SmartBlock for Enhanced Tracking Protection

<!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="smartblock-enhanced-tracking-protection" data-ga-article-locale="en-US" data-ga-topics="/privacy-and-security/tracking-protection/" data-ga-products="/firefox/" > <head>   <script src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/gtm-snippet.1c0037a49b66fb06.js" nonce="Jlx6ffOVoPMTbRqC/hLFpg=="></script>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title> SmartBlock for Enhanced Tracking Protection | Firefox Help </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" 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</li> <li> <a href="/en-US/questions/topic/email-and-messaging" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "email-and-messaging" }'> Email and messaging </a> </li> <li> <a href="/en-US/questions/topic/performance-and-connectivity" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "performance-and-connectivity" }'> Performance and connectivity </a> </li> <li> <a href="/en-US/questions/topic/privacy-and-security" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "privacy-and-security" }'> Privacy and security </a> </li> <li> <a href="/en-US/questions/topic/browse" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "browse" }'> Browse </a> </li> </ul> </section> </div> </div> </div> </div> </li> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title sumo-nav--link" href="/en-US/questions/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-help">Ask a Question</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-help"> <div class="sumo-nav--dropdown-container"> <div class="sumo-nav--dropdown-grid"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-example">Close Firefox menu </button> <div class="sumo-nav--dropdown"> <section class="mzp-c-menu-item mzp-has-icon sumo-nav--dropdown-item"> <div class="mzp-c-menu-item-head"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <g stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"> <path d="M11 3H4a2 2 0 00-2 2v12a2 2 0 002 2h9l2 4 2-4h2a2 2 0 002-2v-6" /> <path d="M17.5 2.5a2.121 2.121 0 013 3L13 13l-4 1 1-4 7.5-7.5z" /> </g> </svg> <h4 class="mzp-c-menu-item-title">Get help with</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist-aaq"> <li> <a href="/en-US/questions/new/desktop" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "desktop" }'> Firefox desktop </a> </li> <li> <a href="/en-US/questions/new/firefox-enterprise" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "firefox-enterprise" }'> Firefox for Enterprise </a> </li> <li> <a href="/en-US/questions/new/relay" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "relay" }'> Firefox Relay </a> </li> <li> <a href="/en-US/questions/new/thunderbird" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "thunderbird" }'> Thunderbird </a> </li> <li> <a href="/en-US/questions/new/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "ios" }'> Firefox for iOS </a> </li> <li> <a href="/en-US/questions/new/focus" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "focus" }'> Firefox Focus </a> </li> <li> <a href="/en-US/questions/new/monitor" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "monitor" }'> Monitor </a> </li> <li> <a href="/en-US/questions/new/mozilla-account" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "mozilla-account" }'> Mozilla Account </a> </li> <li> <a href="/en-US/questions/new/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "mobile" }'> Firefox for Android </a> </li> <li> <a href="/en-US/questions/new/firefox-private-network-vpn" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "firefox-private-network-vpn" }'> Mozilla VPN </a> </li> <li> <a href="/en-US/questions/new/pocket" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "pocket" }'> Pocket </a> </li> <li> <a class="color-link" href="/en-US/questions/new" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-1", "link_detail": "view-all" }'> View all </a> </li> </ul> </section> </div> </div> </div> </div> </li> <li class="mzp-c-menu-category"> <a class="mzp-c-menu-title sumo-nav--link" href="/en-US/contribute" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.contribute.contribute-home"}'> Contribute </a> </li> </ul> </nav> </div> </div> <div class="mzp-c-navigation-items sumo-nav--list-wrap-right logged-out" id="profile-navigation"> <div class="mzp-c-navigation-menu"> <nav class="mzp-c-menu mzp-is-basic"> <ul class="mzp-c-menu-category-list sumo-nav--list"> <li class="mzp-c-menu-category sumo-nav--item-right"> <form data-instant-search="form" id="support-search" action="/en-US/search/" method="get" class="simple-search-form"> <input type="hidden" name="product" value="firefox" /> <input spellcheck="true" type="search" autocomplete="off" name="q" aria-required="true" placeholder="Search questions, articles, or topics (example: saving passwords in Firefox)" class="searchbox" id="search-q" /> <button type="submit" title="Search" class="search-button">Search</button> </form> </li> <li class="mzp-c-menu-category logged-out-button-row "> <a rel="nofollow" href="/en-US/users/auth" class="sumo-button secondary-button button-lg" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.sign-in-up"}'> Sign In/Up </a> </li> </ul> </nav> </div> </div> <div class="mzp-c-navigation-items sumo-nav--mobile-search-form" id="search-navigation"> <div class="mzp-c-navigation-menu"> <nav class="mzp-c-menu mzp-is-basic"> <form data-instant-search="form" id="mobile-search-results" action="/en-US/search/" method="get" class="simple-search-form"> <input type="hidden" name="product" value="firefox" /> <input spellcheck="true" type="search" autocomplete="off" name="q" aria-required="true" placeholder="Search questions, articles, or topics (example: saving passwords in Firefox)" class="searchbox" id="search-q" /> <button