Rated 2 out of 5 stars

The addon seems to bring TB really a little bit closer to CardDav and co applications. But after I try it some weeks, Thunderbird becomes slower and slower how long the add on is activated. Every Mail which we are choosing needs 5s to open and close... The "name" solution in the TB properties didn't work... it is a petty

This review is for a previous version of the add-on (21.8). 

In CardBook preferences, first tab, check “Unique source for contacts”, if this is not enough, in Thunderbird preferences, Display tab, then Advanced tab, uncheck “Show only display name for people in my address book”.