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CloseReview for Windows Taskbar Unread Badge by dkaplowitz
Rated 4 out of 5 stars
This is a MUCH welcome addition to thunderbird (a feature that should just be in the application if you ask me). Only problem is it consistently shows 3 unread messages even though I don't have any unread messages (I've been through every IMAP folder in great detail to try and find the 3 culprits!) Otherwise great!
This review is for a previous version of the add-on (1.2.20181207).To create your own collections, you must have a Mozilla Add-ons account.