Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release

<!DOCTYPE html> <html class="no-js" lang="en-US" dir="ltr" data-gtm-container-id="G-2VC139B3XV" data-ga-content-group="kb-article" data-ga-default-slug="firefox-mac-osx-users-esr" data-ga-article-locale="en-US" data-ga-topics="/installation-and-updates/" data-ga-products="/firefox/firefox-enterprise/" > <head>   <script src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/gtm-snippet.1c0037a49b66fb06.js" nonce="5ZNFx9N2HMPVHzKTlha50Q=="></script>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title> Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release | Mozilla Support </title> <link rel="apple-touch-icon" sizes="180x180" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/apple-touch-icon.bdc11b610d791a16.png"> <link rel="icon" type="image/png" sizes="32x32" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/favicon-32x32.2143cdf0c7e3f377.png"> <link rel="icon" type="image/png" sizes="16x16" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/favicon-16x16.352a0a2cef154dda.png"> <link rel="manifest" href="/manifest.json"> <link rel="shortcut icon" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/favicon.03d97697df808c0e.ico"> <meta name="theme-color" content="#ffffff"> <link rel="search" type="application/opensearchdescription+xml" title="Mozilla Support" href="/en-US/search/xml"/> <link href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/screen.7c7f344f96f6c2a7.css" rel="stylesheet" nonce="5ZNFx9N2HMPVHzKTlha50Q=="> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/620.c017de8a3c1e20cf.js" nonce="5ZNFx9N2HMPVHzKTlha50Q=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.a856f1c1afbd9b67.js" nonce="5ZNFx9N2HMPVHzKTlha50Q=="></script> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/566.de80f82c1815ff6e.js" nonce="5ZNFx9N2HMPVHzKTlha50Q=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/467.e805b3b5a73440ca.js" nonce="5ZNFx9N2HMPVHzKTlha50Q=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/document.58bdb8f917cf5fd3.js" nonce="5ZNFx9N2HMPVHzKTlha50Q=="></script> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.fx.download.6e0d6173cf4fde5d.js" nonce="5ZNFx9N2HMPVHzKTlha50Q=="></script> <meta name="description" content="Firefox 78 was the last supported version for Mac OS X 10.9, 10.10 and 10.11. 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Continue to ask your question and get help.</p> <a class="sumo-button primary-button feature-box" href="/en-US/kb/get-community-support?exit_aaq=1" data-event-name="link_click" data-event-parameters='{ "link_name": "aaq-widget.community-support.kb-article", "link_detail": "None" }'> Continue </a> </div> <nav id="doc-tools"> <ul class="sidebar-nav sidebar-folding"> <li id="editing-tools-sidebar"> <span class="details-heading"></span> <ul class="sidebar-nav--list"> <li> <section class="showfor" id="showfor-panel"> <script type="application/json" class="showfor-data"> {"products": [{"title": "Firefox", "slug": "firefox", "platforms": ["win8", "win7", "winxp", "mac", "linux", "win10", "win11"], "visible": true}, {"title": "Firefox for Enterprise", "slug": "firefox-enterprise", "platforms": ["win8", "win7", "mac", "linux", "win10"], "visible": true}], "versions": {"firefox": [{"name": "Version 134", "slug": "fx134", "product": "firefox", "default": false, "min_version": 134.0, 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{"name": "Version 7", "slug": "fx7", "product": "firefox", "default": false, "min_version": 7.0, "max_version": 8.0, "visible": false}, {"name": "Version 6", "slug": "fx6", "product": "firefox", "default": false, "min_version": 6.0, "max_version": 7.0, "visible": false}, {"name": "Version 5", "slug": "fx5", "product": "firefox", "default": false, "min_version": 5.0, "max_version": 6.0, "visible": false}, {"name": "Version 4", "slug": "fx4", "product": "firefox", "default": false, "min_version": 4.0, "max_version": 5.0, "visible": false}, {"name": "Version 117", "slug": "fx117", "product": "firefox", "default": false, "min_version": -1.0, "max_version": 1.0, "visible": false}], "firefox-enterprise": []}, "platforms": {"firefox": [{"name": "Linux", "slug": "linux", "visible": true}, {"name": "Mac", "slug": "mac", "visible": true}, {"name": "Windows XP", "slug": "winxp", "visible": true}, {"name": "Windows 7/Vista", "slug": "win7", "visible": true}, {"name": "Windows 8", "slug": "win8", "visible": true}, {"name": "Windows 10", "slug": "win10", "visible": true}, {"name": "Windows 11", "slug": "win11", "visible": true}], "firefox-enterprise": [{"name": "Linux", "slug": "linux", "visible": true}, {"name": "Mac", "slug": "mac", "visible": true}, {"name": "Windows 7/Vista", "slug": "win7", "visible": true}, {"name": "Windows 8", "slug": "win8", "visible": true}, {"name": "Windows 10", "slug": "win10", "visible": true}]}} </script> <h3 class="sidebar-subheading force-top-margin">Customize this