Review for FireTray by ma.shoujing
Rated 3 out of 5 stars
It looks somehow better than New Mail Icon. However, I'm not using it because it's not only triggered by mails but by news as well and I don't want to be bugged whenever my RSS reader downloads something.
This review is for a previous version of the add-on (0.2.3).To create your own collections, you must have a Mozilla Add-ons account.