[TheNewsIsHere]

Firefox does support passkeys but their native implementation is behind a feature flag. Beyond that Firefox add-ons (such as those for password managers) can enable support for their own purposes.

For example 1Password can be used for passkeys in Firefox.

[ndriscoll]

I can't find that option's documentation. Do you have a link? The only documentation I've seen indicates that they only support hardware devices, and I don't own one.