I work at an I.T. place and it is a weekly occurrence for individuals to bring in their computers claiming they have malware because they got redirected to an adware or malicious webpage.

I've never once encountered such an issue myself. Part of it is just making smart choices online (I.e. Perhaps don't click that random ad... Or go to that sketchy website..) and part of it is using this extension.

10/10 I recommend. Plus it's free!