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

Это отзыв для предыдущей версии этого дополнения (2.68). 

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.