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<li id="toc-uBlock" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#uBlock"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>uBlock</span> </div> </a> <ul id="toc-uBlock-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-uBlock_Origin" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#uBlock_Origin"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>uBlock Origin</span> </div> </a> <ul id="toc-uBlock_Origin-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-uBlock_Origin_Lite" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#uBlock_Origin_Lite"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>uBlock Origin Lite</span> </div> </a> <ul id="toc-uBlock_Origin_Lite-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Features" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Features"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Features</span> </div> </a> <button aria-controls="toc-Features-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Features subsection</span> </button> <ul id="toc-Features-sublist" class="vector-toc-list"> <li id="toc-Blocking_and_filtering" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Blocking_and_filtering"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Blocking and filtering</span> </div> </a> <ul id="toc-Blocking_and_filtering-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Performance_and_efficiency" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Performance_and_efficiency"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Performance and efficiency</span> </div> </a> <ul id="toc-Performance_and_efficiency-sublist" class="vector-toc-list"> <li id="toc-Differential_updates" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Differential_updates"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2.1</span> <span>Differential updates</span> </div> </a> <ul id="toc-Differential_updates-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Environmental_impact" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Environmental_impact"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2.2</span> <span>Environmental impact</span> </div> </a> <ul id="toc-Environmental_impact-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Limitations_in_Chromium-based_browsers" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Limitations_in_Chromium-based_browsers"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Limitations in Chromium-based browsers</span> </div> </a> <ul id="toc-Limitations_in_Chromium-based_browsers-sublist" class="vector-toc-list"> <li id="toc-CNAME_Uncloaking" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#CNAME_Uncloaking"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.1</span> <span>CNAME Uncloaking</span> </div> </a> <ul id="toc-CNAME_Uncloaking-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Supported_platforms" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Supported_platforms"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Supported platforms</span> </div> </a> <button aria-controls="toc-Supported_platforms-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Supported platforms subsection</span> </button> <ul id="toc-Supported_platforms-sublist" class="vector-toc-list"> <li id="toc-Currently_supported" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Currently_supported"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Currently supported</span> </div> </a> <ul id="toc-Currently_supported-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Previously_supported" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Previously_supported"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Previously supported</span> </div> </a> <ul id="toc-Previously_supported-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Notes</span> </div> </a> <ul id="toc-Notes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading">uBlock Origin</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 22 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-22" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">22 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Azerbaijani" lang="az" hreflang="az" data-title="UBlock Origin" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Bosnian" lang="bs" hreflang="bs" data-title="UBlock Origin" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Catalan" lang="ca" hreflang="ca" data-title="UBlock Origin" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Czech" lang="cs" hreflang="cs" data-title="UBlock Origin" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – German" lang="de" hreflang="de" data-title="UBlock Origin" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Greek" lang="el" hreflang="el" data-title="UBlock Origin" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Spanish" lang="es" hreflang="es" data-title="UBlock Origin" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – French" lang="fr" hreflang="fr" data-title="UBlock Origin" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9C%A0%EB%B8%94%EB%A1%9D_%EC%98%A4%EB%A6%AC%EC%A7%84" title="유블록 오리진 – Korean" lang="ko" hreflang="ko" data-title="유블록 오리진" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Italian" lang="it" hreflang="it" data-title="UBlock Origin" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Javanese" lang="jv" hreflang="jv" data-title="UBlock