add: return false; 
context: function HandleClickEvent( aEvent ){  if( aEvent.detail == 2 && aEvent.button == 0 && aEvent.target.localName == "listitem") {    if (!onStart())      return false;    window.close();    return true;  }}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/233808a23b19d9cdcbbee6a2e7b1d1b3e508e4e7/profileManager.js/clean/profile/resources/content/profileManager.js