Über dieses Add-on
This add-on adds two new columns called "Sender (@)" and "Recipient (@)" in
message list containing full, raw addresses of sender and recipient instead
of just names like in default columns.
This add-on is reimplementation of "Show address only" add-on, which stopped working
in Thunderbird 78. This add-on source is heavily inspired by "SFreq" add-on source by Jorg K.