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.

function compare(a, b) {
      return a - b;
    }
    
    const orderedX = [rect1[0], rect1[2], rect2[0], rect2[2]].sort(compare);
    const orderedY = [rect1[1], rect1[3], rect2[1], rect2[3]].sort(compare);
    const result = [];
    rect1 = Util.normalizeRect(rect1);
    rect2 = Util.normalizeRect(rect2);
    
    if (
      (orderedX[0] === rect1[0] && orderedX[1] === rect2[0]) ||
      (orderedX[0] === rect2[0] && orderedX[1] === rect1[0])
    ) {
      
      result[0] = orderedX[1];