Rated 4 out of 5 stars
I wish Contacts Sidebar was part of Thunderbird or Jeroen had more time to make compatible version with every new release of TB. Contacts Sidebar 1.3pre is not compatible with Thunderbird 9.0.1. :-/ I'll make a donation if it is functional.
Rated 5 out of 5 stars
I really miss this add-on in TB 3. I have to wait till January.