Rated 1 out of 5 stars

Does not work at all. By clicking on the close button, the mail client is neither minimized or closed.

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

It is possible that you use an unsupported version of Thunderbird and/or there is another add-on conflicting with Minimize on Close. If you need help, contact the support email address with more details – the rating feature here is not designed for conversations.