Rated 5 out of 5 stars

yazan: gldlg tarih: Eki. 18, 2018 ·

Must have.
Please make it work with TB 60! Please!... ;)

This review is for a previous version of the add-on (3.0.0). 

yazan: Josh Geenen (Geliştirici) tarih: Ara. 4, 2018 ·

This add-on does not work properly in TB 60.0 and later. I'm tracking my progress towards supporting 63+ in https://github.com/jdgeenen/gcontactsync/issues/121. Thunderbird's rate of making breaking changes has outpaced my spare time, so your patience is appreciated.