Why nobody told me about policies.json when I asked this: https://support.mozilla.org/en-US/questions/1190091 ? Everything I asked is possible by creating a policies.json file. Why do you explain this to enterprises while you tell absolutely nothing to parents who wish to protect the children from harmful content on the Internet ? The usage of the file policies.json is exacly when I wanted in my post https://support.mozilla.org/en-US/questions/1190091 , including: -Disable Private Browsing -Disable the "disabling" or removal of any installed add-ons -Disable safe-mode -Disable the installation of VPN and Proxy extensions which would allow children to by-pass my DNS filtering, That's just unbelievable. You give the information to the enterprises and you tell absolutely nothing to parents! This is Wrong.