title: Unable to remove event listener via content script
body: <p>I have HTML page with a <code>form</code> tag that has a <code>submit</code> event listener attached to it via Javascript file.</p>
  
  <p>I want to remove this listener from content script in Chrome extension but it seems that it doesn't do anything. If I run the same code from the Chrome console, it is removed as expected.</p>
  
  <pre><code>$(function() {
    $('#someform').off('submit');
  });
  </code></pre>
  
  <p>Why?</p>