Review for gContactSync by Craig100
Rated 5 out of 5 stars
gContanctSync has been an integral part of my Thunderbird life for years. Now it's stopped working and I'm devastated. Thunderbird also removed colour from the folders, so colour cues now missing :( Hope gContactSync gets fixed really soon or I'll have to switch email clients.
To create your own collections, you must have a Mozilla Add-ons account.