Because of new permission: https://www.ghacks.net/2019/11/20/ublock-origin-for-firefox-addresses-new-first-party-tracking-method/

Bellissimo!

Very good add-on that is great for my use. I don't really want to block all ads, just abusive ones and ones that I think are just fake or irrelevant for the webpage/article that I am currently reading. Highly customizable to your needs and I wouldn't really surf the web without it.