To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for CardBook by Erik O.
Rated 5 out of 5 stars
While not yet perfect, I give this 5 stars as it is awesome. It installs fast, integrates into TB quite nicely and supports custom fields from contact lists in ownCloud.
Its definitely worth using and IMO the best cardDAV client out there for TB.
To create your own collections, you must have a Mozilla Add-ons account.