[LupinSansei]

Hi, I'm using this to launch Firefox so I can use Youtube in TV mode. Is there a way to launch a site in Firefox and in fullscreen?

Have a look at the Firefox command line parameters. I recommend you create a LNK file to make your tests (you can change the launch arguments of the LNK file and try) and once you have what you want create a Standalone Launcher in AEL copying the arguments of the LNK file. 

Thanks! I ended up using Chrome but created a LNK like you suggested. It worked great thanks! For Youtube TV interface the argumenets I used for Chrome was --kiosk youtube.com/tv if anyone needed help with it or any other site.