diff -r 000000000000 -r 6474c204b198 browser/base/content/test/newtab/browser_newtab_tabsync.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/newtab/browser_newtab_tabsync.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * These tests make sure that all changes that are made to a specific
+ * 'New Tab Page' are synchronized with all other open 'New Tab Pages'
+ * automatically. All about:newtab pages should always be in the same
+ * state.
+ */
+function runTests() {
+  // Disabled until bug 716543 is fixed.
+  return;
+
+  yield setLinks("0,1,2,3,4,5,6,7,8,9");
+  setPinnedLinks(",1");
+
+  yield addNewTabPageTab();
+  checkGrid("0,1p,2,3,4,5,6,7,8");
+
+  let resetButton = getContentDocument().getElementById("toolbar-button-reset");
+  ok(!resetButton.hasAttribute("modified"), "page is not modified");
+
+  let oldSites = getGrid().sites;
+  let oldResetButton = resetButton;
+
+  // create the new tab page
+  yield addNewTabPageTab();
+  checkGrid("0,1p,2,3,4,5,6,7,8");
+
+  resetButton = getContentDocument().getElementById("toolbar-button-reset");
+  ok(!resetButton.hasAttribute("modified"), "page is not modified");
+
+  // unpin a cell
+  yield unpinCell(1);
+  checkGrid("0,1,2,3,4,5,6,7,8");
+  checkGrid("0,1,2,3,4,5,6,7,8", oldSites);
+
+  // remove a cell
+  yield blockCell(1);
+  checkGrid("0,2,3,4,5,6,7,8,9");
+  checkGrid("0,2,3,4,5,6,7,8,9", oldSites);
+  ok(resetButton.hasAttribute("modified"), "page is modified");
+  ok(oldResetButton.hasAttribute("modified"), "page is modified");
+
+  // insert a new cell by dragging
+  yield simulateExternalDrop(1);
+  checkGrid("0,99p,2,3,4,5,6,7,8");
+  checkGrid("0,99p,2,3,4,5,6,7,8", oldSites);
+
+  // drag a cell around
+  yield simulateDrop(2, 1);
+  checkGrid("0,2p,99p,3,4,5,6,7,8");
+  checkGrid("0,2p,99p,3,4,5,6,7,8", oldSites);
+
+  // reset the new tab page
+  yield getContentWindow().gToolbar.reset(TestRunner.next);
+  checkGrid("0,1,2,3,4,5,6,7,8");
+  checkGrid("0,1,2,3,4,5,6,7,8", oldSites);
+  ok(!resetButton.hasAttribute("modified"), "page is not modified");
+  ok(!oldResetButton.hasAttribute("modified"), "page is not modified");
+}