article</h3> <div class="product" data-product="firefox"> <div class="field checkbox is-condensed"> <input type="checkbox" id="id_firefox" checked value="product:firefox" /> <label for="id_firefox">Firefox</label> </div> <div class="selectbox-wrapper"> <select class="version"> <option value="version:fx134" data-min="134.0" data-max="135.0" > Version 134 </option> <option value="version:fx133" data-min="133.0" data-max="134.0" > Version 133 </option> <option value="version:fx132" data-min="132.0" data-max="133.0" selected> Version 132 </option> <option value="version:fx131" data-min="131.0" data-max="132.0" > Version 131 </option> <option value="version:fx130" data-min="130.0" data-max="131.0" > Version 130 </option> <option value="version:fx129" data-min="129.0" data-max="130.0" > Version 129 </option> <option value="version:fx128" data-min="128.0" data-max="129.0" > Version 128 </option> <option value="version:fx127" data-min="127.0" data-max="128.0" > Version 127 </option> <option value="version:fx126" data-min="126.0" data-max="127.0" > Version 126 </option> <option value="version:fx125" data-min="125.0" data-max="126.0" > Version 125 </option> <option value="version:fx124" data-min="124.0" data-max="125.0" > Version 124 </option> <option value="version:fx123" data-min="123.0" data-max="124.0" > Version 123 </option> <option value="version:fx122" data-min="122.0" data-max="123.0" > Version 122 </option> <option value="version:fx121" data-min="121.0" data-max="122.0" > Version 121 </option> <option value="version:fx120" data-min="120.0" data-max="121.0" > Version 120 </option> <option value="version:fx119" data-min="119.0" data-max="120.0" > Version 119 </option> <option value="version:fx118" data-min="118.0" data-max="119.0" > Version 118 </option> <option value="version:fx117" data-min="117.0" data-max="118.0" > Version 117 </option> <option value="version:fx116" data-min="116.0" data-max="117.0" > Version 116 </option> <option value="version:fx115" data-min="115.0" data-max="116.0" > Version 115 </option> </select> </div> <div class="selectbox-wrapper"> <select class="platform"> <option value="platform:win8" > Windows 8 </option> <option value="platform:win7" > Windows 7/Vista </option> <option value="platform:winxp" > Windows XP </option> <option value="platform:mac" > Mac </option> <option value="platform:linux" > Linux </option> <option value="platform:win10" > Windows 10 </option> <option value="platform:win11" > Windows 11 </option> </select> </div> </div> <div class="product" data-product="firefox-enterprise"> <div class="field checkbox is-condensed"> <input type="checkbox" id="id_firefox-enterprise" checked value="product:firefox-enterprise" /> <label for="id_firefox-enterprise">Firefox for Enterprise</label> </div> <div class="selectbox-wrapper"> <select class="platform"> <option value="platform:win8" > Windows 8 </option> <option value="platform:win7" > Windows 7/Vista </option> <option value="platform:mac" > Mac </option> <option value="platform:linux" > Linux </option> <option value="platform:win10" > Windows 10 </option> </select> </div> </div> </section> </li> </ul> </li> </ul> </nav> <div class="document-vote--sidebar-wrap"> <div class="document-vote elevation-01 text-center"> <form class="document-vote--form helpful" action="/en-US/kb/firefox-mac-osx-users-esr/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='DxMFzFgWqA0NWIXhSM4ki6w7uScSNgvHXTLWEHyW2PqAjqWqcoBdLIocU8JoQ3bY' /> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"> <input type="hidden" name="revision_id" value="236059" /> <input type="hidden" name="source" value="footer" /> <button type="submit" class="btn helpful-button" name="helpful"><span class="hidden-text">Yes</span>👍</button> <button type="submit" class="btn not-helpful-button" name="not-helpful"><span class="hidden-text">No</span>👎</button> <img class="wait" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/spinner.18d6c26adc937688.gif" alt="Please wait..." /> </div> </form> </div> </div> </aside> <main role="main" class="sumo-l-two-col--main"> <section id="document-list"> <header class="sumo-article-header kb-header"> <div class="sumo-article-header--text"> <div class="documents-product-title"> <a href="/en-US/products/firefox" title="Firefox"> <img src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/products/2020-04-14-08-36-13-8dda6f.png" height="48" width="48" alt="" /> </a> <div class="firefox-download-button hidden"> <div class="download-buttons"> <div class="download-firefox"> <a href="https://www.mozilla.org/firefox/new/?utm_source=support.mozilla.org&utm_medium=referral&utm_campaign=non-fx-button&utm_content=body-download-button" class="download-button sumo-button primary-button button-lg"> Download Firefox </a> <ul class="download-info text-body-xs"> <li><a href="https://www.mozilla.org/firefox/all/">Systems and Languages</a></li> <li><a href="https://www.mozilla.org/firefox/notes">What's New</a></li> <li><a