The Tor Browser / file revision

 function test()

 {

   waitForExplicitFinish();

   test1();

 }

 /**

  * 1. load about:addons in a new tab and select that tab

  * 2. insert a button with tooltiptext

  * 3. create a new blank tab and select that tab

  * 4. select the about:addons tab and hover the inserted button

  * 5. remove the about:addons tab

  * 6. remove the blank tab

  *

  * the test succeeds if it doesn't trigger any assertions

  */

 function test1() {

   let uri = "about:addons";

   let tab = gBrowser.addTab();

   tab.linkedBrowser.addEventListener("load", function(aEvent) {

     tab.linkedBrowser.removeEventListener("load", arguments.callee, true);

     let doc = gBrowser.contentDocument;

     var e = doc.createElement("button");

     e.setAttribute('label', "hello");

     e.setAttribute('tooltiptext', "world");

     doc.documentElement.insertBefore(e, doc.documentElement.firstChild);

     let tab2 = gBrowser.addTab();

     gBrowser.selectedTab = tab2;

     setTimeout(function() {

       gBrowser.selectedTab = tab;

       let doc = gBrowser.contentDocument;

       var win = gBrowser.contentWindow;

       EventUtils.disableNonTestMouseEvents(true);

       try {

         EventUtils.synthesizeMouse(e, 1, 1, { type: "mouseover" }, win);

         EventUtils.synthesizeMouse(e, 2, 6, { type: "mousemove" }, win);

         EventUtils.synthesizeMouse(e, 2, 4, { type: "mousemove" }, win);

       } finally {

         EventUtils.disableNonTestMouseEvents(false);

       }

       executeSoon(function() {

         gBrowser.removeTab(tab, {animate: false});

         gBrowser.removeTab(tab2, {animate: false});

         ok(true, "pass if no assertions");

         // done

         executeSoon(finish);

       });

     }, 0);

   }, true);

   gBrowser.selectedTab = tab;

   gBrowser.selectedTab.linkedBrowser.loadURI(uri);

 }