Review for Mark All Read:WE by roneo.org
Rated 1 out of 5 stars
Not worlking on Thunderbird 78.14.0 (64-bit)
Requires the Permission "to Create, rename, or delete your mail account folders".. why?
(Ping me here if I can help sending debug information)
To create your own collections, you must have a Mozilla Add-ons account.