diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug706736.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug706736.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  newWindowWithTabView(function(win) {
+    registerCleanupFunction(function() {
+      win.close();
+    });
+
+    let cw = win.TabView.getContentWindow();
+
+    let groupItemOne = cw.GroupItems.groupItems[0];
+    is(groupItemOne.getChildren().length, 1, "Group one has 1 tab item");
+
+    let groupItemTwo = createGroupItemWithBlankTabs(win, 300, 300, 40, 1);
+    is(groupItemTwo.getChildren().length, 1, "Group two has 1 tab items");
+
+    whenTabViewIsHidden(function() {
+      win.gBrowser.removeTab(win.gBrowser.selectedTab);
+      executeSoon(function() {
+        win.undoCloseTab();
+
+        groupItemTwo.addSubscriber("childAdded", function onChildAdded(data) {
+          groupItemTwo.removeSubscriber("childAdded", onChildAdded);
+
+          is(groupItemOne.getChildren().length, 1, "Group one still has 1 tab item");
+          is(groupItemTwo.getChildren().length, 1, "Group two still has 1 tab item");
+        });
+
+        finish();
+      });
+    }, win);
+    groupItemTwo.getChild(0).zoomIn();
+  }, function(win) {
+    let newTab = win.gBrowser.addTab();
+    win.gBrowser.pinTab(newTab);
+  });
+}