At <https://forums.freebsd.org/account/security> I could not see an obvious way to log out from all devices.
So, in Firefox on FreeBSD, I:
So, in Firefox on FreeBSD, I:
- enabled multifactor authentication
- backed up codes
- changed my password
- logged out
- logged in.
- when (again) I log out on FreeBSD, a minute or so from now, I'll be logged out everywhere.