add:    var prefs = Components.classes[prefContractID].getService(Components.interfaces.nsIPref); if (prefs) prefs.SetBoolPref("browser.download.keepProgressWndAlive", keepProgressWindowUpBox.checked);  
context: function onUnload() {   // Cancel app launcher.   if (helperAppLoader)   {     try      {       helperAppLoader.closeProgressWindow();       helperAppLoader = null;     }           catch( exception ) {}   }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/e95bc5292e900df5d11b32636e6eedb3ac76e9d5/helperAppDldProgress.js/clean/xpfe/components/ucth/resources/helperAppDldProgress.js