Oceniono na 5 z 5 możliwych gwiazdek

Great add-on!

Suggestion: would it be possible to keep the html formatting for printing only?

Ta opinia jest o wcześniejszej wersji dodatku (5.6). 

Absolutely no chance - sorry.

Invoking the print function reloads the message. So the add-on would need an "listener" "behind" this moment. But there is no "listener", which I could use to do this.