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uBlock Origin

Privacy & security tools / big-tech alternativesTracker & Ad BlockersPrivacy Browsers & Extensions
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Verified working Aug 3, 2026

An open-source blocker for ads, trackers, and malicious domains.

uBlock Origin is a free, open-source browser extension for filtering ads, trackers, and known malicious domains with an emphasis on low resource use. The site explains where the full extension still works, how Chrome’s Manifest V3 changes affected it, and when users need the reduced uBlock Origin Lite version instead.

Why it stands out

  • Maintained as an open-source project rather than an ad-funded blocking product
  • Broad filtering scope covers more than display ads, including trackers and malicious domains
  • Clear distinction between the full extension and the Manifest V3-limited Lite version
  • Still offers full functionality on Firefox and Brave while many Chromium blockers are constrained

Good to know

  • The full extension is no longer available for Chrome; Chrome users are directed to uBlock Origin Lite.
  • uBlock Origin Lite has reduced capabilities, including limits around filter lists, cosmetic filtering, scriptlet injection, and dynamic filtering.
  • Safari support ended after version 13.
  • Browser support can change, especially for Chromium-based browsers affected by extension-platform policy changes.

Photos

Illustration for uBlock Origin