Review for CardBook by dw
Rated 5 out of 5 stars
I've only used this for a couple of days; but so far I'm very impressed. A big improvement over the tried-and-true but no-longer-supported gContactSync. Very easy to use.
Most importantly, I ran into a very isolated bug when importing one of my Google address books. The author spent most of his Saturday diagnosing and solving the problem. VERY impressive support.
To create your own collections, you must have a Mozilla Add-ons account.