function () { return browser.warnAboutClosingTabs(true); }); 
m.addEventListener("command", function() { for (var i = 0; i < undoItems.length; i++) undoCloseTab(); }, false); 
    function () {      return browser.warnAboutClosingTabs(true);    });
5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5872/b570b85cc8257faa80b8d4c487dc6df4351b43c1/browser.js/clean/browser/base/content/browser.js