Active on over 100 million devices worldwide, Adblock Plus is definitely one of the most popular ad blockers available, and with good reason- they're really good. Available for virtually any browser you can imagine, they block ads, trackers, and malware. By default, Adblock Plus allows some ads into the browser, but this can be turned off for increased privacy. Being free and open source, they're a great solution for anyone new to browser content blockers.
SKILL LEVEL: BEGINNER
Firefox, Chrome, Safari, Opera, Edge, Internet Explorer
Adblock Plus offers whitelists, filters, and different levels of privacy vigilance, but is fairly basic overall.
This is mostly a "set it and forget it" plugin.. Until it breaks a site you need to see. Thankfully, this is rare.
It's nothing to write home about, but it gets the job done.