Rated 3 out of 5 stars

This should really be part of ff like in Chrome. However, I have the issue that the passwords are not updated once they are set (i.e. if a password is changed and I enter the new one, ff asks me to update it but it is not updated, neither in the keychain nor in the ff password manager). Am I doing something wrong?

Yes, I still can't understand why FF doesn't support it natively. The extension should "just work" but there are lots of moving pieces controlled by Mozilla and Apple so when it fails it can be hard to work out why.

You can try turning on debug logging as explained on the add-on page and see if that highlights the problem. I'm afraid I don't have much time to spend on this these days but if the problem isn't clear, email the logs to me and I'll see if I can spot it easily.