diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/extensions/test/xpinstall/browser_navigateaway2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/extensions/test/xpinstall/browser_navigateaway2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+// ----------------------------------------------------------------------------
+// Tests that closing the initiating page during the install doesn't break the
+// install.
+// This verifies bugs 473060 and 475347
+function test() {
+  Harness.downloadProgressCallback = download_progress;
+  Harness.installEndedCallback = install_ended;
+  Harness.installsCompletedCallback = finish_test;
+  Harness.setup();
+
+  var pm = Services.perms;
+  pm.add(makeURI("http://example.com/"), "install", pm.ALLOW_ACTION);
+
+  var triggers = encodeURIComponent(JSON.stringify({
+    "Unsigned XPI": TESTROOT + "unsigned.xpi"
+  }));
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.loadURI(TESTROOT + "installtrigger.html?" + triggers);
+}
+
+function download_progress(addon, value, maxValue) {
+  gBrowser.removeCurrentTab();
+}
+
+function install_ended(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");
+
+  Harness.finish();
+}