diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_about_protocol.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_about_protocol.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* 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/. */
+
+let Ci = Components.interfaces;
+let Cc = Components.classes;
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+
+let unsafeAboutModule = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAboutModule]),
+  newChannel: function (aURI) {
+    let chan = Services.io.newChannel("about:blank", null, null);
+    chan.owner = Services.scriptSecurityManager.getSystemPrincipal();
+    return chan;
+  },
+  getURIFlags: function (aURI) {
+    return Ci.nsIAboutModule.URI_SAFE_FOR_UNTRUSTED_CONTENT;
+  }
+};
+
+let factory = {
+  createInstance: function(aOuter, aIID) {
+    if (aOuter)
+      throw Components.results.NS_ERROR_NO_AGGREGATION;
+    return unsafeAboutModule.QueryInterface(aIID);
+  },
+  lockFactory: function(aLock) {
+    throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
+  },
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIFactory])
+};
+
+function run_test() {
+  let registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
+  let classID = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator).generateUUID();
+  registrar.registerFactory(classID, "", "@mozilla.org/network/protocol/about;1?what=unsafe", factory);
+
+  let aboutUnsafeURI = Services.io.newURI("about:unsafe", null, null);
+  let aboutUnsafeChan = Services.io.newChannelFromURI(aboutUnsafeURI);
+  do_check_null(aboutUnsafeChan.owner, "URI_SAFE_FOR_UNTRUSTED_CONTENT channel has no owner");
+
+  registrar.unregisterFactory(classID, factory);
+}