Gnome users currently can't upgrade to firefox2 because yelp won't
accept it as a substitute for firefox.  I believe this is due to
the inclusion of www/seamonkey/gecko-depends.mk, which contains:

BUILDLINK_API_DEPENDS.firefox+=         firefox>=1.5nb2
.include "../../www/firefox/buildlink3.mk"

Is there a way of allowing yelp to accept either firefox?