diff -r 000000000000 -r 6474c204b198 b2g/components/MailtoProtocolHandler.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/b2g/components/MailtoProtocolHandler.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* 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/. */
+
+"use strict";
+
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+Cu.import('resource://gre/modules/XPCOMUtils.jsm');
+
+XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
+                                   "@mozilla.org/childprocessmessagemanager;1",
+                                   "nsIMessageSender");
+
+function MailtoProtocolHandler() {
+}
+
+MailtoProtocolHandler.prototype = {
+
+  scheme: "mailto",
+  defaultPort: -1,
+  protocolFlags: Ci.nsIProtocolHandler.URI_NORELATIVE |
+                 Ci.nsIProtocolHandler.URI_NOAUTH |
+                 Ci.nsIProtocolHandler.URI_LOADABLE_BY_ANYONE |
+                 Ci.nsIProtocolHandler.URI_DOES_NOT_RETURN_DATA,
+  allowPort: function() false,
+
+  newURI: function Proto_newURI(aSpec, aOriginCharset) {
+    let uri = Cc["@mozilla.org/network/simple-uri;1"].createInstance(Ci.nsIURI);
+    uri.spec = aSpec;
+    return uri;
+  },
+
+  newChannel: function Proto_newChannel(aURI) {
+    cpmm.sendAsyncMessage("mail-handler", {
+      URI: aURI.spec,
+      type: "mail" });
+
+    throw Components.results.NS_ERROR_ILLEGAL_VALUE;
+  },
+
+  classID: Components.ID("{50777e53-0331-4366-a191-900999be386c}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIProtocolHandler])
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([MailtoProtocolHandler]);