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)

entry.h,
          0,
          -1,
          1,
          1
        );
        if (this.imageLayer) {
          const position = this.getCanvasPosition(entry.x, entry.y);
          this.imageLayer.appendImage({
            imgData,
            left: position[0],
            top: position[1],
            width: w,
            height: h,
          });
        }
        ctx.restore();
      }
    }
    paintSolidColorImageMask() {
      if (!this.contentVisible) {
        return;
      }
      this.ctx.fillRect(0, 0, 1, 1);
    }
    
    markPoint(tag) {
      
    }
    markPointProps(tag, properties) {