I was trying to block specific websites via the "hosts" file for Windows- but Firefox would either not load any websites (with too large of a file) or it'd not block all of the websites (with a small file). However, with uBlock Origin I could have a massive blocklist and it'd work flawlessly with no slowness! 10/10. Thank you.

Fantastic ad, tracker and content blocker! Can be as plug-and-play or as advanced as you want to make it. Always the one extension I always recommend to everyone

The definitive AdBlocker. First extension I install on any browser.
Default Settings work just fine, and has plenty of customization for advanced users.