Review for Contacts Sidebar by jkbsy
Rated 5 out of 5 stars
Since July 20, 2010 a new pre-release is available : 0.8pre2 !
Everything is there :
http://jpeters.no-ip.com/extensions/index.php?page=tb_cs_prerelease
To create your own collections, you must have a Mozilla Add-ons account.