[LargoLasskhyfv]

You could also do https://wiki.archlinux.org/title/Firefox/Profile_on_RAM , or more generally https://wiki.archlinux.org/title/Profile-sync-daemon or https://wiki.archlinux.org/title/Anything-sync-daemon

Or just skip that install to media stuff altogether, and run from some live distro booted into RAM, and running from there :-)