I have a brother with special needs and he is always on the computer. We dont have a network in my house just individual computers on a wireless router. He uses windows xp. He recently found youtube which should be fine, he watches old cartoons and disney shows and the likes. He now has started to click the side bars and is watching some of youtubes "better" content of sesame street getting shot up or stripper girls. I tried blocking it by using this link http://www.firefoxanswer.com/firefox/93-firefox-2.html but he has it back now. What is the easiest way to block youtube all together?