type="submit" title="Search" class="search-button">Search</button> </form> </nav> </div> </div> </div> </div> </header>  <div class="home-search-section sumo-page-section--lg shade-bg hidden-search-masthead"> <div class="mzp-l-content narrow"> <div class="home-search-section--content"> <h4 class="sumo-page-heading-xl">Search Support</h4> <form data-instant-search="form" id="hidden-search" action="/en-US/search/" method="get" class="simple-search-form"> <input type="hidden" name="product" value="firefox" /> <input spellcheck="true" type="search" autocomplete="off" name="q" 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{"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}]}, "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}]}} </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> </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/smartblock-enhanced-tracking-protection/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='9QlGxlCeyNrnPbpCGaVKzpvNqiDEMCmnq5qyDSldcFyRwGxnQP7o1xi5lAGToWPW' /> <h4 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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">SmartBlock for Enhanced Tracking Protection</h1> </div> </header> <article class="wiki-doc"> <div id="document_metadata" class="has-border-bottom"> <span class="product tooltip-container"> Firefox <span class="tooltip">Firefox</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="2022-07-10T02:10:18-07:00">7/10/22</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">69%</span> of users voted this helpful </span> </div> <section id="doc-content" class="document--content "> <p><a href="https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/">SmartBlock</a> stands in for common tracking scripts, which are blocked by <a href="/en-US/kb/private-browsing-use-firefox-without-history">private browsing mode</a> and <a href="/en-US/kb/enhanced-tracking-protection-firefox-desktop#w_adjust-your-global-enhanced-tracking-protection-settings">strict tracking protection</a>. By doing so, it lets pages load more fully, with less breakage, without you having to do anything — all while keeping those tracking scripts blocked. </p><p>The difference can be dramatic: </p> <dl><dt><img alt="Smartblock off" class="wiki-image frameless lazy" data-original-src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2021-03-16-12-13-52-8d8508.png" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/placeholder.688345f843bb37ed.gif" width="400"><img alt="Smartblock on" class="wiki-image frameless lazy" data-original-src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2021-03-16-12-14-49-5b9cd4.png" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/placeholder.688345f843bb37ed.gif" width="400"> </dt></dl> <h1 id="w_log-in-with-facebook-when-you-visit-third-party-sites">Log in with Facebook when you visit third-party sites</h1> <p>SmartBlock lets you log in with your Facebook account when visiting third-party sites in Private Browsing Mode without compromising your privacy while avoiding website breakages. Just click the Facebook login button to log in as you normally would, and SmartBlock will allow only the required Facebook scripts, only when you log in by clicking the login button, and will only allow them for that website. </p> <h1 id="w_disabling-smartblock">Disabling SmartBlock</h1> <p>If you're a website developer or advanced user and you wish to disable SmartBlock, you may do so from the <a href="/en-US/kb/about-config-editor-firefox">Firefox Configuration Editor</a> (about:config page): </p><div class="warning"><strong>Warning:</strong> These instructions are for experienced Firefox users. Changing settings in the <a href="/en-US/kb/about-config-editor-firefox">Configuration Editor</a> (<em>about:config</em>) can have serious effects on your browser’s stability, security and performance. <br><strong>Only proceed if you are comfortable with advanced settings and understand the potential impacts</strong>.</div> <p></p> <ol><li>Type <strong>about:config</strong> in the <a href="/en-US/kb/search-firefox-address-bar">address bar</a> and press <span class="for" data-for="win,linux"><span class="key">Enter</span></span><span class="for" data-for="mac"><span class="key">Return</span></span>.<br>A warning page may appear. Click <span class="button">Accept the Risk and Continue</span> to go to the <em>about:config</em> page. </li><li>Find the <span class="pref">extensions.webcompat.enable_shims</span> preference. </li><li>Click the <em>Toggle</em> <img alt="Fx71aboutconfig-ToggleButton" class="wiki-image frameless lazy" data-original-src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2019-10-29-08-56-36-b0ab10.png" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/placeholder.688345f843bb37ed.gif" title=""> button next to the preference to set it to <span class="pref">false</span>. </li></ol> </section> <p class="share-link"> <br/> Share this article: <a href="https://mzl.la/3JJ85oe">https://mzl.la/3JJ85oe</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/smartblock-enhanced-tracking-protection/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='9QlGxlCeyNrnPbpCGaVKzpvNqiDEMCmnq5qyDSldcFyRwGxnQP7o1xi5lAGToWPW' /> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"> <input type="hidden" name="revision_id" value="247551" /> <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/underpass/">Underpass</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/heyjoni/">Joni</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/Fabi.L/">Fabi</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/-elison-/">-elison-</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/denyshon/">Denys</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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