Firefox broken on Breezy latest (might be release relevant)

[Andreas Schildbach]

I'm posting this because this issue might be very relevant for the 
release, if this happens to be re-producable on other systems. Because 
the issue has had no reactions so far, I fear that it might just be 
overlooked. If no one should be able to reproduce, I'm sorry for the noise.

http://bugzilla.ubuntu.com/show_bug.cgi?id=17551

I just re-installed cleanly from 5.10RC + apt-get upgrade.

Now, I'm getting the following error popup on browsing various webpages 
that worked before (including the ubuntu bugzilla):

XML Parsing Error: no well-formed
Location: chrome://global/content/commonDialog.xul
Line Number 1, Column 1:

^ (pointer points to an empty line)

I re-arranged some GUI elements. I never had any problems with this 
arrangement.