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uBlock Origin

Free, open-source, low-overhead content blocker for ads, trackers and malware sites, best on Firefox.

Open sourceAd and tracker blockers
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About uBlock Origin

uBlock Origin is the content blocker most power users recommend. It blocks ads, trackers, coin miners, pop-ups, anti-adblock scripts and malicious sites using EasyList, EasyPrivacy and its own filter lists, and it is known for using little CPU and memory. Beginners can install it and forget it; advanced users get element pickers, custom filters, per-site switches and a dynamic filtering mode that works like a firewall for scripts and frames. It is completely free, GPLv3-licensed, developed by volunteers, and does not seek donations or run an acceptable-ads programme. The big change is Manifest V3: Chrome removed the classic version from its web store in August 2026 and Edge is phasing it out, so on Chromium browsers most people now use uBO Lite instead. Full uBlock Origin remains available and works best on Firefox, including Firefox for Android.

Best for: Firefox users who want the most capable, lightweight browser blocker available.

Pros and cons

What works

  • Very efficient on CPU and memory
  • Deep controls: custom filters, element picker, dynamic filtering
  • No acceptable-ads programme, no donations sought

Why people leave

  • Removed from the Chrome Web Store; Chromium support is ending
  • Advanced mode is easy to misconfigure
  • Browser-only, so it can't block ads inside apps

Top uBlock Origin alternatives

See all 5
  1. 1uBlock Origin Lite logo
    uBlock Origin Lite

    The same team's Manifest V3 version, the practical choice on Chrome and Edge now.

    66.5
  2. 2AdGuard logo
    AdGuard

    Paid desktop app that filters ads in every browser and app, unaffected by Manifest V3.

    62.6
  3. 3Ghostery logo
    Ghostery

    Open-source blocker that still offers full features on Chrome with automatic cookie-banner rejection.

    59.6
  4. 4NextDNS logo
    NextDNS

    Blocks ads and trackers at DNS level across every device, without an extension.

    57.2
  5. 5Privacy Badger logo
    Privacy Badger

    Lighter, automatic tracker blocker from the EFF that needs no configuration.

    55.3

Why people left uBlock Origin

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

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uBlock Origin: common questions

Is uBlock Origin free?

Yes. uBlock Origin is free, open-source software.

Is uBlock Origin open source?

Yes. The source code is on GitHub at gorhill/uBlock.

What platforms does uBlock Origin run on?

uBlock Origin is available for Browser extension and Android.

What are the best alternatives to uBlock Origin?

The highest-ranked uBlock Origin alternatives right now are uBlock Origin Lite, AdGuard and Ghostery. See the full ranked list for pricing, platforms and verified facts.

See all 5 uBlock Origin alternatives