diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/extensions/test/xpinstall/browser_localfile.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/extensions/test/xpinstall/browser_localfile.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+// ----------------------------------------------------------------------------
+// Tests installing an local file works when loading the url
+function test() {
+  Harness.installEndedCallback = install_ended;
+  Harness.installsCompletedCallback = finish_test;
+  Harness.setup();
+
+  var cr = Components.classes["@mozilla.org/chrome/chrome-registry;1"]
+                     .getService(Components.interfaces.nsIChromeRegistry);
+
+  var chromeroot = extractChromeRoot(gTestPath);
+  try {
+    var xpipath = cr.convertChromeURL(makeURI(chromeroot + "unsigned.xpi")).spec;
+  } catch (ex) {
+    var xpipath = chromeroot + "unsigned.xpi"; //scenario where we are running from a .jar and already extracted
+  }
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.loadURI(xpipath);
+}
+
+function install_ended(install, addon) {
+  install.cancel();
+}
+
+function finish_test(count) {
+  is(count, 1, "1 Add-on should have been successfully installed");
+
+  gBrowser.removeCurrentTab();
+  Harness.finish();
+}
+// ----------------------------------------------------------------------------