Is it possible to block access to Safari's extensions? I'd like my son to have access to Safari but not to the extensions, as these provide content blockers to innapropriate material. Is there a way to do this?

Thanks
Instead of blocking Safari Preferences you can turn on Parental Controls to restrict precisely time slots or what site content should be blocked.


Open System Preferences
Choose Parental Control
Create a new user account with the restrictions you want for your son