Review for Google Contacts by lightplane
Rated 1 out of 5 stars
Recommend that you do not use this addon. It has a bug that creates multiple copies of your contacts - I had 24,000 contacts and it took forever to delete them all. The only thing that stopped it was that I'd hit the limit for contacts on Gmail - I had many many more in Thunderbird, slowing down the program considerably.
This review is for a previous version of the add-on (0.6.40).To create your own collections, you must have a Mozilla Add-ons account.