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)

const [openAction, javaScript] = await Promise.all([
      openActionPromise,
      !this.pdfViewer.enableScripting ? pdfDocument.getJavaScript() : null,
    ]);
    if (pdfDocument !== this.pdfDocument) {
      return; 
    }
    let triggerAutoPrint = false;
    if (openAction?.action === "Print") {
      triggerAutoPrint = true;
    }
    if (javaScript) {
      javaScript.some(js => {
        if (!js) {
          
          return false;
        }
        console.warn("Warning: JavaScript support is not enabled");
        this.fallback(UNSUPPORTED_FEATURES.javaScript);
        return true;
      });
      if (!triggerAutoPrint) {