Rated 5 out of 5 stars

Από τον/την janffm στις Ιούν. 1, 2018 · μόνιμος σύνδεσμος

The original "Contacts Sidebar" does not work anymore on TB 52. There is a new similar addon called "Custom Address Sidebar" with the same functions!
https://addons.mozilla.org/de/thunderbird/addon/custom-address-sidebar/