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 worker = eval("require")(getWorkerSrc());
        return worker.WorkerMessageHandler;
      }
      await loadScript(getWorkerSrc());
      return window.pdfjsWorker.WorkerMessageHandler;
    };
    loader().then(fakeWorkerCapability.resolve, fakeWorkerCapability.reject);
    return fakeWorkerCapability.promise;
  }
  function createCDNWrapper(url) {
    
    
    
    const wrapper = "importScripts('" + url + "');";
    return URL.createObjectURL(new Blob([wrapper]));
  }
  /**
   * PDF.js web worker abstraction that controls the instantiation of PDF
   * documents. Message handlers are used to pass information from the main
   * thread to the worker thread and vice versa. If the creation of a web
   * worker is not possible, a "fake" worker will be used instead.
   */
  
  class PDFWorker {