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I use Thunderbird verse 68.12.1.
On received messages where I mark text and then click on DeepL in the context menu, nothing happens.
When creating a message, Deepl does not appear in the context menu at all.
This addon does not work for me.

Ta opinia jest o wcześniejszej wersji dodatku (1.0.0). 

Thanks for the report. I'm not sure what causes this, but it seems to be caused by the version of Thunderbird. In that case, please restart Thunderbird once.