Rated 5 out of 5 stars

Does what it says it does. The current thunderbird alert system is useless for anyone who receives a lot of mail. This extension is an excellent replacement.

A feature I would like to see in the future would be the ability to get alerts on receipt of mails from a specified list of addresses, or to specify a list of addresses you don't want to trigger a notification.

This review is for a previous version of the add-on (0.13.1).