--- a/browser/app/Makefile.in
+++ b/browser/app/Makefile.in
@@ -102,9 +102,9 @@ ifdef MOZ_UPDATER
 	mv -f $(dist_dest)/Contents/MacOS/updater.app/Contents/MacOS/org.mozilla.updater $(dist_dest)/Contents/Library/LaunchServices
 	ln -s ../../../../Library/LaunchServices/org.mozilla.updater $(dist_dest)/Contents/MacOS/updater.app/Contents/MacOS/org.mozilla.updater
 endif
 	printf APPLMOZB > $(dist_dest)/Contents/PkgInfo
 endif
 
 .PHONY: features
 tools features::
-	$(PYTHON) -c 'import os, json; listing = {"system": os.listdir("$(DIST)/bin/browser/features")}; print json.dumps(listing)' > $(DIST)/bin/browser/chrome/browser/content/browser/built_in_addons.json
+	$(PYTHON) -c 'import os, json; listing = {"system": sorted(os.listdir("$(DIST)/bin/browser/features"))}; print json.dumps(listing)' > $(DIST)/bin/browser/chrome/browser/content/browser/built_in_addons.json