This add-on is as good as using the TeamsID site itself.

1. It has no built-in passwords generator (while the site has).
2. It only captures the data you enter in web forms and provides no means of adding access information manually (while the site does).
3. It uses your authentication status on the TeamsID site. As soon as you sign out on the site, you can't access your passwords.

The add-on works fine for a single use case: access your stored passwords.