Origin" data-language-autonym="Jawa" data-language-local-name="Javanese" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Lithuanian" lang="lt" hreflang="lt" data-title="UBlock Origin" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Japanese" lang="ja" hreflang="ja" data-title="UBlock Origin" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%AF%E0%A9%82%E0%A8%AC%E0%A8%B2%E0%A9%8C%E0%A8%95_%E0%A8%93%E0%A8%B0%E0%A8%BF%E0%A8%9C%E0%A8%BF%E0%A8%A8" title="ਯੂਬਲੌਕ ਓਰਿਜਿਨ – Punjabi" lang="pa" hreflang="pa" data-title="ਯੂਬਲੌਕ ਓਰਿਜਿਨ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Polish" lang="pl" hreflang="pl" data-title="UBlock Origin" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Portuguese" lang="pt" hreflang="pt" data-title="UBlock Origin" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Russian" lang="ru" hreflang="ru" data-title="UBlock Origin" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Simple English" lang="en-simple" hreflang="en-simple" data-title="UBlock Origin" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Finnish" lang="fi" hreflang="fi" data-title="UBlock Origin" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Turkish" lang="tr" hreflang="tr" data-title="UBlock Origin" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Ukrainian" lang="uk" hreflang="uk" data-title="UBlock Origin" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/UBlock_Origin" title="UBlock Origin – Chinese" lang="zh" hreflang="zh" data-title="UBlock Origin" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q19881587#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/UBlock_Origin" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:UBlock_Origin" rel="discussion" 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href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FUBlock_Origin"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=UBlock_Origin&action=show-download-screen" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=UBlock_Origin&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div 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id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Web browser extension</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">uBlock Origin</caption><tbody><tr><td colspan="2" class="infobox-image logo"><span typeof="mw:File"><a href="/wiki/File:UBlock_Origin.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/UBlock_Origin.svg/70px-UBlock_Origin.svg.png" decoding="async" width="70" height="70" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/UBlock_Origin.svg/105px-UBlock_Origin.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/05/UBlock_Origin.svg/140px-UBlock_Origin.svg.png 2x" data-file-width="128" data-file-height="128" /></a></span></td></tr><tr><td colspan="2" class="infobox-image logo"><span typeof="mw:File"><a href="/wiki/File:Screenshot_of_the_uBlock_Origin_UI_on_Firefox.png" class="mw-file-description"><img alt="uBlock Origin pop-up interface as of version 1.27.6" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Screenshot_of_the_uBlock_Origin_UI_on_Firefox.png/210px-Screenshot_of_the_uBlock_Origin_UI_on_Firefox.png" decoding="async" width="210" height="356" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/0/0d/Screenshot_of_the_uBlock_Origin_UI_on_Firefox.png 1.5x" data-file-width="254" data-file-height="431" /></a></span><div class="infobox-caption">uBlock Origin pop-up interface</div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Original author(s)</a></th><td class="infobox-data">Raymond Hill (gorhill)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data"><b>Current:</b><br />Raymond Hill<br /><b>Past:</b> <br />Deathamns, Chris Aljoudi, Alex Vallat<sup id="cite_ref-Contributors_1-0" class="reference"><a href="#cite_note-Contributors-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">June 23, 2014<span class="noprint">; 10 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">2014-06-23</span>)</span><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">1.61.2<sup id="cite_ref-wikidata-cfa344bf735c40f6dc6df2b5a288bde834b1e09a-v18_3-0" class="reference"><a href="#cite_note-wikidata-cfa344bf735c40f6dc6df2b5a288bde834b1e09a-v18-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> / 19 November 2024<span class="noprint">; 5 days ago</span><span style="display:none"> (<span class="bday dtstart published updated">19 November 2024</span>)</span></div></td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><span class="url"><a rel="nofollow" class="external text" href="https://github.com/gorhill/uBlock">github<wbr />.com<wbr />/gorhill<wbr />/uBlock</a></span> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q19881587#P1324" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></li></ul> </div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="/wiki/JavaScript" title="JavaScript">JavaScript</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="/wiki/Cross-platform" class="mw-redirect" title="Cross-platform">Cross-platform</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Available in</th><td class="infobox-data">72<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> languages</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/Browser_extension" title="Browser extension">Browser extension</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GPLv3</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://github.com/gorhill/uBlock">github<wbr />.com<wbr />/gorhill<wbr />/uBlock</a></span></td></tr></tbody></table> <p><b>uBlock