Review for SyncKolab by ieales
Rated 2 out of 5 stars
Used with great success on TB 2, 4 stars.
Use on TB 3 is very problematic for Contacts. Issues could be related to O/S / IMAP Server / TB3. Back up Address Books before use.
Seems to work well for Calendar
To create your own collections, you must have a Mozilla Add-ons account.