Prevent a User from Seeing Inappropriate Web Content
The web includes sites containing almost every known depravity, so it is a good idea to use the Web options in Parental Controls to restrict the websites that the user can access when browsing.
You can set the Web options to either try to limit access to adult websites or allow the user to access only a list of websites that you approve. This limiting of access works only for Safari, not for any other browsers you may install on your Mac mini, so you must make Safari the only web browser the user is allowed to run, as described in the previous section.
Prevent a User from Seeing Inappropriate Web Content
In the Users & Groups preferences pane, click the user account you want to change. ...
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