I like it. Rated 4 out of 5 stars
The only complaint I have is the unread count does not showup so you don't know when you have mail.This review is for a previous version of the add-on (22.214.171.124-signed).
It should show up like it's shown in the images.
The add-on "scans" the email every 5 minutes (by default, but you can change it in the options). So, it no shows the unread emails when they arrive.
If not work like this, please contact me.