rem: return IsMailFolderSelected(); 
add: var folderURI = GetSelectedFolderURI(); var server = GetServer(folderURI); return (server.canEmptyTrashOnExit?IsMailFolderSelected():false); 
context: function IsEmptyTrashEnabled(){    return IsMailFolderSelected();}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/65d20cc280a152b552ffab6306bea0b601bfef7f/mailWindowOverlay.js/clean/mailnews/base/resources/content/mailWindowOverlay.js