diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug597360.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug597360.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* 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 groupItems = cw.GroupItems.groupItems;
+    let groupItem = groupItems[0];
+
+    is(groupItems.length, 1, "There is one group item on startup");
+
+    whenTabViewIsHidden(function () {
+      is(groupItems.length, 1, "There is still one group item");
+      isnot(groupItem.id, groupItems[0].id, 
+            "The initial group item is not the same as the final group item");
+      is(win.gBrowser.tabs.length, 1, "There is only one tab");
+
+      finish();
+    }, win);
+
+    hideGroupItem(groupItem, function () {
+      // create a new tab
+      EventUtils.synthesizeKey("t", { accelKey: true }, cw);
+    });
+  });
+}