[Bug 2062148]

[Amin Bandali]

Okay I got my hands on a Yubikey and tested with it, and was able to
reproduce the issue.

As hinted at by the two "See Also" links added by gerard-majax, this
appears to be a snapd 2.62 regression, and should be fixed in the
upcoming snapd 2.63 release.  If you'd like to switch to that and test
it right now, you can run `sudo snap refresh --beta snapd`, and later
when 2.63 is released to stable run `sudo snap refresh --stable snapd`
to switch back to stable.  If that's not an option for you, plugging in
the Yubikey *before* launching the Firefox snap seems to work reliably
as a temporary workaround.

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https://bugs.launchpad.net/bugs/2062148

Title:
  Snapd 2.62 brakes U2F in Firefox

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