rem: m.addEventListener("command", function(aEvent) { undoCloseTab(aEvent.originalTarget.getAttribute("value")); }, false); 
add: undoCloseTabItem.addEventListener("command", function() { undoCloseTab(0); }, false); 
context:     m.addEventListener("command", function(aEvent) {       undoCloseTab(aEvent.originalTarget.getAttribute("value"));    }, false);
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/ac5036c596e3caa889bcdecdecc504507c8722a2/browser.js/clean/browser/base/content/browser.js