How can you tell what is running?
(I think I read that the newest versions of firefox do not allow NoScript to work, which is why I haven't updated from FF 51.00.01)
If you use the Brave browser, click on the little orange lion face in the upper right corner, disable scripts, ads, cookies etc, and it will tell you what it has blocked.
I have no idea of what you can do with other browsers to protect yourself.