#14 GNU Icecat (?), Iceweasel, Icedove, and related ports

Once specific ports build (www/mozilla-firefox and www/chromium, for instance), they should be replaced with their respective libre deriviatives.

www/chromium: Use the ungoogled-chromium patchset, maybe, or at least Debian's.
www/mozilla-firefox: Use Parabola's Iceweasel patchset.
www/mozilla-firefox: Maybe base a GNU Icecat port on mozilla-firefox'es.
www/seamonkey: Use Parabola's Iceape patcheset.
mail/thunderbird: Use Parabola's Icedove patchset.