What is uBlock Origin?
uBlock Origin is a browser extension that blocks ads, trackers, coin miners, popups and malware sites using predefined filter lists. Its default configuration includes EasyList, EasyPrivacy, Peter Lowe's Blocklist, Online Malicious URL Blocklist and the project's own filters. Users can disable selected lists or add others, including hosts files.
The basic popup interface provides controls for everyday browsing, while advanced mode adds a point-and-click firewall configurable per site. Custom rules and filters use EasyList syntax with additional extensions. The documentation also covers a request logger, DOM inspector, element picker and cosmetic filtering.
Installation is available through supported browser add-on stores or manually from release packages. The project identifies Firefox as its preferred browser and supports Firefox on desktop and Android. Chromium deployment depends on continued Manifest V2 support; manually installed Chromium and Thunderbird packages usually do not update automatically. In Thunderbird, filtering applies to feeds rather than email.
uBlock Origin screenshots
Explore the interface. Open a screenshot to view it at full size.
Source: official uBlock Origin project page.
Key capabilities
- Content blocking Filters ads, trackers, coin miners, popups, anti-blockers and malware sites through predefined lists.
- Filter customization Supports additional filter lists, hosts files and custom filters using extended EasyList syntax.
- Per-site controls Provides a basic popup interface and an advanced point-and-click filtering firewall.
- Cosmetic filtering Includes an element picker, element zapper and procedural cosmetic filters for page content.
- Diagnostics Provides a request logger and DOM inspector to investigate filtering behavior.
Where uBlock Origin fits
uBlock Origin fits individual browsing setups that need default content blocking with optional site-specific adjustments. System administrators can also consult its enterprise deployment documentation when distributing the extension across managed browsers.
Before deployment, browser support for Manifest V2, required permissions, installation channels and update behavior need verification. Selected filter lists and custom rules should be tested against required sites. The project advises against running uBlock Origin alongside another content blocker because this can interfere with privacy and anti-blocker handling.
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Alternatives to uBlock Origin
Browser OperatorBSD-licensed AI browser for macOS and Windows: an AI Chat panel runs search and research agents, remembers context, connects to OpenRouter, OpenAI, Groq or local models through LiteLLM, and has an HTTP agent server.
Flow BrowserGPL-3.0 desktop browser from Multibox Labs for Windows, macOS and Linux. It runs on a Widevine-enabled Electron build and adds spaces, profiles, a command palette, a built-in ad blocker and Chrome extension support. Still in beta.