Hands down the best extension to ever exist related to internet browsers.
This little thing gives you the most security you can imagine while surfing the internet (other than using a VPN, which I unfortunately do not use because I don't have a job to pay the subscription fee). If you do not have this installed, you must live under a rock considering the hellhole of security issues that is the modern internet. This is extremely important to have in all of your computers' browsers along with uBlock Origin, a hosts file and a VPN. Ideally you should buy NordVPN or another well established dedicated VPN company that works for all traffic on your computer, not just browsing. If you don't know what a hosts file is, look up someonewhocares. Combining these is essential for today's PC users.