评分4星,满分5星

I have two problems with card book
does It need VPN to sync! In Iran?
Editing note of a contact, duplicate the contact!

这个评论是针对附加组件的一个早期版本的(83.6)。 

no need of a VPN, sync is done like you access to internet...
I've not understood the other issue... do not hesitate to contact me directly here : cardbook.thunderbird(at) gmail.com. Greetings to iranian people and wish you the best for 2023 ;) !