diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/extensions/test/xpinstall/browser_bug540558.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/extensions/test/xpinstall/browser_bug540558.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+// ----------------------------------------------------------------------------
+// Tests that calling InstallTrigger.installChrome works
+function test() {
+  Harness.installEndedCallback = check_xpi_install;
+  Harness.installsCompletedCallback = finish_test;
+  Harness.setup();
+
+  var pm = Services.perms;
+  pm.add(makeURI("http://example.com/"), "install", pm.ALLOW_ACTION);
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.loadURI(TESTROOT + "bug540558.html");
+}
+
+function check_xpi_install(install, addon) {
+  install.cancel();
+}
+
+function finish_test(count) {
+  is(count, 1, "1 Add-on should have been successfully installed");
+  Services.perms.remove("example.com", "install");
+
+  gBrowser.removeCurrentTab();
+  Harness.finish();
+}