Probably not directly helpful, but Nix packages for Chromium and Electron apps are set up so that you can switch to native Wayland mode globally by setting an environment variable, NIXOS_OZONE_WL=1
I don’t know of any global setting that isn’t distro-specific.
To start the firewall after you stopped it:
systemctl
is part of systemd - it starts and stops various services, shows statuses, lists available services, etc.There is documentation on opening ports here, plus more details on enabling & disabling the firewall: https://docs.fedoraproject.org/en-US/quick-docs/firewalld/#_controlling_ports_using_firewalld