Rated 5 out of 5 stars

a nice new Classic Address Sidebar, like the Contacts Sidebar,
but this works in
52.X and later !!
Niiccee' , and Thank you very much !
And Thank you very mutch for bring back, like previous speaker said .. big fad thumps up !!
And you be added on Watch : https://github.com/shimamu/thunderbird-custom-address-sidebar

edit/info: i have make a update with a X.X.1 version with german language files on my blackysgate.de/files

This review is for a previous version of the add-on (2.4).