It's FPSBanana, what can you expect?
But I think that looks more like a Kaizou/Firebug/Other real-time HTML-editor than a real hacking of FPSB.
If you look in the down-right corner, there's a firebug icon. And with firebug you can edit HTML while browsing.
So i'd say it's
FAKE.
Very easy to do stuff like this.
Here's something I quickly whipped up with Kaizou.