Works as described. Rated 5 out of 5 stars
Fantastic extension; works perfectly. Thanks for the great add-on Phil, your work is very much appreciated.
UPDATE: Just had to manually update from 17 to 18. Not sure why, but in any case it works great again.
Please doublecheck, the main page says "Works with Thunderbird 16.0 - 16.*" for Lightning 1.8. Maybe the in-app update is not working correctly?