uBlock Origin
FreeA fast, memory-light blocker for ads and trackers — install and breathe
Open Source No Ads No Tracking No Sign-up Cross-platform
A wide-spectrum content-blocking browser extension that stops ads, trackers, cryptominers and malware sites by default, and is extremely light on resources. The full version runs on Firefox and Firefox-based browsers; since Chrome's Manifest V3 migration, Chrome can only install the feature-limited uBlock Origin Lite.