rem: if (index != "nothing_available" && value) 
add: if (index != "nothing_available" && value) 
context: function executeUrlBarHistoryCommand( aTarget)   {    var index = aTarget.getAttribute("index");    var value = aTarget.getAttribute("value");    if (index != "nothing_available" && value)       {        gURLBar.value = value;        BrowserLoadURL();      }  } 
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/8e06aebd421e1b4103d466abb93a17b36fbda2dd/sessionHistoryUI.js/clean/suite/browser/sessionHistoryUI.js