diff -r 000000000000 -r 6474c204b198 dom/interfaces/sidebar/nsIWebContentHandlerRegistrar.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/sidebar/nsIWebContentHandlerRegistrar.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; 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 "nsISupports.idl"
+
+interface nsIDOMWindow;
+
+/**
+ * nsIWebContentHandlerRegistrar
+ * 
+ * Applications wishing to use web content handlers need to implement this
+ * interface. Typically they will prompt the user to confirm adding an entry
+ * to the local list. 
+ *
+ * The component must have the contract id defined below so that nsNavigator
+ * can invoke it. 
+ */
+
+[scriptable, uuid(e6a75410-c93e-42bf-84ca-a5c3ec34a2f1)]
+interface nsIWebContentHandlerRegistrar : nsISupports
+{
+  /**
+   * See documentation in Navigator.webidl
+   * The additional contentWindow param for both methods represents the dom
+   * content window from which the method has been called.
+   */
+   void registerContentHandler(in DOMString mimeType,
+                               in DOMString uri,
+                               in DOMString title,
+                               in nsIDOMWindow contentWindow);
+   void registerProtocolHandler(in DOMString protocol,
+                                in DOMString uri,
+                                in DOMString title,
+                                in nsIDOMWindow contentWindow);
+};
+
+%{ C++
+
+#define NS_WEBCONTENTHANDLERREGISTRAR_CONTRACTID "@mozilla.org/embeddor.implemented/web-content-handler-registrar;1"
+%}