Solve : Firefox ... how to create white list or another way to content

1.	Solve : Firefox ... how to create white list or another way to content block?
Answer» So its been quite a few years since I had to content block on a computer. I am setting up a computer for my girlfriends daughter who is 7 to do remote learning and she wants her daughter to only be able to get to 3 learning websites. I tried a couple addons and they dont block ACCESS to an adult site. Looked on GOOGLE on how to White List in Firefox and the directions they have there dont seem to apply to the latest Firefox 81.0.1 Was wondering if anyone had any suggestions on how to lock the browser down to just 3 websites and everything ELSE wont work. Maybe I need to avoid Firefox and use a different browser that has this FEATURE?This works. https://www.youtube.com/watch?v=ZDBLFbMmmbg

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