Reset Firefox preferences to troubleshoot and fix problems

<!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="reset-preferences-fix-problems" data-ga-article-locale="en-US" data-ga-topics="/procedures-diagnose-and-fix-problems/" data-ga-products="/firefox/" > <head>   <script src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/gtm-snippet.1c0037a49b66fb06.js" nonce="zO5sU2eFEzJSp5V1bL26LQ=="></script>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title> Reset Firefox preferences to troubleshoot and fix problems | 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" 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="zO5sU2eFEzJSp5V1bL26LQ=="> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/620.c017de8a3c1e20cf.js" nonce="zO5sU2eFEzJSp5V1bL26LQ=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.a856f1c1afbd9b67.js" nonce="zO5sU2eFEzJSp5V1bL26LQ=="></script> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/566.de80f82c1815ff6e.js" nonce="zO5sU2eFEzJSp5V1bL26LQ=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/467.e805b3b5a73440ca.js" nonce="zO5sU2eFEzJSp5V1bL26LQ=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/document.58bdb8f917cf5fd3.js" nonce="zO5sU2eFEzJSp5V1bL26LQ=="></script> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.fx.download.6e0d6173cf4fde5d.js" nonce="zO5sU2eFEzJSp5V1bL26LQ=="></script> <meta name="description" content="When troubleshooting Firefox problems, resetting user preferences can be helpful in pinpointing the issue. This article explains how to do it."/> <meta name="google-site-verification" content="2URA-2Y9BeYYUf8B2BSsBSVetJJS3TZwlXBOaMx2VfY" /> <meta name="google-site-verification" content="ueNbCgS4e1JIAgLGwufm-jHaIcLXFLtFMmR_65S1Ag0" /> <meta name="msvalidate.01" content="1659173DC94819093068B0ED7C51C527" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> <link rel="canonical" href="https://support.mozilla.org/en-US/kb/reset-preferences-fix-problems" /> </head> <body class="html-ltr logged-out responsive document en-US" data-readonly="false" data-usernames-api="/en-US/users/api/usernames" data-messages-api="/en-US/messages/api/autocomplete" data-media-url="https://assets-prod.sumo.prod.webservices.mozgcp.net/" data-document-id="651" > <ul class="sumo-nav-access" id="nav-access"> <li><a href="#main-content">Skip to main content</a></li> <li><a href="/en-US/locales">Switch language</a></li> <li><a id="skip-to-search" 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</li> <li> <a href="/en-US/products/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-for-ios.product-home", "link_detail": "ios" }'> Firefox for iOS </a> </li> <li> <a href="/en-US/products/thunderbird" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.thunderbird.product-home", "link_detail": "thunderbird" }'> Thunderbird </a> </li> <li> <a href="/en-US/products/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-for-android.product-home", "link_detail": "mobile" }'> Firefox for Android </a> </li> <li> <a class="color-link" href="/en-US/products/" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.browse-all-articles.list-products"}'> View all products </a> </li> </ul> </section> </div> <div class="sumo-nav--dropdown-col"> <section class="mzp-c-menu-item mzp-has-icon sumo-nav--dropdown-item"> <div class="mzp-c-menu-item-head"> <svg 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"link_detail": "email-and-messaging" }'> Email and messaging </a> </li> <li> <a href="/en-US/topics/performance-and-connectivity" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "performance-and-connectivity" }'> Performance and connectivity </a> </li> <li> <a href="/en-US/topics/privacy-and-security" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "privacy-and-security" }'> Privacy and security </a> </li> <li> <a href="/en-US/topics/browse" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-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="#" aria-haspopup="true" aria-controls="mzp-c-menu-panel-tools">Community Forums</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-tools"> <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-col"> <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="M17 17l-1.051 3.154a1 1 0 01-1.898 0L13 17H5a2 2 0 01-2-2V5a2 2 0 012-2h14a2 2 0 012 2v10a2 2 0 01-2 2h-2zM7 8h10M7 12h10" /> </g> </svg> <h4 class="mzp-c-menu-item-title">Browse by product</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/en-US/questions/firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "desktop" }'> Firefox desktop </a> </li> <li> <a href="/en-US/questions/focus-firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "focus" }'> Firefox Focus </a> </li> <li> <a href="/en-US/questions/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "ios" }'> Firefox for iOS </a> </li> <li> <a href="/en-US/questions/thunderbird" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "thunderbird" }'> Thunderbird </a> </li> <li> <a href="/en-US/questions/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "mobile" }'> Firefox