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)

ctx.stroke();
          ctx.restore();
        } else {
          const lineWidth = this.getSinglePixelWidth();
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            ctx.save();
            ctx.resetTransform();
            ctx.lineWidth = Math.round(this._combinedScaleFactor);
            ctx.stroke();
            ctx.restore();
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            ctx.lineWidth = Math.max(lineWidth, this.current.lineWidth);
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      ctx.globalAlpha = this.current.fillAlpha;
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    closeStroke() {
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    fill(consumePath) {