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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

这个评论是针对附加组件的一个早期版本的(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).