Review for Google Contacts by Gary Aitcheson
Rated 5 out of 5 stars
Looks good so far. The GMail address book appears exactly like the normal thunderbird address book. It's what I was looking for to complete the set (with lightning and provider) for complete access to GMail and Google Calendar.
This review is for a previous version of the add-on (0.1.30).To create your own collections, you must have a Mozilla Add-ons account.