Puntuado con 3 de 5 estrellas

The extension works when the KeePassXC database is unlocked, but whenever Thunderbird refreshes an account and the database is locked, it will open a new browser page asking for OAuth2 confirmation for each account.

Esta valoración es de una versión anterior del complemento (1.8). 

As the access tokens for oauth are stored in the KeePassXC database Thunderbird has no way to know these when the database is locked. This behaviour is intended and a security feature.