The Tor Browser / file revision

 function test() {

   var tab = gBrowser.addTab(null, {skipAnimation: true});

   gBrowser.selectedTab = tab;

   var gotTabAttrModified = false;

   var gotTabClose = false;

   function onTabClose() {

     gotTabClose = true;

     tab.addEventListener("TabAttrModified", onTabAttrModified, false);

   }

   function onTabAttrModified() {

     gotTabAttrModified = true;

   }

   tab.addEventListener("TabClose", onTabClose, false);

   gBrowser.removeTab(tab);

   ok(gotTabClose, "should have got the TabClose event");

   ok(!gotTabAttrModified, "shouldn't have got the TabAttrModified event after TabClose");

   tab.removeEventListener("TabClose", onTabClose, false);

   tab.removeEventListener("TabAttrModified", onTabAttrModified, false);

 }