title: Change JavaScript on the fly
body: <p>I use Internet Explorer (IE) to browse a website that uses some non-standardized JavaScript code. Particularly, <code>document.all</code> which is not supported in Chrome nor Firefox anymore.<br>
  My aim is to use Chrome or Firefox for browsing it, and this is possible if the <code>document.all</code> is replaced by <code>document.getElementsByTagName("*")</code> as per my research. </p>
  
  <p>I don't have access to the server side in order to make this change, and I am looking for a way to do this modification in the client side. I tried to directly make the modification using DevTools of Chrome (Windows 10) but when I tried to save my changes I got an error saying that:</p>
  
  <blockquote>
    <p>change to this file were not saved to file system</p>
  </blockquote>
  
  <p>Is there a way to resolve this? I also appreciate any alternative solutions. </p>