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)

this.pagePromises[pageIndex] = promise;
    return promise;
  }
  getPageIndex(ref) {
    return this.messageHandler
      .sendWithPromise("GetPageIndex", {
        ref,
      })
      .catch(function (reason) {
        return Promise.reject(new Error(reason));
      });
  }
  getAnnotations(pageIndex, intent) {
    return this.messageHandler.sendWithPromise("GetAnnotations", {
      pageIndex,
      intent,
    });
  }
  saveDocument() {
    return this.messageHandler
      .sendWithPromise("SaveDocument", {
        numPages: this._numPages,
        annotationStorage: this.annotationStorage.serializable,
        filename: this._fullReader?.filename ?? null,
      })
      .finally(() => {
        this.annotationStorage.resetModified();
      });
  }
  getFieldObjects() {