Review for CardBook by _Geronimo_
Rated 5 out of 5 stars
After looking all over the internet for an easy way to sync Apple´s iCloud contacts with Thunderbird I finally found Cardbook. Just install, choose "Apple" as network source and enter your iCloud User/PW (you need a one time password if you use two factor auth!). Works as expected!
This review is for a previous version of the add-on (11.3).To create your own collections, you must have a Mozilla Add-ons account.