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Does work well in Firefox but not in Thunderbird. Extension is installed. I see a LanguageTool-Button in every E-Mail window next to the Attachments-Button, where I can access the Settings for LanguageTool. But it does not mark any errors in the text, does nothing

Thunderbird 102.7.0 on Windows 10
LanguageTool 6.0.5

@Christopher Blum: I've tried that already. I have just one other add-on (Provider for Google Calendar) and deactivation does not solve the problem. You can find a screenshot here:
postimg.cc/2bzPDTDw

Questa recensione riguarda una versione precedente (6.0.5) del componente aggiuntivo. 

Hi, we are not aware of any such issue. Would you mind checking if this happens in combination with any of your other add-ons (by disabling them one by one)?