Review for Google Contacts by colinwoodmark
Rated 3 out of 5 stars
zindus is better than Google Contacts for one BIG reason - it doesn't lose any changes.
To test:
1. take Thunderbird offline (status bar bottom left)
2. modify contact(s)
3. go online
zindus: changes are preserved and sync with Google
Google Contacts: changes are silently lost!
Change sync mode to Batch mode.
To create your own collections, you must have a Mozilla Add-ons account.