diff -r 000000000000 -r 6474c204b198 browser/base/content/test/newtab/browser_newtab_bug876313.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/newtab/browser_newtab_bug876313.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * This test makes sure that the changes made by unpinning
+ * a site are actually written to NewTabUtils' storage.
+ */
+function runTests() {
+  // Second cell is pinned with page #99.
+  yield setLinks("0,1,2,3,4,5,6,7,8");
+  setPinnedLinks(",99");
+
+  yield addNewTabPageTab();
+  checkGrid("0,99p,1,2,3,4,5,6,7");
+
+  // Unpin the second cell's site.
+  yield unpinCell(1);
+  checkGrid("0,1,2,3,4,5,6,7,8");
+
+  // Clear the pinned cache to force NewTabUtils to read the pref again.
+  NewTabUtils.pinnedLinks.resetCache();
+  NewTabUtils.allPages.update();
+  checkGrid("0,1,2,3,4,5,6,7,8");
+}