wow this is great news yes, we use firefox on the POS towers and someone found a plugin that makes it full screen without a way to close the browser kiosk I think ... or ezkiosk or something I hadn't considered using a RPi for the back end side, I assumed we needed the power of a full size computer ...

We are using IS4C ( http://www.wedge.coop/is4c/ ) as our Point of Sale system at our Co-op So far we are running it on old donated tower PCs but we were thinking about maybe doing it with tiny PCs and someone mentioned the raspberry Pi ... the terminal side is a PHP site ... with very limited graphi...