Bug#599618: How to change user agent string for epiphany?

[Dominique Brazziel]

I won't bother reporting this to the ATT/Yahoo! webmaster.  That would
be a waste of time.

As far as the user agent string, the user agent switcher extension
I found at http://chrispederick.com/work/user-agent-switcher/ doesn't
seem to support epiphany.  

I tried 'about:config' first to see if 
I could do a manual change but epiphany doesn't seem to have
'about:config' support.