Interesting article on How To Geek about browser plug-ins designed for safe searching. It only mentions Norton a few times and mainly to comment on the pop-up saying not to use Edge because you can't use Norton Toolbar with it. I have no idea who is correct here and would love to see what the community thinks. Here is the article.
http://www.howtogeek.com/239950/dont-use-your-antivirus-browser-extensions-they-can-actually-make-you-less-safe/