diff -r 000000000000 -r 6474c204b198 toolkit/components/places/tests/browser/browser_favicon_privatebrowsing_perwindowpb.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/places/tests/browser/browser_favicon_privatebrowsing_perwindowpb.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function test() {
+  waitForExplicitFinish();
+
+  const pageURI =
+   "http://example.org/tests/toolkit/components/places/tests/browser/favicon.html";
+  let windowsToClose = [];
+
+  registerCleanupFunction(function() {
+    windowsToClose.forEach(function(aWin) {
+      aWin.close();
+    });
+  });
+
+  function testOnWindow(aIsPrivate, aCallback) {
+    whenNewWindowLoaded({private: aIsPrivate}, function(aWin) {
+      windowsToClose.push(aWin);
+      executeSoon(function() aCallback(aWin));
+    });
+  };
+
+  function waitForTabLoad(aWin, aCallback) {
+    aWin.gBrowser.selectedBrowser.addEventListener("load", function onLoad() {
+      aWin.gBrowser.selectedBrowser.removeEventListener("load", onLoad, true);
+      aCallback();
+    }, true);
+    aWin.gBrowser.selectedBrowser.loadURI(pageURI);
+  }
+
+  testOnWindow(true, function(win) {
+    waitForTabLoad(win, function() {
+      PlacesUtils.favicons.getFaviconURLForPage(NetUtil.newURI(pageURI),
+        function(uri, dataLen, data, mimeType) {
+          is(uri, null, "No result should be found");
+          finish();
+        }
+      );
+    });
+  });
+}