Review for CardBook by padman
Rated 4 out of 5 stars
There is an issue if you update from v94 to V96 maybe because there is a migration process of vcard in V95 that is not in V96.
So if you update your thunderbird and your addon to V96 and it doesn't work, you have to manually download and install V94 then V95 and then V96. And it works.
To create your own collections, you must have a Mozilla Add-ons account.