The best ad-blocker there is, and a genuine necessity to browse the web. Thankfully, Firefox will keep supporting it even after it gets broken on Chrome by Google's Manifest v3 changes in 2023.

Tip: Check out the filter settings! Right out of the box, you can turn on filters to block cookie alerts and social sign-ins, and there are a lot more filters available online as well.

Just one extension to block ads and trackers but also automatically hide cookie banners, very useful.