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/

I think you can use their bookmarklet, but personally I don't see any benefits as somewhat similar Google Safe Browsing service is internally used by all major browsers.

it was decently accurate at judging whether a random website contained "legal" downloads of books

Yeah, it is true that WOT is useful for some rare use cases, where it is important whether some unknown website is a scam or not, but I don't think I need it for casual browsing.

Replace it with common sense.