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I have the latest thunderbird which is 17.03
However this add-on expects 19+ and won't install.

Where does v19 come from?????

这个评论是针对附加组件的一个早期版本的(3.0.1-signed)。 

I forgot that Thunderbird versions don't actually get released once they leave the beta channel, like they used to. I've now had a chance to check Shrunked against TB 17 and everything is fine, so the compatibility has been changed.