Chromium browser fresh start, Raspberry Pi

sqlite3 must be installed:

sudo apt-get install sqlite3 -y

Set chromium to boot at startup for current user (pi):

nano ~/.config/openbox/autostart

Set chromium to boot at startup for all new users:

sudo mkdir -p /etc/skel/.config/openbox
sudo nano /etc/skel/.config/openbox/autostart

Enter content:

#!/bin/sh
rm -rf ~/.cache/chromium
rm -rf ~/.config/chromium
rm -rf ~/.pki
mkdir -p ~/.config/chromium/Default
sqlite3 ~/.config/chromium/Default/Web\ Data "CREATE TABLE meta(key LONGVARCHAR NOT NULL UNIQUE PRIMARY KEY, value LONGVARCHAR); INSERT INTO meta VALUES('version','46'); CREATE TABLE keywords (foo INTEGER);";
chromium-browser --disable-plugins --kiosk --incognito https://catonrug.blogspot.com/2016/05/windows-update-slipstream-cheat-sheet.html

Set it executable for current user:

chmod +x ~/.config/openbox/autostart

Set it executable for future users:

sudo chmod 755 /etc/skel/.config/openbox