Rated 3 out of 5 stars

3 stars for developer's valuable efforts.

Going through steps given by developer it does work on TB 68.5.0 (32-Bit) Win7.

From TB 68 the start is mandatory:
1. hamburger menu
2. add-ons
3. click on TabAddressbook

Nevertheless, it could get a bit nicer.
It would be very good to have a button (icon) at the top bar, to switch tab on/off more easy.

Many thanks!