Rated 4 out of 5 stars

bởi Firefox user 682d7c vào Tháng 12. 8, 2017 · liên kết thường trực

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.