title: Why does my JavaScript / jQuery interaction with a child window raise a "permission denied" error?
body: <p>I have some code that I would swear was working a month ago. However, now the code throws a 
  <code>permission denied to get property Window.jQuery</code> error. I can see this error in the Firefox error console. </p>
  
  <p>The code in question belongs to a window that was opened via JavaScript. This code attempt to update the contents of a DIV in the opening page. In an attempt to update this DIV, I try to access it using the following script:</p>
  
  <pre><code>var confirmDiv = window.opener.jQuery("#confirmDiv");
  </code></pre>
  
  <p>However, this line is what triggers the permission denied error. Can someone explain to me how to use jQuery to update the contents of a DIV in an opening window?</p>