I was wondering if WebGL is considered stable enough to be enabled by default. It makes some PDFs render much faster and it has been off by default for a while now, so we have had quite some time to test it.

If we decide to enable WebGL by default, we should not forget to update https://github.com/mozilla/pdf.js/blob/master/extensions/chromium/preferences_schema.json#L39 as well.

/cc @yurydelendik 
/cc @Snuffleupagus (because IIRC you were testing WebGL too)

PDFViewerApplication.appConfig.toolbar.pageNumber.select();
        handled = true;
        break;
    }
  }
  if (handled) {
    if (ensureViewerFocused && !isViewerInPresentationMode) {
      pdfViewer.focus();
    }
    evt.preventDefault();
    return;
  }
  
  
  const curElement = getActiveOrFocusedElement();
  const curElementTagName = curElement?.tagName.toUpperCase();
  if (
    curElementTagName === "INPUT" ||
    curElementTagName === "TEXTAREA" ||
    curElementTagName === "SELECT" ||
    curElement?.isContentEditable
  ) {
    
    if (evt.keyCode !==  27) {
      return;
    }
  }
  
  if (cmd === 0) {