# Nitrokey 3C NFC unter Linux with Firefox

**URL:** https://support.nitrokey.com/t/nitrokey-3c-nfc-unter-linux-with-firefox/7152
**Category:** FIDO2 / Nitrokey 3
**Created:** [August 20, 2025, 6:23pm UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-unter-linux-with-firefox/7152 "2025-08-20T18:23:30Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![a.prue](https://support.nitrokey.com/letter_avatar_proxy/v4/letter/a/48db29/32.png) [@a.prue](https://support.nitrokey.com/u/a.prue)
#### Post date: [August 20, 2025, 6:23pm UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-unter-linux-with-firefox/7152/1 "2025-08-20T18:23:30Z")

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Hello,  
I have a Nitrokey 3c and would like to use it with Linux (Tuxedo OS). I have installed the app and the key is recognized, but unfortunately it is not recognized when using Firefox. What can I do?

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### Author: ![geoW](https://support.nitrokey.com/user_avatar/support.nitrokey.com/geow/32/1888_2.png) [@geoW](https://support.nitrokey.com/u/geoW)
#### Post date: [August 21, 2025, 5:04am UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-unter-linux-with-firefox/7152/2 "2025-08-21T05:04:12Z")

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> [@a.prue](#):
>
> it is not recognized when using Firefox.

Hi,  
don’t understand your question, what do you expect ff to do?  
You may check  
[WebAuthn.io A demo of the WebAuthn specification](https://webauthn.io/)

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### Author: ![Douglas\_Engert](https://support.nitrokey.com/user_avatar/support.nitrokey.com/douglas_engert/32/1915_2.png) [@Douglas\_Engert](https://support.nitrokey.com/u/Douglas_Engert)
#### Post date: [August 24, 2025, 10:42am UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-unter-linux-with-firefox/7152/3 "2025-08-24T10:42:55Z")

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> **[Installing OpenSC PKCS11 Module in Firefox, Step by Step](https://github.com/OpenSC/OpenSC/wiki/Installing-OpenSC-PKCS11-Module-in-Firefox,-Step-by-Step)**
>
> Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend - OpenSC/OpenSC

Also the web server needs to trust the CA that signed the certificate on the card.

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<div class="post-metadata">

### Author: ![a.prue](https://support.nitrokey.com/letter_avatar_proxy/v4/letter/a/48db29/32.png) [@a.prue](https://support.nitrokey.com/u/a.prue)
#### Post date: [August 24, 2025, 6:11pm UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-unter-linux-with-firefox/7152/4 "2025-08-24T18:11:33Z")

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Hallo,

everething is OK.

Thanks!

Arnd

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<div class="post-metadata">

### Author: ![Douglas\_Engert](https://support.nitrokey.com/user_avatar/support.nitrokey.com/douglas_engert/32/1915_2.png) [@Douglas\_Engert](https://support.nitrokey.com/u/Douglas_Engert)
#### Post date: [August 25, 2025, 2:47am UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-unter-linux-with-firefox/7152/5 "2025-08-25T02:47:26Z")

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Did it solve your problem?