diff -r 000000000000 -r 6474c204b198 extensions/cookie/test/browser_test_favicon.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/extensions/cookie/test/browser_test_favicon.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+// tests third party cookie blocking using a favicon load directly from chrome.
+// in this case, the docshell of the channel is chrome, not content; thus
+// the cookie should be considered third party.
+
+function test() {
+  waitForExplicitFinish();
+
+  Services.prefs.setIntPref("network.cookie.cookieBehavior", 1);
+
+  Services.obs.addObserver(function (theSubject, theTopic, theData) {
+    var uri = theSubject.QueryInterface(Components.interfaces.nsIURI);
+    var domain = uri.host;
+
+    if (domain == "example.org") {
+      ok(true, "foreign favicon cookie was blocked");
+
+      Services.prefs.setIntPref("network.cookie.cookieBehavior", 0);
+
+      Services.obs.removeObserver(arguments.callee, "cookie-rejected");
+
+      finish();
+    }
+  }, "cookie-rejected", false);
+
+  // kick off a favicon load
+  gBrowser.setIcon(gBrowser.selectedTab, "http://example.org/tests/extensions/cookie/test/damonbowling.jpg");
+}