Origin</b> (<span class="rt-commentedText nowrap"><span class="IPA nopopups noexcerpt" lang="en-fonipa"><a href="/wiki/Help:IPA/English" title="Help:IPA/English">/<span style="border-bottom:1px dotted"><span title="/ˈ/: primary stress follows">ˈ</span><span title="/j/: 'y' in 'yes'">j</span><span title="/uː/: 'oo' in 'goose'">uː</span><span title="'b' in 'buy'">b</span><span title="'l' in 'lie'">l</span><span title="/ɒ/: 'o' in 'body'">ɒ</span><span title="'k' in 'kind'">k</span></span>/</a></span></span> <a href="/wiki/Help:Pronunciation_respelling_key" title="Help:Pronunciation respelling key"><i title="English pronunciation respelling"><span style="font-size:90%">YOO</span>-blok</i></a><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>) is a free and <a href="/wiki/Open_source" title="Open source">open-source</a> <a href="/wiki/Browser_extension" title="Browser extension">browser extension</a> for <a href="/wiki/Content_filtering" class="mw-redirect" title="Content filtering">content filtering</a>, including <a href="/wiki/Ad_blocking" title="Ad blocking">ad blocking</a>. The extension is available for <a href="/wiki/Google_Chrome" title="Google Chrome">Chrome</a>, <a href="/wiki/Chromium_(web_browser)" title="Chromium (web browser)">Chromium</a>, <a href="/wiki/Microsoft_Edge" title="Microsoft Edge">Edge</a>, <a href="/wiki/Firefox" title="Firefox">Firefox</a>, <a href="/wiki/Brave_(web_browser)" title="Brave (web browser)">Brave</a>, <a href="/wiki/Opera_(web_browser)" title="Opera (web browser)">Opera</a>, <a href="/wiki/Pale_Moon" title="Pale Moon">Pale Moon</a>, as well as versions of <a href="/wiki/Safari_(web_browser)" title="Safari (web browser)">Safari</a> before 13.<sup id="cite_ref-gorhill_readme_6-0" class="reference"><a href="#cite_note-gorhill_readme-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> uBlock Origin has received praise from technology websites and is reported to be much less memory-intensive than other extensions<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> with similar functionality.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> uBlock Origin's stated purpose is to give users the means to enforce their own (content-filtering) choices.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>uBlock Origin is actively developed and maintained by its creator and lead developer Raymond Hill and the open source community.<sup id="cite_ref-Contributors_1-1" class="reference"><a href="#cite_note-Contributors-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> As of October 2024<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=UBlock_Origin&action=edit">[update]</a></sup>, the Chrome version of uBlock Origin had over 40 million active users and the Firefox version had over 8 million active users.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="uBlock">uBlock</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=2" title="Edit section: uBlock"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>uBlock was initially named "μBlock" but the name was later changed to "uBlock" to avoid confusion as to how the Greek letter <a href="/wiki/%CE%9C" class="mw-redirect" title="Μ">μ</a> (Mu/Micro) in "μBlock" should be pronounced.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2023)">citation needed</span></a></i>]</sup> Development started by <a href="/wiki/Fork_(software_development)" title="Fork (software development)">forking</a> from the <a href="/wiki/Codebase" title="Codebase">codebase</a> of <a href="/wiki/HTTP_Switchboard" class="mw-redirect" title="HTTP Switchboard">HTTP Switchboard</a> along with another blocking extension called uMatrix, designed for advanced users.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> uBlock was developed by Raymond Hill to use community-maintained <a href="/wiki/Blacklist_(computing)" title="Blacklist (computing)">block lists</a>,<sup id="cite_ref-brinkmann_chrome_16-0" class="reference"><a href="#cite_note-brinkmann_chrome-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> while adding features and raising the <a href="/wiki/Software_quality" title="Software quality">code quality</a> to <a href="/wiki/Release_engineering" title="Release engineering">release</a> standards.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> First released in June 2014 as a Chrome and Opera <a href="/wiki/Browser_extension" title="Browser extension">extension</a>, in 2015 the extension became available in other browsers.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2023)">citation needed</span></a></i>]</sup> </p><p>A joint Sourcepoint and <a href="/wiki/ComScore" class="mw-redirect" title="ComScore">comScore</a> survey reported an 833% growth from November 2014 to August 2015, the strongest growth among adblockers listed.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> The report attributed the growth to the desire of users for pure blockers, outside the "<a href="/wiki/Acceptable_Ads" class="mw-redirect" title="Acceptable Ads">acceptable ads</a>" program operated by <a href="/wiki/Adblock_Plus" title="Adblock Plus">Adblock Plus</a>.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p><p>On April 3, 2015, Hill transferred the uBlock project to Chris Aljoudi due to frustrations with dealing with requests as the project's popularity increased.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> "These projects are to me, not a full time job. It stopped being a hobby when it felt more and more like a tedious job. I will keep maintaining my version (and share with whoever care[s] to use it) because it guarantees the tool will match what I want out of it."