http://raspberrypi.stackexchange.com/questions/30093/epiphany-browser-in-full-screen-mode
Create a file startB in your home directory /home/pi/ with following content sudo nano ./startB
#!/bin/sh
xset -dpms # disable DPMS (Energy Star) features.
xset s off # disable screen saver
xset s noblank # don't blank the video device
matchbox-window-manager -use_titlebar no &
WEBKIT_DISABLE_TBS=1 epiphany-browser -a --profile /home/pi/.config http://sitenow sudo nano /etc/rc.local and put in the following line before exit 0
sudo xinit ./home/pi/startB &and Raspberry Pi will boot up in kiosk mode with browser.