add:  gDownloadManager.DBConnection.removeFunction("getDisplayHost"); 
context: function Shutdown(){  gDownloadManager.removeListener(gDownloadListener);  let obs = Cc["@mozilla.org/observer-service;1"].            getService(Ci.nsIObserverService);  obs.removeObserver(gDownloadObserver, "download-manager-remove-download");  clearTimeout(gBuilder);  gStmt.reset();  gStmt.finalize();}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/ed56745ee3e031c1bb1000bd008e79dcd79d1568/downloads.js/buggy/toolkit/mozapps/downloads/content/downloads.js