It tends to be good for security. For example, it blocks a great many XSS attacks, as if every website had a strict content-security-policy header. Or if some

It tends to be good for security. For example, it blocks a great many XSS attacks, as if every website had a strict content-security-policy header. Or if some joker on a website adds <img src="http://192.168.0.1/reboot-router.php http://192.168.0.1/reboot-router.php"> or suchlike you're protected. Websites that want to host sketchy untrusted content use iframes to external domains, so the sketchy content can't grab the user's cookies. If the website didn't trust the third party, why should you? It can also block a variety of "features" that are actually annoyances - like third-party live chat popups, third-party cookie consent nag screens etc. In terms of the price, how troublesome it is will depend on your web browsing needs. If you're a professional buyer visiting dozens of different companies' websites every day, you might find it inconvenient. But if most of your time is divided between your 10 favourite websites? Once you've got the whitelist right you'll barely notice it.