<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> Hill created his own fork and renamed it uBlock Origin on April 6.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p><p>Since October 2017, uBlock Origin has been completely separated from Aljoudi's uBlock.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> Aljoudi created ublock.org to host and promote uBlock and to request donations. In response, uBlock's founder Raymond Hill stated that "the donations sought by ublock.org are not benefiting any of those who contributed most to create uBlock Origin."<sup id="cite_ref-gorhill_readme_6-1" class="reference"><a href="#cite_note-gorhill_readme-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> The development of uBlock stopped in August 2015 but there were sporadic updates from January 2017.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p><p>In July 2018, ublock.org was acquired by <a href="/wiki/AdBlock" title="AdBlock">AdBlock</a> and resumed development.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> From February 2019, uBlock began allowing users to participate in "acceptable ads",<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> a program run by Adblock Plus that allows some ads deemed "acceptable" and nonintrusive, and for which larger publishers pay a fee.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="uBlock_Origin">uBlock Origin</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=3" title="Edit section: uBlock Origin"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>uBlock Origin remains independent and does not allow ads for payment.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> The project refuses donations and instead advises supporters to donate to maintainers of block lists.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> Hill continued to work on the extension under the name uBlock Origin, abbreviated as uBO<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> and originally as uBlock<sub>0</sub>.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p><p>In January 2016, uBlock Origin was added to the repositories for <a href="/wiki/Debian" title="Debian">Debian</a> 9 and <a href="/wiki/Ubuntu" title="Ubuntu">Ubuntu</a> 16.04.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> The extension was awarded "Pick of the Month" by <a href="/wiki/Mozilla" title="Mozilla">Mozilla</a> for May 2016.<sup id="cite_ref-pickofmonth_35-0" class="reference"><a href="#cite_note-pickofmonth-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p><p>On December 11, 2016, Nik Rolls released a <a href="/wiki/Fork_(software_development)" title="Fork (software development)">fork</a> of uBlock Origin for the Microsoft Edge browser (now known as <a href="/wiki/Microsoft_Edge#Edge_Legacy_(2014–2019)" title="Microsoft Edge">Microsoft Edge Legacy</a>).<sup id="cite_ref-microsoftedge_36-0" class="reference"><a href="#cite_note-microsoftedge-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> In April 2020, this fork was deprecated as Microsoft replaced Microsoft Edge Legacy with a Chromium-based Edge.<sup id="cite_ref-:2_37-0" class="reference"><a href="#cite_note-:2-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="uBlock_Origin_Lite">uBlock Origin Lite</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=4" title="Edit section: uBlock Origin Lite"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:UBlock_Origin_Lite.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/10/UBlock_Origin_Lite.svg/220px-UBlock_Origin_Lite.svg.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/10/UBlock_Origin_Lite.svg/330px-UBlock_Origin_Lite.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/10/UBlock_Origin_Lite.svg/440px-UBlock_Origin_Lite.svg.png 2x" data-file-width="128" data-file-height="128" /></a><figcaption>UBlock Origin Lite</figcaption></figure> <p>In 2023, Google made changes known as "<a href="/wiki/Manifest_V3" class="mw-redirect" title="Manifest V3">Manifest V3</a>" to the WebRequest API used by <a href="/wiki/Ad_blocking" title="Ad blocking">ad blocking</a> and privacy extensions to block and modify network connections.<sup id="cite_ref-:1_38-0" class="reference"><a href="#cite_note-:1-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Following Google's implementation of Manifest V3 and the end of support for V2, uBlock Origin's effectiveness is drastically reduced in <a href="/wiki/Google_Chrome" title="Google Chrome">Google Chrome</a> and other <a href="/wiki/Chromium_(web_browser)" title="Chromium (web browser)">Chromium</a>-based browsers.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> </p><p>As a result, uBlock Origin Lite was created and designed to comply with the Manifest V3 (MV3) extension framework. uBO Lite differs significantly from uBO in several key aspects, primarily due to the constraints and design goals associated with MV3. Specifically, it lacks filter list updates outside of extension updates, and has no custom filters, strict-blocked pages, per-site switches, or dynamic filtering. Non-Chromium browsers such as <a href="/wiki/Firefox" title="Firefox">Firefox</a> are unaffected.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> Google has been criticized for implementing some of these features due to its domination in the online advertising market.