diff -r 000000000000 -r 6474c204b198 browser/metro/components/AboutRedirector.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/metro/components/AboutRedirector.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,92 @@
+ // -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
+/* 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/. */
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+
+let modules = {
+  newtab: {
+    uri: "chrome://browser/content/Start.xul",
+    privileged: true
+  },
+  // about:blank has some bad loading behavior we can avoid, if we use an alias
+  empty: {
+    uri: "about:blank",
+    privileged: false
+  },
+  firstrun: {
+    uri: "chrome://browser/content/firstrun/firstrun.xhtml",
+    privileged: true
+  },
+  rights: {
+#ifdef MOZ_OFFICIAL_BRANDING
+    uri: "chrome://browser/content/aboutRights.xhtml",
+#else
+    uri: "chrome://global/content/aboutRights-unbranded.xhtml",
+#endif
+    privileged: false
+  },
+  blocked: {
+    uri: "chrome://browser/content/blockedSite.xhtml",
+    privileged: true
+  },
+  certerror: {
+    uri: "chrome://browser/content/aboutCertError.xhtml",
+    privileged: true
+  },
+  start: {
+    uri: "about:newtab",
+    privileged: true
+  },
+  home: {
+    uri: "about:newtab",
+    privileged: true
+  },
+#ifdef MOZ_CRASHREPORTER
+  crashprompt: {
+    uri: "chrome://browser/content/crashprompt.xhtml",
+    privileged: true
+  },
+#endif
+}
+
+function AboutGeneric() {}
+
+AboutGeneric.prototype = {
+  classID: Components.ID("{433d2d75-5923-49b0-854d-f37267b03dc7}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAboutModule]),
+
+  _getModuleInfo: function (aURI) {
+    let moduleName = aURI.path.replace(/[?#].*/, "").toLowerCase();
+    return modules[moduleName];
+  },
+
+  getURIFlags: function(aURI) {
+    return Ci.nsIAboutModule.ALLOW_SCRIPT;
+  },
+
+  newChannel: function(aURI) {
+    let moduleInfo = this._getModuleInfo(aURI);
+
+    var ios = Cc["@mozilla.org/network/io-service;1"].
+              getService(Ci.nsIIOService);
+
+    var channel = ios.newChannel(moduleInfo.uri, null, null);
+
+    if (!moduleInfo.privileged) {
+      // Setting the owner to null means that we'll go through the normal
+      // path in GetChannelPrincipal and create a codebase principal based
+      // on the channel's originalURI
+      channel.owner = null;
+    }
+
+    channel.originalURI = aURI;
+    return channel;
+  }
+};
+
+const components = [AboutGeneric];
+const NSGetFactory = XPCOMUtils.generateNSGetFactory(components);