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uBlock Origin (uBO) is not an "ad blocker". It is a wide-spectrum content blocker with CPU and memory efficiency as primary features.
Out of the box, uBO blocks ads, trackers, coin miners, popups, etc. through the following lists of filters, enabled by default:
- EasyList (ads)
- EasyPrivacy (tracking)
- Peter Lowe’s Ad server list (ads and tracking)
- Online Malicious URL Blocklist
- uBO's lists
More lists are available for you to select if you wish:
- EasyList Cookie
- Fanboy Annoyances
- AdGuard Annoyances
- Dan Pollock’s hosts file
- And many others
Additionally, you can point-and-click to block JavaScript locally or globally, create your own global or local rules to override entries from filter lists and many more advanced features.
Free.
Open-source with public license (GPLv3)
For users by users.
If ever you do want to contribute something, think about the people working hard to maintain the filter lists you are using, which were made available to use by all for free.
- Documentation: https://github.com/gorhill/uBlock#ublock-origin
- Release notes: https://github.com/gorhill/uBlock/releases
- Community support @ Reddit: https://www.reddit.com/r/uBlockOrigin/
- Contributors @ GitHub: https://github.com/gorhill/uBlock/graphs/contributors
- Contributors @ Crowdin: https://crowdin.com/project/ublock
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- Wiki home
- About the Wiki documentation
- Permissions
- Privacy policy
- Info:
- The toolbar icon
- The popup user interface
- The context menu
- Dashboard
- Settings pane
- Filter lists pane
- My filters pane
- My rules pane
- Trusted sites pane
- Keyboard shortcuts
- The logger
- Element picker
- Element zapper
- Blocking mode
- Very easy mode
- Easy mode (default)
- Medium mode (optimal for advanced users)
- Hard mode
- Nightmare mode
- Strict blocking
- Few words about re-design of uBO's user interface
- Reference answers to various topics seen in the wild
- Overview of uBlock's network filtering engine
- Overview of uBlock's network filtering engine: details
- Does uBlock Origin block ads or just hide them?
- Doesn't uBlock Origin add overhead to page load?
- About "Why uBlock Origin works so much better than Pi‑hole does?"
- uBlock's blocking and protection effectiveness:
- uBlock's resource usage and efficiency:
- Memory footprint: what happens inside uBlock after installation
- uBlock vs. ABP: efficiency compared
- Counterpoint: Who cares about efficiency, I have 8 GB RAM and|or a quad core CPU
- Debunking "uBlock Origin is less efficient than Adguard" claims
- Myth: uBlock consumes over 80MB
- Myth: uBlock is just slightly less resource intensive than Adblock Plus
- Myth: uBlock consumes several or several dozen GB of RAM
- Various videos showing side by side comparison of the load speed of complex sites
- Own memory usage: benchmarks over time
- Contributed memory usage: benchmarks over time
- Can uBO crash a browser?
- Tools, tests
- Deploying uBlock Origin
- Proposal for integration/unit testing
- uBlock Origin Core (Node.js):
- Troubleshooting:
- Good external guides:
- Scientific papers
uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.