Rated 1 out of 5 stars

per Newrone el feb. 10, 2022 ·

"This extension will have full, unrestricted access to Thunderbird, and your computer"
Extensions requesting this permission might: Read, modify and execute *any file* on your computer.

Very dubious. I won't install it until this is fixed.

This review is for a previous version of the add-on (2.1.1). 

per Itagaki Fumihiko (desenvolupador) a feb. 10, 2022 ·

I think many other add-ons are the same.
Add-ons published on addons.thunderbird.net (ATN) have passed human review.
In addition, the source code of this add-on is open, and anyone can check it.