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)

}
        cont();
      };
    }
    const finishPaintTask = async (error = null) => {
      
      
      
      if (paintTask === this.paintTask) {
        this.paintTask = null;
      }
      if (error instanceof RenderingCancelledException) {
        this._renderError = null;
        return;
      }
      this._renderError = error;
      this.renderingState = RenderingStates.FINISHED;
      if (this.loadingIconDiv) {
        div.removeChild(this.loadingIconDiv);
        delete this.loadingIconDiv;
      }
      this._resetZoomLayer( true);
      this.eventBus.dispatch("pagerendered", {
        source: this,
        pageNumber: this.id,
        cssTransform: false,
        timestamp: performance.now(),
        error: this._renderError,
      });
      if (error) {