ofcourse your demo works.....  ( sigh )

 

I did "fix" the problem. I was using a link to submit my form that looked like:

<a href="BLOCKED SCRIPTdocument.forms[0].submit();"><img.. /></a>

 

That worked submitting the form, it just didn't post back the new editor HTML (in FireFox) as described above.

So I got rid of my <a> link and put in an <asp:imagebutton> to submit the form. It worked.

 

I don't know what the difference is, but it worked.