title: Debugger doesn't show frame html source
body: <p>I'm using Firefox developer edition, trying to debug a page (html+javascript) in a frame.
  With Firefox 33, in the debugger section I can see the source code of the page inside the frame, activate breakpoints...</p>
  
  <p>My problem with developer edition is that it doesn't show the html code of the page, although it is selected in the left side of the toolbar. It shows some html code, but it's not from the selected page. I can't locate where is it from.</p>
  
  <p>Is there a way to have the same behaviour in debugger for firefox 33 and developer edition?</p>
  
  <p>Thanks in advance, best regards</p>