Thunderbird Extention Easter Egg!?

I had recieved an e-mail from one of my aunts and was suprised to find this, Displayed the the Thunderbird extention that displays the Mail User-Agent (aptly titled "Display Mail User Agent Extention"). Take a look at the Image below, and go ponder what kind of person the person who wrote the extention was... Note that you really need to click on it to read what it says.