Rated 5 out of 5 stars

Will miss it; any chance of updating for TB v60+?

https://wiki.mozilla.org/Thunderbird/Add-ons_Guide_57

Léirmheas ar leagan níos sine den bhreiseán seo (0.3.7).  Rinne an t-úsáideoir seo léirmheas ar an mbreiseán seo cheana.

There's a new version coming up which just adds support for tb 60+. It's awaiting review by the Thunderbird dev team.