diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug607108.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug607108.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,81 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  let cw;
+
+  let assertNumberOfGroupItems = function (num) {
+    let groupItems = cw.GroupItems.groupItems;
+    is(groupItems.length, num, "number of groupItems is " + num);
+  };
+
+  let dragTabOutOfGroup = function (groupItem) {
+    let tabItem = groupItem.getChild(0);
+    let target = tabItem.container;
+
+    EventUtils.synthesizeMouseAtCenter(target, {type: "mousedown"}, cw);
+    EventUtils.synthesizeMouse(target, 400, 100, {type: "mousemove"}, cw);
+    EventUtils.synthesizeMouseAtCenter(target, {type: "mouseup"}, cw);
+  };
+
+  let testCreateGroup = function (callback) {
+    let content = cw.document.getElementById("content");
+
+    // drag to create a new group
+    EventUtils.synthesizeMouse(content, 400, 50, {type: "mousedown"}, cw);
+    EventUtils.synthesizeMouse(content, 500, 250, {type: "mousemove"}, cw);
+    EventUtils.synthesizeMouse(content, 500, 250, {type: "mouseup"}, cw);
+
+    assertNumberOfGroupItems(2);
+
+    // enter a title for the new group
+    EventUtils.synthesizeKey("t", {}, cw);
+    EventUtils.synthesizeKey("VK_RETURN", {}, cw);
+
+
+    let groupItem = cw.GroupItems.groupItems[1];
+    is(groupItem.getTitle(), "t", "new groupItem's title is correct");
+
+    closeGroupItem(groupItem, callback);
+  };
+
+  let testDragOutOfGroup = function (callback) {
+    assertNumberOfGroupItems(1);
+
+    let groupItem = cw.GroupItems.groupItems[0];
+    dragTabOutOfGroup(groupItem);
+    assertNumberOfGroupItems(2);
+
+    // enter a title for the new group
+    EventUtils.synthesizeKey("t", {}, cw);
+    EventUtils.synthesizeKey("VK_RETURN", {}, cw);
+
+    groupItem = cw.GroupItems.groupItems[1];
+    is(groupItem.getTitle(), "t", "new groupItem's title is correct");
+    closeGroupItem(groupItem, callback);
+  };
+
+  let onLoad = function (win) {
+    registerCleanupFunction(function () win.close());
+
+    for (let i = 0; i < 2; i++)
+      win.gBrowser.addTab();
+  };
+
+  let onShow = function (win) {
+    cw = win.TabView.getContentWindow();
+    assertNumberOfGroupItems(1);
+
+    let groupItem = cw.GroupItems.groupItems[0];
+    groupItem.setSize(200, 600, true);
+
+    waitForFocus(function () {
+      testCreateGroup(function () {
+        testDragOutOfGroup(finish);
+      });
+    }, cw);
+  };
+
+  waitForExplicitFinish();
+  newWindowWithTabView(onShow, onLoad);
+}