All you need if you wanna use a Chrome Extension as your main app on Raspberry Pi. With these settings, RPI will start clean with a Chrome app in fullscreen

Raspberry Pi autostart.md

Autostart Apps in Chrome

• sudo apt-get update
• Open the local copy in /usr/share/applications (drag it over an open nano sudo nano ~/.local/share/applications/chromium-browser.desktop)
• look for the first line, starting with Exec=. Replace the line by (in the case of "YOURNAME"):

Exec=chromium-browser --profile-directory="Default" %u

• add mouse hide software sudo apt-get install unclutter
• edit autostart file sudo nano /etc/xdg/lxsession/LXDE-pi/autostart:

#!/bin/bash

### Chromium Startverzoegerung
sleep 15

### Bildschirmschoner deaktivieren
#@xscreensaver -no-splash  
@xset s 0 0
@xset s off         # don't activate screensaver
@xset -dpms         # disable DPMS (Energy Star) features.
@xset s noblank     # don't blank the video device

Mauszeiger ausblenden

@unclutter

lädt Chromium im Vollbild bei einem Neustart

for a specific webpage

@/usr/bin/chromium-browser --incognito --kiosk --ignore-certificate-errors --disable-restore-session-state --ignore-certificate-errors https://www.google.com 

# for a specific App (example for AppSpace / Signage)
# found your app id in /~/.config/chromium/Default/Extensions

@/usr/bin/chromium-browser --enable-extension-apps --enable-extensions --enable-apps --app-id=gmdgbdlpbnhiogedlhmdiceocbgcbpgi `

to make everything blank on startup

• sudo nano /boot/cmdline.txt

• Replace console=tty1 with console=tty3 to redirect boot messages to the third console?

• Add logo.nologo to hide Raspberry logo

• Add quiet splash for a non-text load screen.

• If you wanna start via terminal: /usr/bin/chromium-browser --profile-directory=Default --app-id=gmdgbdlpbnhiogedlhmdiceocbgcbpgi (example for AppSpace)

Exit Kiosk mode

alt+f4 ctrl+w F11