rem: undoCloseTabItem.addEventListener("command", function() { undoCloseTab(0); }, false); 
add: histMenu.addEventListener("popupshowing", function() { HistoryMenu.populateUndoSubmenu(); }, false); 
context:     undoCloseTabItem.addEventListener("command", function() { undoCloseTab(0); }, false);
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/a4563fd98d91352892cc97a3a9a562b4d75ccf3d/browser.js/buggy/browser/base/content/browser.js