In Tunderbird, when I attempt to access the properies of one of my existing
email accounts, I get an error in a popup window, complaining about some XML
thing.  I have been unable to even locate the offender.

The Thunderbird dialog says
> XML Parsing Error: not well-formed
> Location: chrome://messenger/content/AccountManager.xul
> Line Number 1, Column 7:
>
> anager"
> ------^

Obviously, that's malformed, but I cannot find any file where it lives, at
least not under my home directory,
and there's no ".xul" in the filenames belonging to Thunderbird.

Where should I be looking?

-- 
Kevin O'Gorman, PhD