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> </p><p>As of October 2024, the Chrome version of uBlock Origin Lite has over 700,000 active users.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Features">Features</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=5" title="Edit section: Features"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Blocking_and_filtering">Blocking and filtering</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=6" title="Edit section: Blocking and filtering"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>uBlock Origin supports the majority of <a href="/wiki/Adblock_Plus" title="Adblock Plus">Adblock Plus</a>'s <a href="/wiki/Adblock_Plus#Filters" title="Adblock Plus">filter syntax</a>. The popular filter lists <a href="/wiki/Easylist" class="mw-redirect" title="Easylist"><i>EasyList</i></a> and <i>EasyPrivacy</i> are enabled by default. The extensions are capable of importing <a href="/wiki/Hosts_(file)" title="Hosts (file)">hosts files</a> and a number of community-maintained lists are available at installation. Among the host files available, <i>Peter Lowe's ad servers & tracking list</i> and lists of malware domains such as uBlock Origin's own anti-malicious filter called <i>Badware risks</i> are also enabled as default, preventing users from visiting malicious websites such as those used for phishing, scams, malware, and more.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> Some additional features include dynamic filtering of scripts and <a href="/wiki/HTML_element#Frames" title="HTML element">iframes</a> and a tool for webpage element hiding.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (September 2023)">citation needed</span></a></i>]</sup> </p><p>uBlock Origin includes a growing list of features not available in uBlock, including: </p> <ul><li>A mode to assist those with <a href="/wiki/Color_vision_deficiency" class="mw-redirect" title="Color vision deficiency">color vision deficiency</a>.</li> <li>A dynamic URL filtering feature.</li> <li>Logging functionality.</li> <li>Interface enhancements including a <a href="/wiki/Document_Object_Model" title="Document Object Model">DOM</a> inspector, privacy-oriented options to block <a href="/wiki/Link_prefetching" title="Link prefetching">link prefetching</a>, hyperlink auditing, and IP address leaks via <a href="/wiki/WebRTC" title="WebRTC">WebRTC</a> (this feature was removed in version 1.38 on all platforms except Android, as most browsers are no longer vulnerable<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup>).</li></ul> <p>Site-specific switches to toggle the blocking of <a href="/wiki/Pop-up_ad" title="Pop-up ad">pop-ups</a>, strict domain blocking, cosmetic filtering, blocking remote fonts, and JavaScript disabling were also added to uBlock Origin.<sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> The Firefox version of uBlock Origin has an extra feature which helps to foil attempts by web sites to circumvent blockers.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Performance_and_efficiency">Performance and efficiency</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=7" title="Edit section: Performance and efficiency"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Technology websites and user reviews for uBlock Origin have regarded the extension as less resource-intensive than extensions that provide similar feature sets such as Adblock Plus.<sup id="cite_ref-lynch_firefox_53-0" class="reference"><a href="#cite_note-lynch_firefox-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> A <a href="/wiki/Benchmark_(computing)" title="Benchmark (computing)">benchmark test</a>, conducted in August 2015 with ten blocking extensions, showed uBlock Origin as the most resource-efficient among the extensions tested.<sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> </p><p>uBlock Origin surveys what style resources are required for an individual <a href="/wiki/Web_page" title="Web page">web page</a> rather than relying on a universal <a href="/wiki/Style_sheet_(web_development)" title="Style sheet (web development)">style sheet</a>. The extension takes a <a href="/wiki/Snapshot_(computer_storage)" title="Snapshot (computer storage)">snapshot</a> of the filters the user has enabled, which contributes to accelerated browser start-up speed when compared to retrieving filters from cache every time.<sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Differential_updates">Differential updates</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=8" title="Edit section: Differential updates"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Starting with version 1.54, uBlock Origin introduced the implementation of <a href="/wiki/Delta_update" title="Delta update">differential updates (delta updates)</a>, which allows the extension to fetch only changes to filter lists rather than downloading the entire list. This results in lower bandwidth consumption and more frequent updates. This change was part of uBlock Origin’s efforts to reduce both requests and bandwidth usage, with the goal of not being ranked among the most bandwidth-intensive projects on <a href="/wiki/JSDelivr" title="JSDelivr">jsDelivr</a>, as reflected in public statistics.