Review for Windows Taskbar Unread Badge by Firefox user de1ecb
Rated 5 out of 5 stars
Nice extension usually. But needs updating? Doesn't show as being incompatible with Thunderbird v78.x but doesn't appear to work either.
This review is for a previous version of the add-on (2.0.0).To create your own collections, you must have a Mozilla Add-ons account.