You can create multiple profiles in firefox with various level of security settings. Use noscript for unknown websites in anonymous ff profile.

https://support.mozilla.org/en-US/kb/profile-manager-create-...

https://addons.mozilla.org/en-US/firefox/addon/noscript/

I read ghacks blog frequently to keep myself up to date with new features being added in Firefox. Follow this blog and read their previous articles to learn how to stay safe in online world.

http://www.ghacks.net/

this link is also helpful to stay safe

https://www.privacytools.io/