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Doesn't work. Cannot find a button anywhere to actually open the app and insert signatures.

My version is 78.7.1

Ta opinia jest o wcześniejszej wersji dodatku (0.2.0). 

Hi, sorry for inconvenience.
Please tell me the version of your Thunderbird if you don't mind. 78.7.1 or 86.0 Beta2 ?

> My version is 78.7.1

Thanks, it is the latest Thunderbird and workable version.

"書" icon will be placed at mail compose window (press Ctrl+N).