I recommend Privacy Badger, sponsored by the EFF, which is supposed to block trackers. I prefer it over Ghostery, which is backed by some company.
uBlock Origin is great for blocking Ads though. If you really need to block scripts, there's NoScript.
I recommend using at least the adblocker and the tracker blocker, even if only to reduce memory usage of the browser and take back a couple of CPU cycles from your computer stolen by pesky ads.