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They work with Firefox for me on desktop (mac/linux). This is _very_ recent though.

Passkeys in Firefox also work for me on mobile but not with Bitwarden, Bitwarden's blog says passkey sync on mobile is "coming soon".

Can confirm passkeys work with Firefox in Linux. And this is using Firefox ESR on Debian stable too.

Yeah my bad. It works with 119. Thank you both.

Yep and I can further confirm it works in 115.4.0esr as well which is the current version in Debian stable.