FIDO2 Security Key (e.g. Yubikey) Support is entirely broken on Firefox mobile and has been for weeks
FIDO2 Security Key (e.g. Yubikey) Support is entirely broken on Firefox mobile and has been for weeks. Screens that should pop up an interface to use my security key (e.g. after I've typed my password in to Google, in order to do multi factor auth) simply do not show the pop up. This is an absolute P0 issue that makes the browser entirely worthless as a default browser on a device, as many apps want to use Webauthn through the browser to do FIDO MFA. I will be forced to switch to an actual functional browser if this is not fixed soon.
This is on a Pixel 10A: 148.0.2 (Build #2016148295), 15542f265e9eb232f80e52c0966300225d0b1cb7 GV: 148.0.2-20260309125808 AS: 148.0.1 OS: Android 16
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The QA team initially attempted to reproduce the issue on a device running the February build of Android 16, but were unable to reproduce it.
After updating to the latest March Android 16 build, the issue was successfully reproduced on Firefox 148.0.1 on Google Pixel 9 Pro and Google Pixel 10 Pro devices. Confirming that the login fails on both google.com and https://www.passkeys.io/
It is worth mentioning that the issue was not reproduced on the Google Pixel 10 with the latest Android version, suggesting that only the Pro models may be affected.
We're going to fix it in the next release.