diff -r 000000000000 -r 6474c204b198 netwerk/protocol/res/nsIResProtocolHandler.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/protocol/res/nsIResProtocolHandler.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsIProtocolHandler.idl"
+
+/**
+ * Protocol handler interface for the resource:// protocol
+ */
+[scriptable, uuid(067ca872-e947-4bd6-8946-a479cb6ba5dd)]
+interface nsIResProtocolHandler : nsIProtocolHandler
+{
+    /**
+     * Sets the substitution for the root key:
+     *   resource://root/path ==> baseURI.resolve(path)
+     *
+     * A null baseURI removes the specified substitution.
+     *
+     * A root key should always be lowercase; however, this may not be
+     * enforced.
+     */
+    void setSubstitution(in ACString root, in nsIURI baseURI);
+
+    /**
+     * Gets the substitution for the root key.
+     *
+     * @throws NS_ERROR_NOT_AVAILABLE if none exists.
+     */
+    nsIURI getSubstitution(in ACString root);
+
+    /**
+     * Returns TRUE if the substitution exists and FALSE otherwise.
+     */
+    boolean hasSubstitution(in ACString root);
+
+    /**
+     * Utility function to resolve a resource URI.  A resolved URI is not 
+     * guaranteed to reference a resource that exists (ie. opening a channel to
+     * the resolved URI may fail).
+     *
+     * @throws NS_ERROR_NOT_AVAILABLE if resURI.host() is an unknown root key.
+     */
+    AUTF8String resolveURI(in nsIURI resURI);
+};