Hi, anyone knows why I don't see the custom tab on LUCI --> Network --> firewall
fw4) is different than
/etc/firewall.user as such doesn't exist anymore (see
/etc/nftables.d/ as a rough equivalent). Both
fw4 and its outer luci interface are still being worked on quite actively, maybe it comes back, maybe it won't, either way it needs to be handled quite differently to hook up custom nftables commands at the right place.
In the mean time, use your preferred editor to work via
/etc/nftables.d/ (using nftables syntax, not iptables).