title: Why do I get "Permission Denied" Firebug console errors while testing jQueryUI sortable?
body: <p>I'm getting errors on the Firebug Console while trying to test "connected" Sortable functionality using jQueryUI.  Here's the type of error I receive as soon as I drag a table row:  </p>
  
  <pre><code>Error: Permission denied to access property 'sortableItem'
    target[ name ] = copy;
  </code></pre>
  
  <p>If I turn Firebug off, the Sortable functionality seems to work just fine.</p>
  
  <p>Here's the code I'm testing:</p>
  
  <pre><code>&lt;!doctype html&gt;
  &lt;html lang="en"&gt;
  &lt;head&gt;
  &lt;meta charset="utf-8" /&gt;
  &lt;title&gt;ja test&lt;/title&gt;
  
  &lt;script src="http://code.jquery.com/jquery-1.9.1.js"&gt;&lt;/script&gt;
  &lt;script src="http://code.jquery.com/ui/1.10.1/jquery-ui.js"&gt;&lt;/script&gt;
  &lt;script&gt;
  $(document).ready(function(){
  $( ".connected" ).sortable({
          items: 'tbody &gt; tr',
          connectWith: ".connected",
  
          update: function(e, ui){
                // AJAX code will go here
                alert("hello"); // testing only
                  }
  
          });
  });
  &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;      
  
  &lt;table border="0" width="50%" class="connected" id="unranked"&gt;
      &lt;thead&gt;
            &lt;tr class="body-bold"&gt;
              &lt;td&gt;id&lt;/td&gt;
              &lt;td&gt;Start Date &lt;/td&gt;
              &lt;td&gt;End Date &lt;/td&gt;
              &lt;td&gt;&amp;nbsp;&lt;/td&gt;
            &lt;/tr&gt;
       &lt;/thead&gt;
       &lt;tbody id="sortableUnranked"&gt;
          &lt;tr id="contentid-9896"&gt;
              &lt;td&gt;A9896&lt;/td&gt;
              &lt;td&gt;2013-02-21&lt;/td&gt;
              &lt;td&gt;2013-03-31&lt;/td&gt;                 
              &lt;td&gt;&lt;input class="edit-button" type="button" name="edit" value="Edit"&gt;&lt;/td&gt;         
          &lt;/tr&gt;
       &lt;/tbody&gt;
  &lt;/table&gt;
  </code></pre>