Rated 5 out of 5 stars

per Paul el gen. 17, 2019 ·

@Peter Landstreet

Go to the Add-ons page in Thunderbird. Click on the "gear wheel" icon at the the top of the page and select "Install Add-on from file...".

Hopefully it's straight forward from there.

This review is for a previous version of the add-on (2.1.6.6).