rem: histMenu.addEventListener("popupshowing", function() { HistoryMenu.populateUndoSubmenu(); }, false); 
add: m.addEventListener("command", function(aEvent) { undoCloseTab(aEvent.originalTarget.getAttribute("value")); }, false); 
context:   histMenu.addEventListener("popupshowing", function() { HistoryMenu.populateUndoSubmenu(); }, false);
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/d94a17c8fc24fd21aeac4e1454ede2328e38116f/browser.js/buggy/browser/base/content/browser.js