<snip>
> What would be a good source of information on the meaning of all the
> mozilla specific use flags?  I'm curious about the ones that are not
> referring to removing the irc, composer and mail components of mozilla. 
> I vaguely remember seeing something on this topic but cannot recall
> where I found this information previously.
> 
> This is for the purposes of building a lean and fast bare bones mozilla
> for web browsing.
<snip>

Try /usr/portage/profiles/use.desc for info on use flags, but I would personally recommend phoenix-cvs if you want a nice fast browser (stripped down mozilla). There's an ebuild at cvs.gentoo.org/~sethbc if you're interested.

Graham