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)

}
        break;
    }
  }
  if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC || CHROME")) {
    const { eventBus } = PDFViewerApplication;
    
    if (cmd === 1 || cmd === 8) {
      switch (evt.keyCode) {
        case 83: 
          eventBus.dispatch("download", { source: window });
          handled = true;
          break;
        case 79: 
          if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
            eventBus.dispatch("openfile", { source: window });
            handled = true;
          }
          break;
      }
    }
  }
  
  if (cmd === 3 || cmd === 10) {
    switch (evt.keyCode) {
      case 80: 
        PDFViewerApplication.requestPresentationMode();
        handled = true;
        break;
      case 71: