onError();
   return;

   try {
       wdw.print();
   } catch (e) {
       onError();
   }

I would like to find a way to detect when the print dialog is closed in Firefox (whether the user clicks "Print" or "Cancel"). My goal is to automatically close the opened tab once the print dialog is dismissed. Currently, I trigger the print dialog like this: var wdw = window.open(fileUrl, '_blank'); if (!wdw) { onError(); return; } setTimeout(function () { try { wdw.print(); } catch (e) { onError(); } }, 100); However, I haven't found a reliable way to detect when the print dialog is closed so that I can close the tab accordingly. In Chrome, I was able to achieve this by monitoring focus events and checking document.activeElement. This allowed me to determine when the print dialog was closed and automatically close the tab afterward. However, this approach does not seem to work in Firefox. Is there a way to track when the print dialog is dismissed in Firefox?