rem: try { printProgress.processCanceledByUser = true; } catch( exception ) {return true;} 
add: try { printProgress.processCanceledByUser = true; } catch(e) {return true;} 
context: function onCancel () {  // Cancel app launcher.   try    {     printProgress.processCanceledByUser = true;   }   catch( exception ) {return true;}      // don't Close up dialog by returning false, the backend will close the dialog when everything will be aborted.  return false;}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/7017f5750d9b84c4e97e58393dba259da2a59e18/printPreviewProgress.js/clean/toolkit/components/printing/content/printPreviewProgress.js