Rated 4 out of 5 stars

per Scuttle@IL el des. 30, 2021 ·

Excellent addon. An improvement would be if one click the attachment and have it open with the default app.

Or am I missing that?

This review is for a previous version of the add-on (2.1.0). 

per opto (desenvolupador) a gen. 1, 2022 ·

What you request is actually the default action which TB offers if you click the filename in the attachment list.

The idea of this addon is to give a quick overview of the document, without having to wait for the default app to open (nor having to close the default app afterwards).