rem: if (aCommand == "cmd_cleanUp") 
add: if (!window.gDownloadsView) return false;  switch (aCommand) { case "cmd_cleanup": 
context:   isCommandEnabled: function (aCommand)  {    if (aCommand == "cmd_cleanUp")       return gDownloadManager.canCleanUp;    return false;  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/42441b54422f51e39485c902f4b02d6124193ad6/downloads.js/buggy/toolkit/mozapps/downloads/content/downloads.js