It's somewhat automatic, but definitely not cost-free. Spend awhile with uBlock Origin and optionally something like PiHole, and you'll be amazed at how much less exhausting reading online is.
I read web content via all sorts of apps that aren’t web browsers (mail, rss reader, various electron junk, not to mention mobile apps that are simply skins over web pages). A browser plug-in doesn’t help for those cases.
uBlock Origin catches almost all of it, but PiHole catches the rest. Also great for devices which cannot run an ad-blocker. (Mobile apps, smart TVs, etc)