instruments
+ac_add_options --enable-dtrace
+
+# Nightlies only since this has a cost in performance
+ac_add_options --enable-js-diagnostics
+
+ac_add_options --with-macbundlename-prefix=Firefox
+
+. "$topsrcdir/build/mozconfig.common.override"