Best I can tell, here is my problem running on xubuntu dapper:

webhttrack starts htsserver and browser "x-www-browser", and tracks PID of
"x-www-browser".

"x-www-browser" launches my default browser, which happens to be
/usr/bin/epiphany, then quits

htsserver detects PID of "x-www-browser" is no longer active, so quits

epiphany gets "'localhost' refused the connection" error.

I'm guessing if I point htsserver directly to /usr/bin/epiphany this would
solve the problem. How do I tell it what browser to use?