The Tor Browser / file revision

 /* 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 groupItem = cw.GroupItems.groupItems[0];

     groupItem.setBounds(new cw.Rect(cw.innerWidth - 200, 0, 200, 200));

     whenTabViewIsHidden(function () waitForFocus(finish), win);

     waitForFocus(function () {

       let button = cw.document.getElementById("exit-button");

       EventUtils.synthesizeMouseAtCenter(button, {}, cw);

     }, cw);

   });

 }