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: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/27aa624605ef7f3086d4607a7e6b64acbe19d604/profileManager.js/clean/profile/resources/content/profileManager.js