diff -r 000000000000 -r 6474c204b198 uriloader/exthandler/nsIExternalURLHandlerService.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uriloader/exthandler/nsIExternalURLHandlerService.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* 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 "nsIMIMEInfo.idl"
+
+/**
+ * The external URL handler service is used for finding
+ * platform-specific applications for handling particular URLs.
+ */
+
+[scriptable, uuid(56c5c7d3-6fd3-43f8-9429-4397e111453a)]
+interface nsIExternalURLHandlerService : nsISupports
+{
+  /**
+   * Given a URL, looks up the handler info from the OS. This should be
+   * overridden by each OS's implementation.
+   *
+   * @param aURL The URL we are looking for.
+   * @param aFound  Was an OS default handler for this URL found?
+   * @return  An nsIHanderInfo for the protocol.
+   */
+  nsIHandlerInfo getURLHandlerInfoFromOS(in nsIURI aURL,
+                                         out boolean aFound);
+
+};