diff --git a/b2g/dev/config/mozconfigs/macosx-universal/mulet b/b2g/dev/config/mozconfigs/macosx-universal/mulet
new file mode 100644
index 000000000000..84733a884933
--- /dev/null
+++ b/b2g/dev/config/mozconfigs/macosx-universal/mulet
@@ -0,0 +1,3 @@
+. "$topsrcdir/browser/config/mozconfigs/macosx-universal/nightly"
+
+ac_add_options --enable-application=b2g/dev