Strange bug with Firebug and CKEditor 3.2.1

Hi,

I've upgraded my CMS with the lastest version of CKEditor (3.2.1) yesterday, and a strange bug has appeared. When i retrieve the content of a CKEditor's instances via Javascript (CKEDITOR.instances.editor1.getData();) , it adds at the end of the content :

<div firebugversion="1.5.3" id="_firebugConsole" style="display: none;">
   &nbsp;</div>
<br />

It's not a big problem at all, my customers didn't own Firebug and in all case, adding an empty div don't hurt the renderer. But i'd like to understand why it happens. (Did you change the storage model of the content of an instance ? Firebug tracking in Iframe ?)