Rated 4 out of 5 stars

Από τον/την Χρήστης Firefox 682d7c στις Δεκ. 8, 2017 · μόνιμος σύνδεσμος

for thunderbird52 and linux, remove the old extension of contact sidebar and go to add-ons manager window.
Now drag-drop contactssidebar-1.7.1.zip file to this window and appears the option to install the new extension.