for Android </a> </li> <li> <a class="color-link" href="/en-US/questions/" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "view-all-home" }'> View all forums </a> </li> </ul> </section> </div> <div class="sumo-nav--dropdown-col"> <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"> <path d="M10.5 9.5L3 17c-1 1.667-1 3 0 4s2.333.833 4-.5l7.5-7.5c2.333 1.054 4.333.734 6-.96 1.667-1.693 1.833-3.707.5-6.04l-3 3-2.5-.5L15 6l3-3c-2.333-1.333-4.333-1.167-6 .5-1.667 1.667-2.167 3.667-1.5 6z" stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round" /> </svg> <h4 class="mzp-c-menu-item-title">Browse all forum threads by topic</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/en-US/questions/topic/settings" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "settings" }'> Settings </a> </li> <li> <a href="/en-US/questions/topic/installation-and-updates" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "installation-and-updates" }'> Installation and updates </a> </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" 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> </div> </div> </div> <div class="mzp-l-content " id="main-content"> <div class="sumo-page-section--inner"> <div class="breadcrumbs" id="main-breadcrumbs"> <ol id="breadcrumbs" class="breadcrumbs--list"> <li><a href="/en-US/">Home</a></li> <li><a href="/en-US/products/firefox">Firefox</a></li> <li><a href="/en-US/products/firefox/fix-problems/procedures-diagnose-and-fix-problems">Procedures to diagnose and...</a></li> <li>Reset Firefox preferences to...</li> </ol> </div> <div 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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}], "versions": {"firefox": [{"name": "Version 134", "slug": "fx134", "product": "firefox", "default": false, "min_version": 134.0, "max_version": 135.0, "visible": true}, {"name": "Version 133", "slug": "fx133", "product": "firefox", "default": false, "min_version": 133.0, "max_version": 134.0, "visible": true}, {"name": "Version 132", "slug": "fx132", "product": "firefox", "default": true, "min_version": 132.0, "max_version": 133.0, "visible": true}, {"name": "Version 131", "slug": "fx131", "product": "firefox", "default": false, "min_version": 131.0, "max_version": 132.0, "visible": true}, {"name": "Version 130", "slug": "fx130", "product": "firefox", "default": false, "min_version": 130.0, "max_version": 131.0, "visible": true}, {"name": "Version 129", "slug": "fx129", "product": "firefox", "default": false, "min_version": 129.0, "max_version": 130.0, "visible": true}, {"name": "Version 128", "slug": "fx128", "product": "firefox", "default": false, "min_version": 128.0, "max_version": 129.0, "visible": true}, {"name": "Version 127", "slug": "fx127", "product": "firefox", "default": false, "min_version": 127.0, "max_version": 128.0, "visible": true}, {"name": "Version 126", "slug": "fx126", "product": "firefox", "default": false, "min_version": 126.0, 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"visible": false}, {"name": "Version 13", "slug": "fx13", "product": "firefox", "default": false, "min_version": 13.0, "max_version": 14.0, "visible": false}, {"name": "Version 12", "slug": "fx12", "product": "firefox", "default": false, "min_version": 12.0, "max_version": 13.0, "visible": false}, {"name": "Version 11", "slug": "fx11", "product": "firefox", "default": false, "min_version": 11.0, "max_version": 12.0, "visible": false}, {"name": "Version 10 (ESR)", "slug": "fx10", "product": "firefox", "default": false, "min_version": 10.0, "max_version": 11.0, "visible": false}, {"name": "Version 9", "slug": "fx9", "product": "firefox", "default": false, "min_version": 9.0, "max_version": 10.0, "visible": false}, {"name": "Version 8", "slug": "fx8", "product": "firefox", "default": false, "min_version": 8.0, "max_version": 9.0, "visible": false}, {"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}]}, "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/reset-preferences-fix-problems/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='6f8yyIeP4jkX7PeQ90g0NCqvAkjNcbHRwFRGbydPtW1iVrrsvvgFGm564Osg4SVS' /> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"> <input type="hidden" name="revision_id" value="187626" /> <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">Reset Firefox preferences to troubleshoot and fix problems</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="2019-09-16T02:09:38-07:00">9/16/19</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">33%</span> of users voted this helpful </span> </div> <section id="doc-content" class="document--content "> <p>Resetting preferences (zoom, tabs, privacy, network, encryption, updates, where to save file downloads, etc.) is one of many procedures that can be helpful in <a href="/en-US/kb/troubleshoot-and-diagnose-firefox-problems">troubleshooting Firefox problems</a>. We'll explain two ways to do this. </p> <ul><li>If changes to preference settings are not saved when you restart Firefox, see <a