<sub><ahref="https://github.com/gorhill/uBlock/wiki/uBlock-Origin-is-completely-unrelated-to-the-web-site-ublock.org"><b>BEWARE!</b> uBO is (and has always been) COMPLETELY UNRELATED to the website <code>ublock.org</code></a>.</sub>
<ahref="https://addons.mozilla.org/addon/ublock-origin/"><imgsrc="https://user-images.githubusercontent.com/585534/107280546-7b9b2a00-6a26-11eb-8f9f-f95932f4bfec.png"alt="Get uBlock Origin for Firefox"></a>
<ahref="https://chrome.google.com/webstore/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm"><imgsrc="https://user-images.githubusercontent.com/585534/107280622-91a8ea80-6a26-11eb-8d07-77c548b28665.png"alt="Get uBlock Origin for Chromium"></a>
<ahref="https://microsoftedge.microsoft.com/addons/detail/ublock-origin/odfafepnkmbhccpbejgmiehpchacaeak"><imgsrc="https://user-images.githubusercontent.com/585534/107280673-a5ece780-6a26-11eb-9cc7-9fa9f9f81180.png"alt="Get uBlock Origin for Microsoft Edge"></a>
<ahref="https://addons.opera.com/extensions/details/ublock/"><imgsrc="https://user-images.githubusercontent.com/585534/107280692-ac7b5f00-6a26-11eb-85c7-088926504452.png"alt="Get uBlock Origin for Opera"></a>
uBlock Origin (uBO) is a CPU and memory-efficient [wide-spectrum content blocker][Blocking] for Chromium and Firefox. It blocks ads, trackers, coin miners, popups, annoying anti-blockers, malware sites, etc., by default after installation using [EasyList][EasyList], [EasyPrivacy][EasyPrivacy], [Peter Lowe's Blocklist][Peter Lowe's Blocklist], [Online Malicious URL Blocklist][Malicious Blocklist], and uBO [filter lists][uBO Filters]. There are many other lists available to block even more. Hosts files are also supported.
After installation, 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.
uBO uses the EasyList filter syntax and [extends][Extended Syntax] the syntax to work with custom rules and filters. Also, uBO has an advanced mode that allows it to work in [default-deny mode][Default Deny]. This mode will cause [all 3rd-party network requests][3rd Party Requests] to be blocked by default unless allowed by the user.
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, involved means (such as [uMatrix]).
[Popup user interface]|[A point-and-click firewall that is configurable on a per-site basis][Dynamic Filters]
<ahref="https://github.com/gorhill/uBlock/wiki/Quick-guide:-popup-user-interface"><imgsrc="https://user-images.githubusercontent.com/585534/84045360-b10ee580-a976-11ea-9e91-29c2107b47c2.png"/></a><br><sup>.<br>.</sup>|<ahref="https://github.com/gorhill/uBlock/wiki/Dynamic-filtering:-quick-guide"><imgsrc="https://user-images.githubusercontent.com/585534/84045366-b1a77c00-a976-11ea-9121-e8c8f35c66c8.png"/></a><br><sup>Configure as you wish.<br>The image shows 3rd-party scripts and frames blocked by default everywhere.</sup>
Do **NOT** use any other [similarly-purposed blockers][Similarly-Purposed] concurrently with uBO to benefit from its higher efficiency. uBO will [perform][Performance] as well as or better than most of the other popular ad blockers. These other blockers can prevent uBO's privacy or anti-blocker-defusing features from working correctly.
If you ever 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.
