title: firebug: how to cd to an iframe
body: <p>I have a facebook canvas application that runs in an iframe.  I would like to debug my page in firebug but can not get the javascript to scope to the iframe that is running my app.  </p>
  
  <p>the iframe:</p>
  
  <pre><code>&lt;iframe frameborder="0" src="[app_url_removed]" name="iframe_canvas" id="iframe_canvas" class="canvas_iframe_util" style="height: 905px;"&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>i've tried all the following and none of them work:</p>
  
  <pre><code>cd(iframe_canvas)
  cd(window.iframe_canvas)
  cd(iframe_canvas.window)
  cd($('iframe_canvas'))
  </code></pre>
  
  <p>I have firefox 3.6.13
  and I have tried firebug 1.7a11 and firebug 1.6.2</p>
  
  <p>also tried the bookmarklet and various other things from this link <a href="https://stackoverflow.com/questions/2495313/firebug-and-jquery-selectors-in-an-iframe">Firebug and jQuery selectors in an iFrame</a> to no avail.</p>