For really annoying pages i have to allow two or three other domains, and theres an element of guesswork unvolved in figuring out which scripts are relevant to the page loading or not. Thats only on the first time you visit that site. But on the sites where you want it most, id vastly prefer refreshing 2 or max 3 times allowing gradually additional scripts each time, than just letting them call whatever the fuck they want from whatever domain. Every time that happens i end up allowing 2 or 3 urls, and sometimes there's about 40 that i dont recognize or actively don't want.