add:  clearTimeout(gBuilder); gStmt.reset(); gStmt.finalize(); 
context: function Shutdown(){  gDownloadManager.removeListener(gDownloadListener);  let obs = Cc["@mozilla.org/observer-service;1"].            getService(Ci.nsIObserverService);  obs.removeObserver(gDownloadObserver, "download-manager-remove-download");}
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/9810b8f68ff07897884a4823d5058725fda85355/downloads.js/clean/toolkit/mozapps/downloads/content/downloads.js