In your home directory there is a hidden file called .xinitrc (you need to "ls -a" to see it). The following line opens the dillo browser:
if egrep -qv lowram /proc/cmdline 2>/dev/null; then
dillo /usr/share/doc/dsl/getting_started.html &>/dev/null &
torsmo 2>/dev/null &
fi
I deleted it, which of course made the browser not open at all, but you could probably change "/usr/share/doc/dsl/getting_started.html" to your webpage.