rem: m.addEventListener("command", function() { for (var i = 0; i < undoItems.length; i++) undoCloseTab(); }, false); 
add: function () { return browser.warnAboutClosingTabs(true); }); 
context:   m.addEventListener("command", function() {    for (var i = 0; i < undoItems.length; i++)      undoCloseTab();  }, false);
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/fbc4c02a7ffdec5e1e6495bcfd598593d1d20fd8/browser.js/buggy/browser/base/content/browser.js