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)

return this.messageHandler.sendWithPromise("GetStructTree", {
      pageIndex,
    });
  }
  getOutline() {
    return this.messageHandler.sendWithPromise("GetOutline", null);
  }
  getOptionalContentConfig() {
    return this.messageHandler
      .sendWithPromise("GetOptionalContentConfig", null)
      .then(results => {
        return new OptionalContentConfig(results);
      });
  }
  getPermissions() {
    return this.messageHandler.sendWithPromise("GetPermissions", null);
  }
  getMetadata() {
    return this.messageHandler
      .sendWithPromise("GetMetadata", null)
      .then(results => {
        return {
          info: results[0],
          metadata: results[1] ? new Metadata(results[1]) : null,
          contentDispositionFilename: this._fullReader?.filename ?? null,
          contentLength: this._fullReader?.contentLength ?? null,
        };
      });
  }
  getMarkInfo() {