Review for Contacts Sidebar by Anmacopu
Rated 4 out of 5 stars
http://extensions.sanjer.nl/index.php?page=tb_cs_prerelease
Version: 0.9pre
I used Massic80 method to install and works fine with new Thunderbird 6.0!!: open with WinRar / Winzip and changes "install.rfd" with notepad: search text "5.9*" and replace with "6.* "
To create your own collections, you must have a Mozilla Add-ons account.