Rated 4 out of 5 stars

per GiPiero el jun. 8, 2009 · enllaç permanent

Absolutely necessary addon.
I think it misses 2 important features: -
1) possibility to place it not only under folder's panel but at its right (or left) too. -
2) add in the dropdown menu that allows to select one of the available adress books, the voice "all contacts" that shows all the contacts from all address books.