Rated 4 out of 5 stars

Useful plugin. And works well with carddav. Also has a very useful "merge contacts" feature that should be part of the default thunderbird contacts manager!

One problem is that it overwrites keyboard shortcuts of other add-ons and does not let you change them. For example: CTRL+SHIFT+N is the keyboard shortcut to open the "Quickmove" plugin. When installing Cardbook this opens the "new contact" dialog which is really annoying... I can't open Quickmove and it doesn't seem possible to change this behavior!

This review is for a previous version of the add-on (93.6).