href="/en-US/kb/how-to-fix-preferences-wont-save">How to fix preferences that won't save</a>. </li></ul> <div id="toc"><h2>Table of Contents</h2><ul><li class="toclevel-1"><a href="#w_solution-1-refresh-firefox"><span class="tocnumber">1</span> <span class="toctext">Solution 1: Refresh Firefox</span></a></li><li class="toclevel-1"><a href="#w_solution-2-delete-firefox-preference-files"><span class="tocnumber">2</span> <span class="toctext">Solution 2: Delete Firefox preference files</span></a></li></ul></div> <h1 id="w_solution-1-refresh-firefox">Solution 1: Refresh Firefox</h1> <p>The refresh feature restores Firefox to its default state while saving your essential information. This solution will reset preferences but will also remove other customizations, including added <a href="/en-US/kb/find-and-install-add-ons-add-features-to-firefox">extensions and themes</a>. For more information, see <a href="/en-US/kb/refresh-firefox-reset-add-ons-and-settings">Refresh Firefox - reset add-ons and settings</a>. </p> <h1 id="w_solution-2-delete-firefox-preference-files">Solution 2: Delete Firefox preference files</h1> <ol><li><ul><li><span class="for" data-for="win,linux">Click the menu button <img alt="Fx89menuButton" class="wiki-image frameless lazy" data-original-src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2021-05-15-11-18-38-e5b736.png" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/placeholder.688345f843bb37ed.gif" title="">, click <span class="menu">Help</span> and select <span class="menu">More Troubleshooting Information</span>.</span><span class="for" data-for="mac">From the <span class="menu">Help</span> menu, select <span class="menu">More Troubleshooting Information</span>.</span> The <strong>Troubleshooting Information</strong> tab will open. </li><li>Under the <strong>Application Basics</strong> section next to <em><span class="for" data-for="not linux">Profile Folder</span><span class="for" data-for="linux">Profile Directory</span></em>, click <span class="button"><span class="for" data-for="win">Open Folder</span><span class="for" data-for="mac">Show in Finder</span><span class="for" data-for="linux">Open Directory</span></span>. <span class="for" data-for="mac">A window will open that contains your profile folder.</span><span class="for" data-for="win">Your profile folder will open.</span><span class="for" data-for="linux">Your profile folder will open.</span> </li></ul> <div class="note"><strong>Note:</strong> If you are unable to open or use Firefox, follow the instructions in <a href="/en-US/kb/profiles-where-firefox-stores-user-data#w_finding-your-profile-without-opening-firefox">Finding your profile without opening Firefox</a>.</div> </li><li><span class="for" data-for="win">Click the Firefox menu <img alt="Fx89menuButton" class="wiki-image frameless lazy" data-original-src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2021-05-15-11-18-38-e5b736.png" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/placeholder.688345f843bb37ed.gif" title=""> and select <span class="menu">Exit</span>.</span><span class="for" data-for="mac">Click the Firefox menu at the top of the screen and select <span class="menu">Quit Firefox</span>.</span><span class="for" data-for="linux">Click the Firefox menu <img alt="Fx89menuButton" class="wiki-image frameless lazy" data-original-src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2021-05-15-11-18-38-e5b736.png" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/placeholder.688345f843bb37ed.gif" title=""> and select <span class="menu">Quit</span>.</span> </li><li>Locate and delete the file <span class="filepath">prefs.js</span> (or rename it, for example, to <em>prefs.jsOLD</em>, to keep the old file as a backup). If you find more than one, a <span class="filepath">prefs.js.moztmp</span> file or a <span class="filepath">user.js</span> file, delete (or rename) these as well. </li><li>You can close the profile folder and open Firefox now. </li></ol> </section> <p class="share-link"> <br/> Share this article: <a href="http://mzl.la/10p7LOu">http://mzl.la/10p7LOu</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/reset-preferences-fix-problems/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='6f8yyIeP4jkX7PeQ90g0NCqvAkjNcbHRwFRGbydPtW1iVrrsvvgFGm564Osg4SVS' /> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"> <input type="hidden" name="revision_id" value="187626" /> <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/Chris_Ilias/">Chris Ilias</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/djst/">David Tenser</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/Tonnes/">Tonnes</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/Jan./">Jan.</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/Verdi/">Michael Verdi</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/Swarnava/">Swarnava Sengupta</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/upwinxp/">Lan</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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