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Firefox extension login: Unexpected error #218
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Originally created by @jwefers on GitHub.
Vaultwarden Support String
Your environment (Generated via diagnostics page)
Config & Details (Generated via diagnostics page)
Show Config & Details
Environment settings which are overridden: DOMAIN, SIGNUPS_ALLOWED, ADMIN_TOKEN
Config:
Vaultwarden Build Version
1.33.2
Deployment method
Official Container Image
Custom deployment method
No response
Reverse Proxy
traefik 3.3.3
Host/Server Operating System
Linux
Operating System Version
Linux, Windows,
Clients
Browser Extension
Client Version
Firefox 135.0
Steps To Reproduce
Dear VW team,
Login on Firefox extension on any OS fails with "unexpected error". Desktop client works fine. This is the case for multiple weeks, but i didn't have time to investigate yet.
Steps:
I do not get as far as being prompted for 2FA.
Expected Result
Reaching 2FA prompt, then successfully logged in
Actual Result
Unexpected error after entering Master password
Logs
Screenshots or Videos
Extension logs in FF debugging console:

Additional Context
So the client sends an apparently empty or broken /connect/token request and the server returns 400 with "no 2FA token provided". In addition, i get an email "Incomplete Two-Step Login from Firefox" - but it happens within milliseconds.
Logging in to bitwarden.com from FF extension works fine.
For comparison, the vaultwarden server log for a successful login from the Bitwarden Linux Desktop Client (2025.1.4):