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SPECIFICTION
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uBlock Origin

github.com

Free plan Open source Android
Visit github.com
Spec score 8.6 #12 of 48 in Ad blockers

What it is

uBlock Origin is a free, open-source content blocker for desktop and Android versions of Firefox, as well as Chromium and Thunderbird versions. It blocks ads, trackers, coin miners, popups, anti-blockers, and malware sites by default. Several filter lists are built in, and users can add lists and hosts files or create custom rules using EasyList syntax with uBlock Origin extensions. If blocking is too broad, users can disable preselected lists. The basic and advanced popup interfaces include a per-site point-and-click firewall. The project’s stated purpose is to help users neutralize privacy-invading methods in the browser, and it is described as CPU- and memory-efficient, fast, and lean. It works best on Firefox and also supports Chromium-based browsers, including Edge and Opera. In Thunderbird, it affects feeds but not email. The project advises against running it alongside another content blocker. It is licensed under GPL-3.0/GPLv3, and enterprise deployment documentation is available.

Spec sheet

Free plan
YesRead 21 Sep 2026 · github.com
Software license
The repository is licensed under GPL-3.0/GPLv3.Read 27 Sep 2026 · github.com
Billing terms
No billing schedule or paid subscription terms are stated.Read 27 Sep 2026 · github.com
Blocker compatibility
The page advises against using uBO with another content blocker.Read 27 Sep 2026 · github.com
Browser support
multiple-browsersRead 21 Sep 2026 · github.com
Content blocking
Blocks ads, trackers, coin miners, popups, anti-blockers, and malware sites by default.Read 27 Sep 2026 · github.com
Cookie popup blocking
YesRead 21 Sep 2026 · github.com
Custom filter lists
YesRead 21 Sep 2026 · github.com
Custom filters
Uses EasyList syntax and extends it for custom rules and filters.Read 27 Sep 2026 · github.com
Device coverage
desktop-and-mobileRead 21 Sep 2026 · github.com
Element picker
YesRead 21 Sep 2026 · github.com
Enterprise deployment
Enterprise deployment documentation is provided.Read 27 Sep 2026 · github.com
Filter lists
Uses several built-in lists and supports many other lists and hosts files.Read 27 Sep 2026 · github.com
Filter selection
Users can unselect preselected filter lists if uBO blocks too much.Read 27 Sep 2026 · github.com
Free tier limits
The page does not state a numeric free-tier limit.Read 27 Sep 2026 · github.com
Performance profile
Described as CPU- and memory-efficient, fast, and lean.Read 27 Sep 2026 · github.com
Platform coverage
Available for desktop and Android versions of Firefox; Chromium and Thunderbird versions are also provided.Read 27 Sep 2026 · github.com
Pricing model
Free and open-source; no paid pricing is stated.Read 27 Sep 2026 · github.com
Privacy goal
Its primary goal is helping users neutralize privacy-invading methods entering the browser.Read 27 Sep 2026 · github.com
Repository activity
The repository lists 14,307 commits, 68.2k stars, and 4.4k forks.Read 27 Sep 2026 · github.com
Support channel
Support, questions, and help are directed to the uBlockOrigin subreddit.Read 27 Sep 2026 · github.com
Supported browsers
It works best on Firefox and supports Chromium-based browsers, including Edge and Opera.Read 27 Sep 2026 · github.com
Thunderbird scope
In Thunderbird, it affects feeds but not emails.Read 27 Sep 2026 · github.com
Trial and refund
No trial or refund policy is stated.Read 27 Sep 2026 · github.com
User interfaces
Offers basic and advanced popup interfaces, including a per-site point-and-click firewall.Read 27 Sep 2026 · github.com

Plans and prices

Free Free Free open-source software; no donations sought. Read 27 Sep 2026 · github.com

Every uBlock Origin plan and price →

Strong points and limits

Strong points

  • Blocks ads, trackers, popups, and malware sites by default.
  • Supports custom filters using EasyList syntax.
  • Users can disable preselected filter lists.
  • Includes a per-site point-and-click firewall.
  • Free, open-source software licensed under GPLv3.

Limits

  • Works best on Firefox.
  • Thunderbird blocking affects feeds, not email.
  • The project advises against another content blocker.

Who it suits

uBlock Origin suits people seeking browser content blocking with control over filter lists and custom rules. It is also an option for organizations using its enterprise deployment documentation.

Verdict

uBlock Origin offers default blocking alongside editable filter lists and custom rules. Check browser fit first, and avoid pairing it with another content blocker.

Where Specifiction places it

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