Fedora packages a Flatpak Firefox themselves, based off the RPM. So its good too, but lacks codecs with currently no way to enable them so yeah. They would need am extension of some sort hosted on Flathub. So simply using Firefox Flatpak from Flathub makes more sense.
I got a Nitrokey for Heads but for some reason it never arrived? I can say these things are very expensive. And Heads uses PGP and not others.