How to block porn ads so my kids couldn't see them

[Balsactur]

Hello. Yesterday I let my 8 years old kid play some games on miniclips and went making dinner. After 10 minutes I came back to check how he was doing and saw a naked breast picture on the screen. Some inappropriate add came out in front of my kid eyes. I was shocked how unsafe internet is for small kids so after that I started looking for a solution, how to block all that ugly stuff. I came across https://familyfriendlydns.com/, which is free to use and assures safety browsing for kids (this is not a promotion, just friendly advice for all parents who have the same concerns about internet safety as I do). The problem is that I can only install it on my windows and I need the same protection for my mac. Could someone suggest me anythinglike this for mac?