diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug626368.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug626368.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  let cw;
+
+  let createGroupItem = function () {
+    let bounds = new cw.Rect(20, 20, 150, 150);
+    let groupItem = new cw.GroupItem([], {bounds: bounds, immediately: true});
+
+    cw.UI.setActive(groupItem);
+    gBrowser.loadOneTab('about:blank', {inBackground: true});
+
+    return groupItem;
+  }
+
+  let synthesizeMiddleMouseDrag = function (tabContainer, width) {
+    EventUtils.synthesizeMouseAtCenter(tabContainer,
+        {type: 'mousedown', button: 1}, cw);
+    let rect = tabContainer.getBoundingClientRect();
+    EventUtils.synthesizeMouse(tabContainer, rect.width / 2 + width,
+        rect.height / 2, {type: 'mousemove', button: 1}, cw);
+    EventUtils.synthesizeMouse(tabContainer, rect.width / 2 + width,
+        rect.height / 2, {type: 'mouseup', button: 1}, cw);
+  }
+
+  let testDragAndDropWithMiddleMouseButton = function () {
+    let groupItem = createGroupItem();
+    let tabItem = groupItem.getChild(0);
+    let tabContainer = tabItem.container;
+    let bounds = tabItem.getBounds();
+
+    // try to drag and move the mouse out of the tab
+    synthesizeMiddleMouseDrag(tabContainer, 200);
+    is(groupItem.getChild(0), tabItem, 'tabItem was not closed');
+    ok(bounds.equals(tabItem.getBounds()), 'bounds did not change');
+
+    // try to drag and let the mouse stay within tab bounds
+    synthesizeMiddleMouseDrag(tabContainer, 10);
+    ok(!groupItem.getChild(0), 'tabItem was closed');
+
+    hideTabView(finish);
+  }
+
+  waitForExplicitFinish();
+
+  showTabView(function () {
+    cw = TabView.getContentWindow();
+    afterAllTabsLoaded(testDragAndDropWithMiddleMouseButton);
+  });
+}