Related issue: https://github.com/uBlockOrigin/uBOL-home/issues/326 uBOL now asks broad host permissions by default. Users can still choose narrow host permissions by using their browser's controls for this. For instance in Chromium, those host permissions controls are found in the "Site access" section in the detailed view of an extension. One can set "Site access" to "On click" to revoke broad host permissions, and grant host permissions to only specific site. In such mode, uBOL will still block through the DNR API, but no cosmetic or scriptlet filtering will occurs, as these requires permission to "read and change data" on websites for which higher filtering mode is desired. Some browsers do not automatically grant broad host permissions even when an extension asks for broad permissions at install time, and going forward all browsers will likely adopt this approach, and thus it no longer made sense for uBOL to default to no broad hosts permissions at install time, especially given this leads to issues with no solution -- issues solved with the new approach (e.g. like the ability to deploy uBOL in Optimal mode by default). |
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| .github | ||
| assets | ||
| dist | ||
| docs | ||
| platform | ||
| src | ||
| tools | ||
| .gitignore | ||
| CHANGELOG.md | ||
| CONTRIBUTING.md | ||
| eslint.config.mjs | ||
| LICENSE.txt | ||
| Makefile | ||
| MANIFESTO.md | ||
| package-lock.json | ||
| package.json | ||
| README.md | ||
| RELEASE.HEAD.md | ||
| REMOVED.md | ||
uBlock Origin (uBO)
BEWARE! uBO is (and has always been) COMPLETELY UNRELATED to the website ublock.org.

IMPORTANT: About Google Chrome's "This extension may soon no longer be supported"
uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker for Chromium and Firefox. It blocks ads, trackers, coin miners, popups, annoying anti-blockers, malware sites, etc., by default using EasyList, EasyPrivacy, Peter Lowe's Blocklist, Online Malicious URL Blocklist, and uBO filter lists. There are many other lists available to block even more. Hosts files are also supported. uBO uses the EasyList filter syntax and extends the syntax to work with custom rules and filters.
You may easily unselect any preselected filter lists if you think uBO blocks too much. For reference, Adblock Plus installs with only EasyList, ABP filters, and Acceptable Ads enabled by default.
It is important to note that using a blocker is NOT theft. Do not fall for this creepy idea. The ultimate logical consequence of blocking = theft is the criminalization of the inalienable right to privacy.
Ads, "unintrusive" or not, are just the visible portion of the privacy-invading means entering your browser when you visit most sites. uBO's primary goal is to help users neutralize these privacy-invading methods in a way that welcomes those users who do not wish to use more technical means.
Documentation
| Basic Mode | Advanced Mode |
|---|---|
| The simple popup user interface for an install-it-and-forget-it type of installation that is configured optimally by default. | The advanced popup user interface includes a point-and-click firewall that is configurable on a per-site basis. |
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Visit the Wiki for documentation.
For support, questions, or help, visit /r/uBlockOrigin.
Installation
Firefox
uBO works best on Firefox and is available for desktop and Android versions.
Thunderbird
In Thunderbird, uBlock Origin does not affect emails, just feeds.
Chromium
Microsoft Edge Add-ons (Published by: Nicole Rolls)
uBO should be compatible with any Chromium-based browser.
All Programs
Do NOT use uBO with any other content blocker. uBO performs as well as or better than most popular blockers. Other blockers can prevent uBO's privacy or anti-blocker-defusing features from working correctly.
Enterprise Deployment
Release History
Translations
Help translate uBO via Crowdin.
About
Free. Open-source. For users by users. No donations sought.
If you ever want to contribute something, think about the people working hard to maintain the filter lists you are using, which are available to use by all for free.





