That"s the reason they’re doing it, so you tell them more details about your family relations, which equals money to them

www-client/firefox does not have a pipewire use flag, it uses pulseaudio which can use the pipewire backend for playing the audio (not sure about the specifics) https://wiki.gentoo.org/wiki/PipeWire for all issues, I’d recommend #gentoo on irc.libera.chat

Are you not using a desktop profile? That sets the sane defaults you’re missing