Review for Mailbox Alert by orinoco
Rated 5 out of 5 stars
Nice app, might have more config options: if clicking new mail alert it might open just the new mail not the whole main window. Over 10+ new main window openings the Thunderbird stalls.
This review is for a previous version of the add-on (0.13.1).To create your own collections, you must have a Mozilla Add-ons account.