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)

evt.preventDefault();
  evt.returnValue = "";
  return false;
}
const PDFPrintServiceFactory = {
  instance: {
    supportsPrinting: false,
    createPrintService() {
      throw new Error("Not implemented: createPrintService");
    },
  },
};
export {
  DefaultExternalServices,
  PDFPrintServiceFactory,
  PDFViewerApplication,
};