> As far as I know, Firefox does not implement U2F exactly (one of the reasons support for it isn't enabled by default): https://twitter.com/jamespugjones/stat

> As far as I know, Firefox does not implement U2F exactly (one of the reasons support for it isn't enabled by default): https://twitter.com/jamespugjones/status/931324766782332928 https://twitter.com/jamespugjones/status/931324766782332928 Sort of. It's true that Firefox doesn't enable U2F by default (yet), but that's actually unrelated to the reasons that it doesn't work on Google domains. The real reason that Google's U2F only works in Chrome is that they rely on non-standard implementation details: https://twitter.com/ManishEarth/status/931534674224062464 https://twitter.com/ManishEarth/status/931534674224062464 For contrast, you can use U2F on Fastmail and Github in Firefox, because they don't rely on non-standard behavior.