Rated 5 out of 5 stars

Από τον/την clem20 στις Δεκ. 9, 2020 · μόνιμος σύνδεσμος

It works as well as the old version of "Deselect on Delete". Wonderful! BIG THANKS to the author(s)!

Concerning permissions you should not be too much worried. I can confirm that during installation of add-on version 3.1 (from 2020-12-09) it asks for "full permissions". However, after installation the Thunderbird add-on manager tells that it "does not need any permissions".
Every other add-on which I installed also asked for "full permissions" during installation. It may indeed be a bug in TB 78.5.1.
Also please keep in mind that the permission request pop-up is something new in TB78. The old TB68 did not have it. Do not be scared by this new feature.