href="https://www.mozilla.org/legal/privacy/firefox">Privacy</a></li> </ul> </div> </div> </div> </div> <h1 class="sumo-page-heading">Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release</h1> </div> </header> <article class="wiki-doc"> <div id="document_metadata" class="has-border-bottom"> <span class="product tooltip-container"> Firefox, Firefox for... <span class="tooltip">Firefox, Firefox for Enterprise</span> </span> <span class="last-updated"> <img class="pencil" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/pencil.e33c563f24c4f989.svg" /> <strong>Last updated:</strong> <span class="time"> <time datetime="2022-01-07T22:57:50-08:00">1/7/22</time> </span> </span> <span class="helpful-info"> <img class="thumbsup" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/thumbs-up.2cbd5d41625a84a7.svg"/><span class="helpful-count">47%</span> of users voted this helpful </span> </div> <section id="doc-content" class="document--content "> <p><a href="/en-US/kb/find-what-version-firefox-you-are-using">Firefox version</a> 78 was the last supported Firefox version for Mac users of OS X 10.9 Mavericks, OS X 10.10 Yosemite and OS X 10.11 El Capitan. These users were moved to the Firefox <a href="https://www.mozilla.org/firefox/enterprise">Extended Support Release</a> (ESR) channel by an application update. This was done to provide security updates until the final Firefox 78 ESR update (version 78.15.0esr) was released on October 5, 2021. Affected users will not receive any further security updates. </p> <h1 id="w_why-has-firefox-ended-support-for-os-x-10-9-10-10-and-10-11-users">Why has Firefox ended support for OS X 10.9, 10.10 and 10.11 users?</h1> <p>Although Apple does not have a public policy governing security updates for older OS X releases, its practice is to support the most recent three releases. Apple made the last security update applicable to OS X 10.11 available in July 2018. Unsupported operating systems do not receive security updates, have known exploits and can be dangerous to use, which makes it difficult to maintain Firefox on those versions. </p> <h1 id="w_can-i-still-browse-safely-with-firefox-on-os-x-10-9-10-10-or-10-11">Can I still browse safely with Firefox on OS X 10.9, 10.10 or 10.11?</h1> <p>Up until October 2021, we were updating affected users with critical security updates through the <a href="https://www.mozilla.org/firefox/enterprise">Firefox ESR</a> channel, to help retain the best possible security. After this, no security updates will be provided. </p> <h1 id="w_how-can-i-get-the-newest-features-of-firefox">How can I get the newest features of Firefox?</h1> <p>If you want to keep your Firefox version up to date, you need to upgrade your operating system to macOS 10.12 or higher. Apple does not support older versions. They are unreliable and unsafe to use, which also makes it difficult to maintain Firefox on those versions. </p> </section> <p class="share-link"> <br/> Share this article: <a href="https://mzl.la/3Qw06O9">https://mzl.la/3Qw06O9</a> </p> </article> <section class="sumo-page-section hide-on-large"> <div class="document-vote elevation-01 text-center"> <form class="document-vote--form helpful" action="/en-US/kb/firefox-mac-osx-users-esr/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='DxMFzFgWqA0NWIXhSM4ki6w7uScSNgvHXTLWEHyW2PqAjqWqcoBdLIocU8JoQ3bY' /> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"> <input type="hidden" name="revision_id" value="236059" /> <input type="hidden" name="source" value="footer" /> <button type="submit" class="btn helpful-button" name="helpful"><span class="hidden-text">Yes</span>👍</button> <button type="submit" class="btn not-helpful-button" name="not-helpful"><span class="hidden-text">No</span>👎</button> <img class="wait" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/spinner.18d6c26adc937688.gif" alt="Please wait..." /> </div> </form> </div> </section> <section id="doc-contributors" class="document--contributors sumo-page-section"> <p class="help-title text-body-md">These fine people helped write this article:</p> <div class="document--contributors-list text-body-xs"><a class="user secondary-color" rel="nofollow" href="/en-US/user/AliceWyman/">AliceWyman</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/anlazar/">Angela Lazar</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/serveshad/">servesha</a></div> </section> <section class="sumo-page-section"> <div class="card card--callout is-full-width has-moz-headings"> <div class="card--callout-wrap-narrow"> <img class="card--feature-img" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/volunteer.a3be8d331849774b.png" alt="Illustration of hands" /> <div class="card--details"> <h3 class="card--title">Volunteer</h3> <p class="card--desc">Grow and share your expertise with others. 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Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release | Mozilla Support