If there's an add-on I can't do without, it's uBlock Origin. Fantastic devs and progress over time, I'm using it for almost a decade now.

6xStars_needed!

Probably the most comprehensive security add-on for browsers other than a couple of the VPN extensions. Confusing as all get out to understand and get set up for the average user, but even the default settings are much better than most of its competitors.

Really efficient ad blocker, best one out there.

The best ad block there is

The best!