The Tor Browser / file revision

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 // Bug 587922: tabs don't get removed if they're hidden

 function test() {

   waitForExplicitFinish();

   // Add a tab that will get removed and hidden

   let testTab = gBrowser.addTab("about:blank", {skipAnimation: true});

   is(gBrowser.visibleTabs.length, 2, "just added a tab, so 2 tabs");

   gBrowser.selectedTab = testTab;

   let numVisBeforeHide, numVisAfterHide;

   gBrowser.tabContainer.addEventListener("TabSelect", function() {

     gBrowser.tabContainer.removeEventListener("TabSelect", arguments.callee, false);

     // While the next tab is being selected, hide the removing tab

     numVisBeforeHide = gBrowser.visibleTabs.length;

     gBrowser.hideTab(testTab);

     numVisAfterHide = gBrowser.visibleTabs.length;

   }, false);

   gBrowser.removeTab(testTab, {animate: true});

   // Make sure the tab gets removed at the end of the animation by polling

   (function checkRemoved() setTimeout(function() {

     if (gBrowser.tabs.length != 1)

       return checkRemoved();

     is(numVisBeforeHide, 1, "animated remove has in 1 tab left");

     is(numVisAfterHide, 1, "hiding a removing tab is also has 1 tab");

     finish();

   }, 50))();

 }