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: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/cf11c66bf7464b459160ebc1ec2ccef6fa7513bd/browser.js/clean/browser/base/content/browser.js