Auto-connecting the u2f-devices interface for the firefox snap

Firefox has supported WebAuthn since version 60, which enables use of CTAP1 (FIDO U2F) devices as second factors. It will soon support CTAP2 (e.g., FIDO2) as well.

Since WebAuthn is our best technical defense against phishing as its known today, it should be made as simple as possible for end users to use that defense. I recommend enabling this as a default.

(This is in response to Bug 1594375 at Mozilla)

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Please note this has been previously discussed and preliminary positive feedback was given by @jdstrand here: U2F not working in Firefox Snap and similar request for Chromium was granted here: Auto-connecting the u2f-devices interface for the chromium snap