diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug587231.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug587231.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,96 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let activeTab;
+let testTab;
+let testGroup;
+let contentWindow;
+
+function test() {
+  waitForExplicitFinish();
+
+  // create new tab
+  testTab = gBrowser.addTab("about:blank");
+
+  window.addEventListener("tabviewshown", onTabViewWindowLoaded, false);
+  TabView.toggle();
+}
+
+function onTabViewWindowLoaded() {
+  window.removeEventListener("tabviewshown", onTabViewWindowLoaded, false);
+  ok(TabView.isVisible(), "Tab View is visible");
+
+  contentWindow = document.getElementById("tab-view").contentWindow;
+
+  // create group
+  let testGroupRect = new contentWindow.Rect(20, 20, 300, 300);
+  testGroup = new contentWindow.GroupItem([], { bounds: testGroupRect });
+  ok(testGroup.isEmpty(), "This group is empty");
+  
+  ok(testTab._tabViewTabItem, "tab item exists");
+
+  // place tab in group
+  let testTabItem = testTab._tabViewTabItem;
+
+  if (testTabItem.parent)
+    testTabItem.parent.remove(testTabItem);
+  testGroup.add(testTabItem);
+
+  ok(testTab._tabViewTabItem, "tab item exists after adding to group");
+
+  // record last update time of tab canvas
+  let initialUpdateTime = testTabItem._lastTabUpdateTime;
+
+  // simulate resize
+  let resizer = contentWindow.iQ('.iq-resizable-handle', testGroup.container)[0];
+  let offsetX = 100;
+  let offsetY = 100;
+  let delay = 500;
+
+  let funcChain = new Array();
+  funcChain.push(function() {
+    EventUtils.synthesizeMouse(
+      resizer, 1, 1, { type: "mousedown" }, contentWindow);
+    setTimeout(funcChain.shift(), delay);
+  });
+  // drag
+  for (let i = 4; i >= 0; i--) {
+    funcChain.push(function() {
+      EventUtils.synthesizeMouse(
+        resizer,  Math.round(offsetX/4),  Math.round(offsetY/4),
+        { type: "mousemove" }, contentWindow);
+      setTimeout(funcChain.shift(), delay);
+    });
+  }
+  funcChain.push(function() {
+    EventUtils.synthesizeMouse(resizer, 0, 0, { type: "mouseup" }, 
+      contentWindow);    
+    setTimeout(funcChain.shift(), delay);
+  });
+  funcChain.push(function() {
+    // verify that update time has changed after last update
+    let lastTime = testTabItem._lastTabUpdateTime;
+    let hbTiming = contentWindow.TabItems._heartbeatTiming;
+    ok((lastTime - initialUpdateTime) > hbTiming, "Tab has been updated:"+lastTime+"-"+initialUpdateTime+">"+hbTiming);
+
+    // clean up
+    testGroup.remove(testTab._tabViewTabItem);
+    testTab._tabViewTabItem.close();
+    testGroup.close();
+
+    let currentTabs = contentWindow.TabItems.getItems();
+    ok(currentTabs[0], "A tab item exists to make active");
+    contentWindow.UI.setActive(currentTabs[0]);
+    
+    window.addEventListener("tabviewhidden", finishTest, false);
+    TabView.toggle();
+  });
+  setTimeout(funcChain.shift(), delay);
+}
+
+function finishTest() {
+  window.removeEventListener("tabviewhidden", finishTest, false);
+  ok(!TabView.isVisible(), "Tab View is not visible");
+
+  finish();  
+}