Rated 4 out of 5 stars

One some pages, the stored login is not shown, after the page has been loaded. Only by choosing the context menu "Anmeldedaten ändern/change login data(?)" the login name shows up.

Also it would be nice if only the login name could be stored (without a password). An obvious work around is to store a wrong/short password.

This review is for a previous version of the add-on (2.7). 

1. This is covered both in the video linked from the description and in the FAQ (see support site).

2. Sorry, no can do. The password manager simply refuses to accept a login with a "null or empty" password. I can't change that. I guess the Mozilla developers figure there's no point in using a password manager and not putting passwords in it.