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)

if (this.pagesCount === 0) {
      return;
    }
    this.update();
  }
  _scrollIntoView({ pageDiv, pageSpot = null, pageNumber = null }) {
    scrollIntoView(pageDiv, pageSpot);
  }
  _setScaleUpdatePages(newScale, newValue, noScroll = false, preset = false) {