Bug 624952 - Firefox 4.0 often shows all tab groups' tabs on startup [r=ian, a=dolske]

browser/base/content/tabview/ui.js

@@ -200,11 +200,6 @@ let UI = {
         }
       });
 
-      iQ(window).bind("beforeunload", function() {
-        Array.forEach(gBrowser.tabs, function(tab) {
-          gBrowser.showTab(tab);
-        });
-      });
       iQ(window).bind("unload", function() {
         self.uninit();
       });