uBlock Origin is a free, open-source browser extension designed to block ads, pop-ups, and trackers. It is widely used as a utility tool when browsing ad-heavy adult sites and installs in seconds from uBlockOrigin.com. Compatible with Chrome, Firefox, Microsoft Edge, Opera, and Chromium. The extension relies on community-maintained block lists to filter known ad-serving domains and is noted for being CPU and memory efficient. It is not compatible with current versions of Safari. While it cannot block 100% of intrusive content on all sites, independent testing confirms it substantially reduces ad interruptions on typical tube sites. The project refuses direct donations and is maintained entirely by volunteers.