Rated 5 out of 5 stars

Excellent, exactly what I was looking for. I think the option to hide login form should be password protected though. That way someone cannot just easily disable it in the option menu.

This review is for a previous version of the add-on (1.1.4). 

password protection

No worry, only the username-field is revealed, passwords themselves never show up in the formhistory. So I believe password protection is unnecessary.