uMatrix defaults to blocking nearly everything from third parties. Most sites do not work 100% properly; many 'simple' sites will not even render because of how common it is to outsource content delivery to cloudflare et al.

It's painful, but it's (for me) the only sane way to browse. I'm willing to trade a few seconds of determining what 3rd party sources I'm going to allow when visiting a new site in exchange for minimizing tracking and malicious ads.