Windows 10: how do I really block certain websites?

Apparently, Windows 10 does not honor the hosts file, so I'm a bit confused as to how to block access to certain sites (specifically, I want to block YouTube on the computer that kids are using for online school classes, but the question is general, not about the specific site).

From my previous experience, I simply added a line to the hosts file "127.0.0.1 youtube.com", but it appears that this has no effect on whether youtube can be reached by either Firefox or Opera (the latter was recently discovered by the kids as having a "cool" gaming skin).

Another possibility is to block the site using the firewall (ESET in my case). But I'm confused as why won't the host file be enough. Any ideas?

:)

 

How to Block Websites

I have googled a bit and found software that can be used to block websites on a computer. I also found another way by using Windows which I would prefer. My problem is I must be doing something wrong. Here is the site that has the steps.
How to block websites | PCWorld

Here is what happens when I perform step 6. I am the administrator by the way.





Any ideas on how to make this work?

 

How to Block Websites

Sorry everyone but I have done everything suggested and it still does not block the website.

 

Redirect certain webpages to kittens

Don't know about the kitten thing, but I do know that blocking "all NSFW" websites is gonna require a service/software that is updated regularly. This can either be done with software or with a router that supports such a feature, since the list of NSFW websites is constantly changing. Suggest you start with the option for family friendly surfing that is included as part of Windows Live Essentials.