Coffer for Firefox is a small companion extension for Coffer, a self-hosted authenticator vault. Sign in to your Coffer server from the extension popup, view your active TOTP codes, and fill one-time-code fields on the active page with one click.
The Coffer tab does not need to be open. Your vault remains encrypted on the server and is decrypted locally in the extension after you enter your Coffer password.
