diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug640765.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug640765.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,75 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let contentWindow;
+let groupItem;
+
+function test() {
+  waitForExplicitFinish();
+
+  let newTabOne = gBrowser.addTab();
+  let newTabTwo = gBrowser.addTab();
+  let newTabThree = gBrowser.addTab();
+
+  registerCleanupFunction(function() {
+    TabView.hide();
+    while (gBrowser.tabs.length > 1)
+      gBrowser.removeTab(gBrowser.tabs[0]);
+  });
+
+  showTabView(function() {
+    contentWindow = document.getElementById("tab-view").contentWindow;
+    is(contentWindow.GroupItems.groupItems.length, 1, "Has only one group");
+
+    groupItem = contentWindow.GroupItems.groupItems[0];
+
+    whenAppTabIconAdded(groupItem, function () {
+      whenAppTabIconAdded(groupItem, function () {
+        whenAppTabIconAdded(groupItem, function () {
+
+          is(xulTabForAppTabIcon(0), newTabOne,
+            "New tab one matches the first app tab icon in tabview");
+          is(xulTabForAppTabIcon(1), newTabTwo,
+            "New tab two matches the second app tab icon in tabview");
+          is(xulTabForAppTabIcon(2), newTabThree,
+            "New tab three matches the third app tab icon in tabview");
+
+          // move the last tab to the first position
+          gBrowser.moveTabTo(newTabThree, 0);
+          is(xulTabForAppTabIcon(0), newTabThree,
+            "New tab three matches the first app tab icon in tabview");
+          is(xulTabForAppTabIcon(1), newTabOne,
+            "New tab one matches the second app tab icon in tabview");
+          is(xulTabForAppTabIcon(2), newTabTwo,
+            "New tab two matches the third app tab icon in tabview");
+
+          // move the first tab to the second position
+          gBrowser.moveTabTo(newTabThree, 1);
+          is(xulTabForAppTabIcon(0), newTabOne,
+            "New tab one matches the first app tab icon in tabview");
+          is(xulTabForAppTabIcon(1), newTabThree,
+            "New tab three matches the second app tab icon in tabview");
+          is(xulTabForAppTabIcon(2), newTabTwo,
+            "New tab two matches the third app tab icon in tabview");
+
+          hideTabView(function() {
+            gBrowser.removeTab(newTabOne);
+            gBrowser.removeTab(newTabTwo);
+            gBrowser.removeTab(newTabThree);
+            finish();
+          });
+        });
+        gBrowser.pinTab(newTabThree);
+      });
+      gBrowser.pinTab(newTabTwo);
+    });
+    gBrowser.pinTab(newTabOne);
+  });
+}
+
+function xulTabForAppTabIcon(index) {
+    return contentWindow.iQ(
+             contentWindow.iQ(".appTabIcon", 
+                              groupItem.$appTabTray)[index]).data("xulTab");
+}
+