diff -r 000000000000 -r 6474c204b198 js/xpconnect/idl/xpcIJSGetFactory.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/xpconnect/idl/xpcIJSGetFactory.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIFactory;
+
+/**
+ * Every JS module exports a single NSGetFactory symbol which is converted into this
+ * functional interface type.
+ */
+[scriptable, function, uuid(3FE0C205-D75B-4CAC-9347-D2B855050143)]
+interface xpcIJSGetFactory : nsISupports
+{
+  nsIFactory get(in nsCIDRef aCID);
+};