If you have created a non-root user in FatDog and you are logged into the desktop as this user, your browser (for instance Chrome) will be executed as that non-root user.
If you are logged in as root, the default behaviour is that your browser is executed as spot:
https://distro.ibiblio.org/fatdog/web/faqs/spot.html
Is there a way to run browsers as spot while being logged in as your non-root user?