Rated 5 out of 5 stars

It performs great! It is a very useful application. It fills the gap of IMAP standard not dealing with address lists. With the help of this program my contacts on my work and home computer plus my cell phone are always synchronized. (Before I had to it do manually by exporting/importing ldif files.) The differences in field contents of Thunderbird and on Google accounts are managed carefully. The only slight problem to me that the "display name" field that according Thunderbird sorts to is generated automatically in order <first name><last name>. If a next version may contain an option for the reverse order would be great.
Five stars plus one.

This review is for a previous version of the add-on (0.6.40).