diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug733115.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug733115.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,41 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  showTabView(function() {
+    registerCleanupFunction(function() {
+      if (gBrowser.tabs[1])
+        gBrowser.removeTab(gBrowser.tabs[1]);
+      TabView.hide();
+    });
+
+    let contentWindow = TabView.getContentWindow();
+    let groupItem = createEmptyGroupItem(contentWindow, 200, 200, 20);
+    contentWindow.GroupItems.setActiveGroupItem(groupItem);
+
+    // A new tab should be added to the active group and tabview should zoom into it.
+    is(groupItem.getChildren().length, 0, "This group doesn't have any tabitems");
+    whenTabViewIsHidden(function() {
+      is(groupItem.getChildren().length, 1, "This group has one tabitem");
+
+      showTabView(function() {
+        // Ensure that no new tab is added to this non-empty tab group.
+        whenTabViewIsHidden(function() {
+          let tabItems = groupItem.getChildren();
+          is(tabItems.length, 1, "This group has one tabitem");
+          is(tabItems[0].tab, gBrowser.selectedTab, "The same tab");
+
+          tabItems[0].close();
+          groupItem.close();
+
+          finish();
+        });
+        EventUtils.synthesizeKey("VK_RETURN", {}, contentWindow);
+      });
+    });
+    EventUtils.synthesizeKey("VK_RETURN", {}, contentWindow);
+  });
+}
+