this post was submitted on 23 Aug 2025
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I’ve had them working on Firefox using series 5 Yubikeys and using KeePassXC + KeePassXC-Browser extension. These were on MacOS, though I’m not sure that matters.
The current Yubikey firmware can store 100 passkeys. Mine is older and can only hold 25. The firmware can’t be updated. https://www.yubico.com/resource/whats-new-in-yubikey-5-7/