Rated 1 out of 5 stars

by Howard Cheesman on Jan. 14, 2019 ·

I know it's not your fault but this is "Incompatible with Thunderbird 60.4.0."

This review is for a previous version of the add-on (2.68). 

by Marco A.G.Pinto (Developer) on Jan. 14, 2019 ·

Hello!

It is compatible with 60.4 as it is the one I am using.

It just isn't with 65+.

And after 60.5 is released at the end of the month, Mozilla will probably convert all the remaining dictionaries to WebExtensions and 60.5 will be the minimum requirement.