Brilliant. Works perfectly. You just need to open your message window up and right click to customize the message window tool bar to find the button to drag and drop to the message tool bar. It took me a bit of a while to figure out where the button was hiding. Click it and it fills in your F#ck you message. If you don't like that one, cut it out and hit the button again til you get one that is just perfect. Great stress reliever with a really good friend you are annoyed with or for a business or politician you'd like to boil in oil. This is legal and relatively harmless. :-)
This review is for a previous version of the add-on (0.17.1).