On Firefox the normal Android FIDO/U2F/WebAuth screen does not show up that lets you select if you want to auth with an on-device security key, an NFC key, or a USB key.
Instead, a custom pop-up shows which has no support for USB or NFC keys (like the YubiKey).
Could Firefox please either add support for USB/NFC security keys or just use the built-in android security key feature which already supports this.