These ebuilds come from http://github.com/sjnewbury/multilib-overlay.
If you have some problems, go to the official site first.
epiphany : GNOME webbrowser based on the mozilla rendering engine ( http://www.gnome.org/projects/epiphany/ )
epiphany-extensions : Extensions for the Epiphany web browser ( http://www.gnome.org/projects/epiphany/extensions.html )
firefox : Firefox Web Browser ( http://www.mozilla.com/firefox )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a multilib
For Paludis use this rsync : rsync://gentoo.zugaina.org/multilib-portage
If you have a problem : ycarus(-at-)zugaina.org