Review for gContactSync by GhostLyrics
Rated 4 out of 5 stars
This is THE addon for any google user who likes to have his contacts in sync while being offline.
The ability to carry his google addressbook around is a feature I've been looking for and this was the right tool to achieve this. I'm just waiting for the birthday data to be synchronized and then it's propably literally perfect.
To create your own collections, you must have a Mozilla Add-ons account.