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 (!url) {
    return null;
  }
  try {
    if (options && typeof url === "string") {
      
      if (options.addDefaultProtocol && url.startsWith("www.")) {
        const dots = url.match(/\./g);
        
        
        if (dots && dots.length >= 2) {
          url = `http://${url}`;
        }
      }
      
      
      if (options.tryConvertEncoding) {
        try {
          url = stringToUTF8String(url);
        } catch (ex) {}
      }
    }
    const absoluteUrl = baseUrl ? new URL(url, baseUrl) : new URL(url);
    if (_isValidProtocol(absoluteUrl)) {
      return absoluteUrl;
    }
  } catch (ex) {