context: function onUnload() {  // remember the user's decision for the checkbox.  var prefs = Components.classes[prefContractID].getService(Components.interfaces.nsIPref);  if (prefs)    prefs.SetBoolPref("browser.download.progressDnldDialog.keepAlive", keepProgressWindowUpBox.checked);   // Cancel app launcher.   if (helperAppLoader)   {     try      {       helperAppLoader.closeProgressWindow();       helperAppLoader = null;     }           catch( exception ) {}   }}
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