Rated 3 out of 5 stars

Pls, fix it!
- not zoom
- not sound notification of new messages

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

Hi! And thanks for the review.
- I'm not sure when you say "not zoom" but it's not a feature of the add-on.
- The icon only shows the unread emails and you need to have enabled the "Unread message icon" (Settings > Labs > Unread message icon). If you have this enable, please let me know the FF version and your OS you use.
- The sound notification isn't a feature of the add-on.