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
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.