<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Environmental_impact">Environmental impact</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=9" title="Edit section: Environmental impact"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>According to a research paper, uBlock Origin was able to reduce web page load times by 28.5%, the highest efficiency compared to other ad blockers like <a href="/wiki/Adblock_Plus" title="Adblock Plus">AdBlock Plus</a> and <a href="/wiki/Privacy_Badger" title="Privacy Badger">Privacy Badger</a>. Its use could significantly reduce energy consumption, saving an estimated 100 hours of browsing time annually for the average global user.<sup id="cite_ref-:3_60-0" class="reference"><a href="#cite_note-:3-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> </p><p>If widely adopted in the <a href="/wiki/United_States" title="United States">United States</a>, it could save over $117 million per year in electricity costs, and globally, it could result in savings exceeding $1.8 billion. The research report also suggests that widespread use of uBlock Origin could have environmental benefits, potentially preventing pollution-related deaths caused by coal-fired power generation used to support the extra energy consumption from ads.<sup id="cite_ref-:3_60-1" class="reference"><a href="#cite_note-:3-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Limitations_in_Chromium-based_browsers">Limitations in Chromium-based browsers</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=10" title="Edit section: Limitations in Chromium-based browsers"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>According to the creator and lead developer Raymond Hill of the extension, uBlock Origin works best on <a href="/wiki/Firefox" title="Firefox">Firefox</a>.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> The main reason is that uBlock Origin (uBO) faces several technical limitations when used on <a href="/wiki/Chromium_(web_browser)" title="Chromium (web browser)">Chromium-based browsers</a> compared to its performance on Firefox, and as a result, users may experience less effective ad blocking, potential exposure to unwanted content, and slower performance when using uBO on Chromium-based browsers:<sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="CNAME_Uncloaking">CNAME Uncloaking</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=11" title="Edit section: CNAME Uncloaking"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In November 2019, a uBlock Origin user reported a novel technique used by some sites to bypass third-party tracker blocking. These sites link to URLs that are sub-domains of the page's domain, but those sub-domains resolve to third-party hosts via a <a href="/wiki/CNAME_record" title="CNAME record">CNAME record</a>. Since the initial URL contained a sub-domain of the current page, it was interpreted by browsers as a first-party request and so was allowed by the filtering rules in uBlock Origin (and in similar extensions). The uBlock Origin developer came up with a solution using a DNS API which is exclusive to Firefox 60+.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> The new feature was implemented in uBlock Origin 1.25, released on February 19, 2020.<sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup> </p><p>Chromium-based browsers lack the ability to uncloak third-party servers disguised as first-party through <a href="/wiki/CNAME_record" title="CNAME record">CNAME records</a>. This limitation reduces the efficiency of blocking third-party trackers, a capability that uBO fully utilizes on Firefox. </p><p>Furthermore: </p> <ul><li><b>IP address filtering</b>: In version 1.60, uBO introduced the ability to block network requests based on their IP addresses. This is achieved by fetching the DNS records for a specific URL and filtering according to the IPs found. Full support is available for Firefox-based browsers, while Chromium-based browsers can only filter when an IP address is directly used in the URL instead of a hostname.</li> <li><b>HTML Filtering</b>: uBO's ability to filter the response body of <a href="/wiki/HTML_element" title="HTML element">HTML documents</a> before they are parsed by the browser is hindered in Chromium-based browsers. This feature, enabled by the <code>webRequest.filterResponseData()</code> <a href="/wiki/API" title="API">API</a>, is currently only available in Firefox, limiting the effectiveness of uBO's HTML filtering on Chromium-based platforms.</li> <li><b>Response Body Filtering</b>: The <code>replace=</code> option in network filtering, which allows for response body modification, is less effective in Chromium-based browsers. Firefox's support for this feature enables more robust content manipulation.</li> <li><b>Browser Launch Filtering</b>: On Chromium-based browsers, uBO may not be fully ready to block network requests from already opened tabs immediately upon browser launch. This can allow some tracker or advertisement payloads to load before uBO becomes active, which is especially problematic for users who utilize default-deny modes for third-party resources or JavaScript. While there is a mitigation setting available, it is not enabled by default and does not cover all use cases.</li> <li><b>Pre-fetching</b>: In Chromium-based browsers, websites may override user settings regarding <a href="/wiki/Prefetching" title="Prefetching">pre-fetching</a>, potentially leading to unwanted network requests. Firefox, in contrast, reliably prevents pre-fetching when it is disabled in uBO.