Works in Firefox (w/ the security.webauth.u2f pref set to true)!
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Replying to @ciphercoffee
Will it work sometime soon without flipping a pref?

Jun 27, 2018 · 5:58 PM UTC

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Replying to @davidbaron
Twitter should use Web Authentication... I need to confirm that they aren't, that they are using the deprecated standard. (I'm rather sleep deprived, and getting worse.) We will not be enabling U2F by default.
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Okay, confirmed - they're using the deprecated FIDO U2F standard, not the W3C WebAuthn standard. That's sad. :(
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