title: Setting XMLHttpRequest.responseType forbidden all of a sudden?
body: <p>I've been using synchronous XMLHttpRequest with responseType set to "arraybuffer" for quite a while to load a binary file and wait until it is loaded. Today, I got this error:
  "Die Verwendung des responseType-Attributes von XMLHttpRequest wird im synchronen Modus im window-Kontekt nicht mehr unterstützt."
  which roughly translates to 
  "Usage of responseType for XMLHttpRequest in synchronous mode in window-context(?) no longer supported."</p>
  
  <p>Does anyone know how to fix this? I realy don't want to use an asynchronous request for something like this. </p>
  
  <pre><code>var xhr = new XMLHttpRequest();
  xhr.open('GET', url, false);
  xhr.responseType = 'arraybuffer';
  </code></pre>
  
  <p>Works fine in chrome.</p>