</li> <li><b>WebAssembly Usage</b>: uBO does not use <a href="/wiki/WebAssembly" title="WebAssembly">WebAssembly</a> for core filtering code paths on Chromium-based browsers due to the additional permissions required in the extension manifest, which could complicate the extension's publication in the <a href="/wiki/Chrome_Web_Store" title="Chrome Web Store">Chrome Web Store</a>. This limitation can affect performance and functionality.</li> <li><b>Storage Compression</b>: uBO on Chromium-based browsers cannot effectively use <a href="/wiki/LZ4_(compression_algorithm)" title="LZ4 (compression algorithm)">LZ4 compression</a> for storing filter lists and other data due to issues with <a href="/wiki/Indexed_Database_API" title="Indexed Database API">IndexedDB</a> in incognito mode. IndexedDB instances are reset in incognito mode, causing uBO to start with out-of-date filter lists and reduced efficiency. Firefox does not face this issue, allowing for more efficient storage and retrieval of data.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Supported_platforms">Supported platforms</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=12" title="Edit section: Supported platforms"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>uBlock Origin is actively developed for applications based on two major layout engines.<sup id="cite_ref-brinkmann_chrome_16-1" class="reference"><a href="#cite_note-brinkmann_chrome-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-lynch_firefox_53-1" class="reference"><a href="#cite_note-lynch_firefox-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-safari_ext_65-0" class="reference"><a href="#cite_note-safari_ext-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Currently_supported">Currently supported</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=13" title="Edit section: Currently supported"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Blink_(browser_engine)" title="Blink (browser engine)">Blink</a> <ul><li><a href="/wiki/Google_Chrome" title="Google Chrome">Google Chrome</a>/<a href="/wiki/Chromium_(web_browser)" title="Chromium (web browser)">Chromium</a> (desktop)</li> <li><a href="/wiki/Brave_(web_browser)" title="Brave (web browser)">Brave</a> (desktop)</li> <li><a href="/wiki/Opera_(web_browser)" title="Opera (web browser)">Opera</a> (desktop)</li> <li><a href="/wiki/Microsoft_Edge" title="Microsoft Edge">Microsoft Edge</a> (Chromium) (desktop)</li> <li>Kiwi (mobile)<sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup></li></ul></li> <li><a href="/wiki/Gecko_(software)" title="Gecko (software)">Gecko</a> <ul><li><a href="/wiki/Firefox" title="Firefox">Firefox</a> (desktop: 0.85.5 and later)<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Firefox_for_Android" title="Firefox for Android">Firefox for Android</a> (mobile: 0.9.1.0 and later)</li> <li><a href="/wiki/Mozilla_Thunderbird" title="Mozilla Thunderbird">Thunderbird</a> (desktop: 1.3.0 and later)</li> <li><a href="/wiki/SeaMonkey" title="SeaMonkey">SeaMonkey</a></li></ul></li></ul> <div class="mw-heading mw-heading3"><h3 id="Previously_supported">Previously supported</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=14" title="Edit section: Previously supported"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/WebKit" title="WebKit">WebKit</a> <ul><li><a href="/wiki/Safari_(web_browser)" title="Safari (web browser)">Safari</a><span> (desktop: uBlock Origin 1.10.0 and later (Beta)).</span><sup id="cite_ref-:0_68-0" class="reference"><a href="#cite_note-:0-68"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-69" class="reference"><a href="#cite_note-69"><span class="cite-bracket">[</span>note 2<span class="cite-bracket">]</span></a></sup> Stopped working with <a href="/wiki/MacOS_Catalina" title="MacOS Catalina">macOS 10.15 Catalina</a> and Safari 13.<sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-safari_drop_ublock_71-0" class="reference"><a href="#cite_note-safari_drop_ublock-71"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup></li></ul></li> <li><a href="/wiki/EdgeHTML" title="EdgeHTML">EdgeHTML</a> <ul><li><a href="/wiki/Microsoft_Edge" title="Microsoft Edge">Microsoft Edge</a> (legacy) (uBlock Origin is available on the <a href="/wiki/Windows_Store" class="mw-redirect" title="Windows Store">Windows Store</a> in beta from 1.10.0).<sup id="cite_ref-:2_37-1" class="reference"><a href="#cite_note-:2-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-microsoftedge_36-1" class="reference"><a href="#cite_note-microsoftedge-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-72" class="reference"><a href="#cite_note-72"><span class="cite-bracket">[</span>note 3<span class="cite-bracket">]</span></a></sup></li></ul></li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=15" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .portalbox-entry{display:table-row;font-size:85%;line-height:110%;height:1.9em;font-style:italic;font-weight:bold}.mw-parser-output .portalbox-image{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portalbox-link{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}@media(min-width:720px){.mw-parser-output .portalleft{clear:left;float:left;margin:0.5em 1em 0.5em 0}.mw-parser-output .portalright{clear:right;float:right;margin:0.5em 0 0.5em 1em}}</style><ul role="navigation" aria-label="Portals" class="noprint portalbox portalborder portalright"> <li class="portalbox-entry"><span class="portalbox-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/28px-Free_and_open-source_software_logo_%282009%29.svg.png" decoding="async" width="28" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/42px-Free_and_open-source_software_logo_%282009%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/56px-Free_and_open-source_software_logo_%282009%29.