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._readyCapability.promise;
    }
    get port() {
      return this._port;
    }
    get messageHandler() {
      return this._messageHandler;
    }
    _initializeFromPort(port) {
      this._port = port;
      this._messageHandler = new MessageHandler("main", "worker", port);
      this._messageHandler.on("ready", function () {
        
        
      });
      this._readyCapability.resolve();
    }
    _initialize() {