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.

if (!this.contentVisible) {
      return;
    }
    this.groupLevel--;
    const groupCtx = this.ctx;
    this.ctx = this.groupStack.pop();
    
    
    this.ctx.imageSmoothingEnabled = false;
    if (group.smask) {
      this.tempSMask = this.smaskStack.pop();
    } else {
      this.ctx.drawImage(groupCtx.canvas, 0, 0);
    }
    this.restore();
  }
  beginAnnotations() {