Outside, trying to get in
Using Firefox; if you use the Request Policy plugin and NoScript (of course) then you can see a list of third party content that the page is trying to pull in as well as the third party scripts.
As an example, reading an article in The Independent newspaper website right now, it tries to pull in third party content from 25 other sites and 25 scripts from those sites. I block them all and can still read the articles.
Sometimes you get a blank space in an article and that can be filled by allowing some obvious content delivery network site, if you really want to. Then of course, allowing just one third party content site gives you an entire new set of third party scripts trying to get in as well as a new set of third party content trying to get in. It's a surreal jungle out there.
I've got to the point where, if i'm keen to see stuff, I give temporary permission for all third party content but close the tab if it needs third party scripts to work.
As someone earlier mentioned, I've had sites crash my browser under Linux and they will never be visited again.