Ublock [1] and Noscript [2] are must have. you could also checkout Privacy Badger [3].
If you use arkenfox user.js [4] you could also use I still don't care about cookies [5]
- [1] https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/
- [2] https://addons.mozilla.org/en-US/firefox/addon/noscript/
- [3] https://addons.mozilla.org/en-US/firefox/addon/privacy-badger17/
- [4] https://github.com/arkenfox/user.js/
- [5] https://addons.mozilla.org/en-US/firefox/addon/istilldontcareaboutcookies