PDFs from lumileds.com do not load with PDF.js. Part of the background loads, then only the spinner continues while using 100% CPU. 

An example pdf is http://www.lumileds.com/uploads/17/DS61-pdf 

This behaviour occurs with both the release version of pdf.js in firefox 41.0.2 and the latest .xpi downloaded from this github page.

const transform = this.ctx.mozCurrentTransform;
    return [
      transform[0] * x + transform[2] * y + transform[4],
      transform[1] * x + transform[3] * y + transform[5],
    ];
  }
  isContentVisible() {
    for (let i = this.markedContentStack.length - 1; i >= 0; i--) {
      if (!this.markedContentStack[i].visible) {
        return false;
      }
    }
    return true;
  }
}
for (const op in OPS) {
  if (CanvasGraphics.prototype[op] !== undefined) {
    CanvasGraphics.prototype[OPS[op]] = CanvasGraphics.prototype[op];
  }
}
export { CanvasGraphics };