Rated 3 out of 5 stars

It's clear that a lot of work was spent by the developer, putting sheer attention to details, delivering a product which looks professional and complete.

However, there's no documentation at all.
There are no videos on YouTube or Vimeo about this extension.

Anyone first arriving to the product will be confused by so many things to configure and/or tweek... and will only see an empty list of contacts, which is something absolutely useless.

Ideally, the extension should infer some useful CardDAV servers, from the email accounts I have configured. So, if I have a gmail account, chances are that I have contacts there... and the extension should try to access them.

As I said: the extension looks great and extremely professional. However, after 15 minutes spent with it, visiting forums and trying to find documentation... nothing happened. And I simply uninstalled it.

This review is for a previous version of the add-on (26.0). 

Hi

you're completely right : documentation is one of my next priority... after having been installed CardBook proposes to import your contacts from the Thunderbird standard address books and it's a very good idea to also propose to download contacts corresponding to your email address ;O)