title: Unable to download a blob file with Firefox, but it works in Chrome?
body: <p>Here is my download code:</p>
  
  <pre><code>var mimeType = this.getMime(obj);
  var ab = this.base64ToArrayBuffer(obj[key]);
  var blob = new Blob([ab.buffer], {
      type : mimeType
  });
  var result = this.bintostring(blob);
  var url = window.URL.createObjectURL(blob);
  var a = document.createElement('a');
  a.href = url;
  a.download = result.filename;
  a.target = '_blank';
  a.click();
  window.URL.revokeObjectURL(url);
  </code></pre>
  
  <p>During debugging, I do not see any exceptions.</p>