So far so good

The functionality is competitive with the Lastpass addon, but there's a performance issue with the Keeper addon causing it to use significant CPU even while logged out and idle. Keeper is aware of the issue but it isn't resolved as of July 2020.

Fantastic plugin, works so very well with the mobile app!

The only minor issue is that in the past couple of versions, the session is lost and you have to re-enter your master password, which is a mild inconvenience.