Start a program in Openbox startup, Raspberry Pi

To start a program in openbox startup you have to create absolute new file at user profile:

nano ~/.config/openbox/autostart

Set the content like:

#!/bin/sh
chromium --kiosk --incognito www.catonrug.net/p/raspberry-pi.html

Set the file executable:

sudo chmod +x ~/.config/openbox/autostart

If you want to work this solution for all the new users in future you need to create new config file for new user profile:

Create necessary directory structure:

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

Create new file:

sudo nano /etc/skel/.config/openbox/autostart

Set what to do:

#!/bin/sh
chromium --kiosk --incognito www.catonrug.net/p/raspberry-pi.html

Set this file executable for all users:

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

Now when you create new user the startup script will be automatically added from /etc/skel

pi@raspberrypi ~ $ sudo adduser ben
Adding user `ben' ...
Adding new group `ben' (1014) ...
Adding new user `ben' (1013) with group `ben' ...
Creating home directory `/home/ben' ...
Copying files from `/etc/skel' ...
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
Changing the user information for ben
Enter the new value, or press ENTER for the default
        Full Name []:
        Room Number []:
        Work Phone []:
        Home Phone []:
        Other []:
Is the information correct? [Y/n] y