Privacy Badger

Automatic tracker blocker from the EFF for users and IT teams hardening browser privacy.

Privacy Badger learns which third-party domains track you across sites and blocks them, rather than relying on a curated blocklist. It sends opt-out signals, replaces some trackers with click-to-activate placeholders, and strips tracking from Google and Facebook links. It is built by the Electronic Frontier Foundation, licensed GPLv3, and free.