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 createMeshCanvas;
})();
ShadingIRs.Mesh = {
  fromIR: function Mesh_fromIR(raw) {
    
    const coords = raw[2];
    const colors = raw[3];
    const figures = raw[4];
    const bounds = raw[5];
    const matrix = raw[6];
    const bbox = raw[7];
    const background = raw[8];
    return {
      getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {
        applyBoundingBox(ctx, bbox);
        let scale;
        if (shadingFill) {
          scale = Util.singularValueDecompose2dScale(ctx.mozCurrentTransform);
        } else {
          
          scale = Util.singularValueDecompose2dScale(owner.baseTransform);
          if (matrix) {
            const matrixScale = Util.singularValueDecompose2dScale(matrix);
            scale = [scale[0] * matrixScale[0], scale[1] * matrixScale[1]];
          }
        }
        
        
        const temporaryPatternCanvas = createMeshCanvas(