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CloseReview for Mailbox Alert by Magritte
Rated 3 out of 5 stars
I was looking for this functionality but it doesn't work in Thunderbird 3 beta. It would be great if you could make it TB3 compatible!
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.