title: How to disable <br type="_moz" in contentEditable div in firefox
body: <p>Firefox automatically inserts a </p>
  
  <pre><code> &lt;br type="_moz"&gt;
  </code></pre>
  
  <p>in contentEditable divs on press of enter key. It also adds a &lt;br&gt; automatically when I insert any element through document.execCommand.</p>
  
  <p>This behavior is not present in other browsers.</p>
  
  <p>How to prevent this from happening in firefox.</p>