title: adding an iframe to facebook does not work anymore since ~2 weeks
body: <p>I'm writing a firefox extension to read out the privacy settings of a facebook user. (not a facebook app!!) To switch between different websites of facebook I used iframes, but this isn't working anymore. I have this problem since 2 weeks.</p>
  
  <pre><code>$('#globalContainer').append('&lt;iframe id="reusable_iframe" src="" width="90%"  
  height="400" name="reusable_iframe"&gt;&lt;/iframe&gt;');
  //....
  $('#reusable_iframe').attr('src', link);
  </code></pre>
  
  <p>I'm follow the Same origin policy and it was working just fine since a 2 weeks!? an example:</p>
  
  <pre><code>var link = "http://www.facebook.com/editprofile.php?sk=basic";
  </code></pre>
  
  <p>Now I just get a blank iframe :( </p>
  
  <p>the funny thing is, that if I add "http://www.youtube.com/embed/Qi_AAqi0RZM" or "http://trololololololololololo.com/" to the iframe it's working without a problem... :/</p>
  
  <p>did facebook change the rules for own links in iframes? Is there a workaround? Is there an other way for me to scan different sites with firefox-extensions? i would prefer to stay with content-scripts....</p>
  
  <p>Edit: This is how it looks at firebugs... also funny is that the facebook page <a href="http://www.facebook.com/undefined" rel="nofollow">http://www.facebook.com/undefined</a> is working however!?</p>
  
  <pre><code>&lt;iframe id="areusable_iframe" width="90%" height="400" name="areusable_iframe" src="http://www.facebook.com/"&gt;
    &lt;html&gt;
      &lt;head&gt;
      &lt;/head&gt;
      &lt;body&gt;
      &lt;/body&gt;
    &lt;/html&gt;
  &lt;/iframe&gt;
  </code></pre>