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span></span><span class="portalbox-link"><a href="/wiki/Portal:Free_and_open-source_software" title="Portal:Free and open-source software">Free and open-source software portal</a></span></li><li class="portalbox-entry"><span class="portalbox-image"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Crystal_Clear_app_linneighborhood.svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Crystal_Clear_app_linneighborhood.svg/28px-Crystal_Clear_app_linneighborhood.svg.png" decoding="async" width="28" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Crystal_Clear_app_linneighborhood.svg/42px-Crystal_Clear_app_linneighborhood.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Crystal_Clear_app_linneighborhood.svg/56px-Crystal_Clear_app_linneighborhood.svg.png 2x" data-file-width="407" data-file-height="407" /></a></span></span><span class="portalbox-link"><a href="/wiki/Portal:Internet" title="Portal:Internet">Internet portal</a></span></li></ul> <ul><li><a href="/wiki/NoScript" title="NoScript">NoScript</a></li> <li><a href="/wiki/Privacy_Badger" title="Privacy Badger">Privacy Badger</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=16" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-67"><span class="mw-cite-backlink"><b><a href="#cite_ref-67">^</a></b></span> <span class="reference-text">uBlock also supports Firefox legacy browsers (including SeaMonkey and Pale Moon), use the firefox-legacy release starting with firefox-legacy-1.16.4, see <span class="url"><a rel="nofollow" class="external text" href="https://github.com/gorhill/uBlock-for-firefox-legacy">github<wbr />.com<wbr />/gorhill<wbr />/uBlock-for-firefox-legacy</a></span>)</span> </li> <li id="cite_note-69"><span class="mw-cite-backlink"><b><a href="#cite_ref-69">^</a></b></span> <span class="reference-text">Unofficial release. Fork by <i><a rel="nofollow" class="external text" href="https://github.com/el1t">Ellis Tsung (el1t)</a></i> for <a href="/wiki/Safari_browser" class="mw-redirect" title="Safari browser">Safari</a> from the official project.</span> </li> <li id="cite_note-72"><span class="mw-cite-backlink"><b><a href="#cite_ref-72">^</a></b></span> <span class="reference-text">Unofficial release. Fork by <i><a rel="nofollow" class="external text" href="https://github.com/nikrolls/uBlock-Edge">Nik Rolls (nikrolls)</a></i> for <a href="/wiki/Microsoft_Edge" title="Microsoft Edge">Microsoft Edge</a>.</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=17" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-Contributors-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Contributors_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Contributors_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/gorhill/uBlock/graphs/contributors">"Contributors to gorhill/uBlock"</a>. <i>GitHub</i><span class="reference-accessdate">. Retrieved <span class="nowrap">December 4,</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=Contributors+to+gorhill%2FuBlock&rft_id=https%3A%2F%2Fgithub.com%2Fgorhill%2FuBlock%2Fgraphs%2Fcontributors&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUBlock+Origin" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/gorhill/uBlock/wiki/Change-log#0100">"Changelog for the first versions"</a>. <i><a href="/wiki/GitHub" title="GitHub">GitHub</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">December 4,</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=Changelog+for+the+first+versions&rft_id=https%3A%2F%2Fgithub.com%2Fgorhill%2FuBlock%2Fwiki%2FChange-log%230100&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUBlock+Origin" class="Z3988"></span></span> </li> <li id="cite_note-wikidata-cfa344bf735c40f6dc6df2b5a288bde834b1e09a-v18-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-wikidata-cfa344bf735c40f6dc6df2b5a288bde834b1e09a-v18_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/gorhill/uBlock/releases/tag/1.61.2">"Release 1.61.2"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">November 19,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Release+1.61.2&rft_id=https%3A%2F%2Fgithub.com%2Fgorhill%2FuBlock%2Freleases%2Ftag%2F1.61.2&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUBlock+Origin" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://crowdin.com/project/ublock">"Completed translations"</a>. <i>Crowdin.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">May 16,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Crowdin.com&rft.atitle=Completed+translations&rft_id=https%3A%2F%2Fcrowdin.com%2Fproject%2Fublock&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUBlock+Origin" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/gorhill/uBlock/blob/master/README.md">"uBlock Origin: README.md"</a>. <i>uBlock GitHub Repository</i>. 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title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=Explanation+of+the+state+of+uBlock+Origin+%28and+other+blockers%29+for+Safari&rft_id=https%3A%2F%2Fgithub.com%2Fel1t%2FuBlock-Safari%2Fissues%2F158&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUBlock+Origin" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UBlock_Origin&action=edit&section=18" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output 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