diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/extensions/test/xpinstall/browser_whitelist5.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/extensions/test/xpinstall/browser_whitelist5.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+// ----------------------------------------------------------------------------
+// Tests installing an unsigned add-on through a startSoftwareUpdate call in web
+// content. This should be blocked by the whitelist check.
+// This verifies bug 252830
+function test() {
+  Harness.installBlockedCallback = allow_blocked;
+  Harness.installsCompletedCallback = finish_test;
+  Harness.setup();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.loadURI(TESTROOT + "startsoftwareupdate.html? " + encodeURIComponent(TESTROOT + "unsigned.xpi"));
+}
+
+function allow_blocked(installInfo) {
+  is(installInfo.originatingWindow, gBrowser.contentWindow, "Install should have been triggered by the right window");
+  is(installInfo.originatingURI.spec, gBrowser.currentURI.spec, "Install should have been triggered by the right uri");
+  return false;
+}
+
+function finish_test(count) {
+  is(count, 0, "No add-ons should have been installed");
+  gBrowser.removeCurrentTab();
+  Harness.finish();
+}
+// ----------------------------------------------------------------------------