I just tested my version of Firefox (Fresh from Play Store) and it worked without issues on my end to login to the server.
The only browser I’m aware of which doesn’t support it is the Duck Duck Go Browser which is a shame. They don’t seem to care about enabling WebAuthn support.
Pocket id is my go to. I used to use Authentik, but it was overkill for us. Pocket ID is pretty simple to use and has a very nice interface to add your users and clients. Uncluttered and straight and to the point. Pocket ID doesn’t use UN/PW Combos. Instead, you use Passkeys as in webAuthn devices to log in, which IMHO is one of the better security paths.
I work from home, however my two systems (home and work) are on the same LAN, they don’t see each other for file sharing. I get paid via direct deposit like everyone else which means my pay stubs are all electronic. I print those out and then use WinSCP to copy those over to my desktop. No other files are ever sent.
At home, depending on the amount of files, I either use SFTP via Filezilla, or if the mood strikes me and for a single file, I will just use SCP if I’m already on the cli which is most of the time it seems anymore doing work on my personal servers. I’ve found that SFTP is faster at transferring than doing a copy/paste to the NFS share to the same drive.
I have several services. Home Assistant is not one as it’s still a WIP for the person who’s developing a solution. It works, but I’m sort of holding off until I can test it more with the mobile app.
https://github.com/christiaangoossens/hass-oidc-auth
But, to answer your question: I log into Tailscale with it. I also have it connected to Proxmox and Portainer Additionally, I have it connected to Pomerium so I can log into my FreshTomato Router with a fingerprint :) I also have a self hosted PasteBin connected to it.