Rated 5 out of 5 stars

Great addon until ver 55.5. All address books disappeared. Restored Thunderbird. Installed ver 55.6 with same nasty results. Again, restored Tbird. Last working version is 55.2.

Update: Restarting Tbird did the trick. Thanks for the quick response.

This review is for a previous version of the add-on (55.6).  This user has a previous review of this add-on.

workaround here : https://gitlab.com/CardBook/CardBook/-/issues/1172#note_512218318