rem: try { getWebNavigation().gotoIndex(index); 
add:  var where = whereToOpenLink(aEvent);  if (where == "current") {   try { getWebNavigation().gotoIndex(index); } catch(ex) { return false; } return true; 
context: function gotoHistoryIndex(aEvent){  var index = aEvent.target.getAttribute("index");  if (!index)    return false;  try {    getWebNavigation().gotoIndex(index);  }  catch(ex) {    return false;  }  return true;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/a7da35e3fe387386e620c65c8f8cb34673b389f2/browser.js/clean/browser/base/content/browser.js