Rated 3 out of 5 stars

Having success with the CardDAV protocol instead of any add-ons - does this work for everyone? Add a new address book using CardDAV protocol, then use your gmail username and this url:

https://www.googleapis.com/.well-known/carddav

Taken from this article:

https://developers.google.com/people/carddav

Ultimately found this on a comment on the blog for the gcontactsync blog