!!! Warning: couldn't find match for virtual/x11-web-browser in update (likely old /var/db/pkg entry) This is the warning I get when emerge is doing dependencies checking. Inside /var/db/pkg/virtual/x11-web-browser/VIRTUAL it's written: net-www/mozilla-0.9.7-r1
set virtual/x11-web-browser to net-www/mozilla
Also noted that after upgrading mozilla all new revision of mozilla got added to that file... net-www/mozilla-0.9.7-r1 net-www/mozilla-0.9.7-r2 net-www/mozilla-0.9.8
that's normal, all browsers that provide that functionality and that are merged on your system will be present