Firefox ヘルプ

<!DOCTYPE html> <html class="no-js" lang="ja" dir="ltr" data-gtm-container-id="G-2VC139B3XV" data-ga-content-group="product-home" data-ga-products="/firefox/" > <head>   <script src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/gtm-snippet.1c0037a49b66fb06.js" nonce="oEEFz0Fy792lD0uO1egf2g=="></script>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>Firefox ヘルプ</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 サポート" href="/ja/search/xml"/> <link href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/screen.7c7f344f96f6c2a7.css" rel="stylesheet" nonce="oEEFz0Fy792lD0uO1egf2g=="> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/620.c017de8a3c1e20cf.js" nonce="oEEFz0Fy792lD0uO1egf2g=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.a856f1c1afbd9b67.js" nonce="oEEFz0Fy792lD0uO1egf2g=="></script> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.fx.download.6e0d6173cf4fde5d.js" nonce="oEEFz0Fy792lD0uO1egf2g=="></script> <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/ja/products/firefox" /> </head> <body class="html-ltr logged-out responsive product-landing ja" data-readonly="false" data-usernames-api="/ja/users/api/usernames" data-messages-api="/ja/messages/api/autocomplete" data-media-url="https://assets-prod.sumo.prod.webservices.mozgcp.net/" data-product-slug="firefox" > <ul class="sumo-nav-access" id="nav-access"> <li><a href="#main-content">メインコンテンツへスキップ</a></li> <li><a href="/ja/locales">表示言語を切り替える</a></li> <li><a id="skip-to-search" href="#search-q">検索結果へスキップ</a></li> </ul> <div class="media-test"></div> <div id="announcements"> <div id="announce-geoip-suggestion" class="mzp-c-notification-bar mzp-t-warning"> <button class="mzp-c-notification-bar-button close-button" data-close-id="announce-geoip-suggestion" type="button" data-close-memory="remember" data-close-type="remove" > </button> <p></p> </div> </div> <header class="mzp-c-navigation sumo-nav"> <div class="mzp-c-navigation-l-content"> <div class="sumo-nav--container"> <div class="sumo-nav--logo"> <a href="/ja/"><img src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/mozilla-support.c4f961a8d7b1d501.svg" alt="Mozilla Support Logo"/></a> </div> <button data-mobile-nav-search-button class="sumo-nav--search-button" type="button">Search</button> <button data-sumo-toggle-nav="#main-navigation" class="sumo-nav--toggle-button" type="button" aria-controls="main-navigation">Menu</button> <a class="sumo-nav--avatar-button" data-sumo-toggle-nav="#profile-navigation" aria-controls="profile-navigation" aria-role="button"> <img class="avatar" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/default-FFA-avatar.2f8c2a0592bda1c5.png" alt="Avatar for Username"> </a> <div class="mzp-c-navigation-items sumo-nav--list-wrap" id="main-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 mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title sumo-nav--link" href="/ja/questions/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-help">ヘルプ記事を閲覧する</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">Firefox メニューを閉じる</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 transform="translate(3 3)" stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round"> <rect stroke-linejoin="round" width="18" height="18" rx="2" /> <path d="M4 5h10M4 9h10M4 13h4" /> </g> </svg> <h4 class="mzp-c-menu-item-title">製品別に探す</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/ja/products/firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-browser.product-home", "link_detail": "firefox" }'> Firefox デスクトップ </a> </li> <li> <a href="/ja/products/firefox-private-network-vpn" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.mozilla-vpn.product-home", "link_detail": "firefox-private-network-vpn" }'> Mozilla VPN </a> </li> <li> <a href="/ja/products/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-for-ios.product-home", "link_detail": "ios" }'> iOS 版 Firefox </a> </li> <li> <a href="/ja/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="/ja/products/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-for-android.product-home", "link_detail": "mobile" }'> Android 版 Firefox </a> </li> <li> <a class="color-link" href="/ja/products/" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.browse-all-articles.list-products"}'> すべての製品を見る </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"> <g transform="translate(3 3)" stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round"> <rect stroke-linejoin="round" width="18" height="18" rx="2" /> <path d="M4 5h10M4 9h10M4 13h4" /> </g> </svg> <h4 class="mzp-c-menu-item-title">トピックで探す</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/ja/topics/settings" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "settings" }'> 設定 </a> </li> <li> <a href="/ja/topics/installation-and-updates" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "installation-and-updates" }'> Installation and updates </a> </li> <li> <a href="/ja/topics/email-and-messaging" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "email-and-messaging" }'> Email and messaging </a> </li> <li> <a href="/ja/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="/ja/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="/ja/topics/browse" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "browse" }'> 参照 </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">コミュニティフォーラム</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">Firefox メニューを閉じる</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">製品を選択</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/ja/questions/firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "desktop" }'> Firefox デスクトップ </a> </li> <li> <a href="/ja/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="/ja/questions/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "ios" }'> iOS 版 Firefox </a> </li> <li> <a href="/ja/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="/ja/questions/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "mobile" }'> Android 版 Firefox </a> </li> <li> <a class="color-link" href="/ja/questions/" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "view-all-home" }'> すべてのフォーラムを見る </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="/ja/questions/topic/settings" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "settings" }'> 設定 </a> </li> <li> <a href="/ja/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="/ja/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="/ja/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="/ja/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="/ja/questions/topic/browse" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "browse" }'> 参照 </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="/ja/questions/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-help">フォーラムで質問する</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">Firefox メニューを閉じる </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="/ja/questions/new/desktop" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "desktop" }'> Firefox デスクトップ </a> </li> <li> <a href="/ja/questions/new/firefox-enterprise" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "firefox-enterprise" }'> 法人向け Firefox </a> </li> <li> <a href="/ja/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="/ja/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="/ja/questions/new/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "ios" }'> iOS 版 Firefox </a> </li> <li> <a href="/ja/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="/ja/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="/ja/questions/new/mozilla-account" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "mozilla-account" }'> Mozilla アカウント </a> </li> <li> <a href="/ja/questions/new/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "mobile" }'> Android 版 Firefox </a> </li> <li> <a href="/ja/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="/ja/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="/ja/questions/new" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-1", "link_detail": "view-all" }'> すべて見る </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="/ja/contribute" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.contribute.contribute-home"}'> 協力 </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="/ja/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="質問、記事、トピックスを検索してください (例: Firefox でパスワードを保存する)" class="searchbox" id="search-q" /> <button type="submit" title="検索" class="search-button">検索</button> </form> </li> <li class="mzp-c-menu-category logged-out-button-row "> <a rel="nofollow" href="/ja/users/auth" class="sumo-button secondary-button button-lg" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.sign-in-up"}'> 登録/ログイン </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="/ja/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="質問、記事、トピックスを検索してください (例: Firefox でパスワードを保存する)" class="searchbox" id="search-q" /> <button type="submit" title="検索" class="search-button">検索</button> </form> </nav> </div> </div> </div> </div> </header> <section class="home-search-section sumo-page-section extra-pad-bottom shade-bg"> <div class="mzp-l-content"> <div class="breadcrumbs" id="main-breadcrumbs"> <ol id="breadcrumbs" class="breadcrumbs--list"> <li><a href="/ja/">ホーム</a></li> <li>Firefox</li> </ol> </div> </div> <div class="mzp-l-content narrow"> <div class="home-search-section--content"> <h1 class="sumo-page-heading-xl"> <img class="page-heading--logo" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/products/2020-04-14-08-36-13-8dda6f.png" alt="Photo of Firefox" /> <span class="product-title-text">Firefox サポート</span> </h1> <form data-instant-search="form" id="support-search-masthead" action="/ja/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="質問、記事、トピックスを検索してください (例: Firefox でパスワードを保存する)" class="searchbox" id="search-q" /> <button type="submit" title="検索" class="search-button">検索</button> </form> <p class="popular-searches"> <span>よく検索されるキーワード:</span> <a href="#popular_search_1" data-featured-search>Firefox をアップデート</a> <a href="#popular_search_2" data-featured-search>プロファイル</a> <a href="#popular_search_3" data-featured-search>Firefox Sync</a> </p> </div> </div> </section> <div id="main-content"> <div class="mzp-l-content sumo-page-section--inner"> <div class="sumo-page-subheader"> <div class="sumo-page-subheader--text"> <div class="text-center-to-left-on-large"> <h2 class="sumo-page-subheading">よくあるトピック</h2> <p class="sumo-page-intro">ナレッジベースを探索する。</p> </div> </div> <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"> Firefox をダウンロード </a> <ul class="download-info text-body-xs"> <li><a href="https://www.mozilla.org/firefox/all/">システムと言語</a></li> <li><a href="https://www.mozilla.org/firefox/notes">新着情報</a></li> <li><a href="https://www.mozilla.org/legal/privacy/firefox">プライバシー</a></li> </ul> </div> </div> </div> </div> <div class="sumo-card-grid"> <div class="scroll-wrap"> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="Backup, recovery, and sync icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/backup-recovery-and-sync" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/backup-recovery-and-sync" }'> Backup, recovery, and sync </a> </h3> </div> </div> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="Browse icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/browse" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/browse" }'> Browse </a> </h3> </div> </div> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="Performance and connectivity icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/performance-and-connectivity" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/performance-and-connectivity" }'> Performance and connectivity </a> </h3> </div> </div> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="Installation and updates icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/installation-and-updates" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/installation-and-updates" }'> Installation and updates </a> </h3> </div> </div> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="設定 icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/settings" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/settings" }'> 設定 </a> </h3> </div> </div> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="プライバシーとセキュリティ icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/privacy-and-security" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/privacy-and-security" }'> プライバシーとセキュリティ </a> </h3> </div> </div> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="Passwords and sign in icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/passwords-and-sign-in" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/passwords-and-sign-in" }'> Passwords and sign in </a> </h3> </div> </div> <div class="card card--topic"> <img class="card--icon" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/topic_placeholder.80f7e273cb882074.png" alt="アカウント icon" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/products/firefox/accounts" data-on-hover="すべて表示" data-event-name="link_click" data-event-parameters='{ "link_name": "product-and-topic-home", "link_detail": "firefox/accounts" }'> アカウント </a> </h3> </div> </div> </div> </div> </div> <section class="support-callouts mzp-l-content sumo-page-section--inner"> <div class="card card--ribbon is-inverse heading-is-one-line"> <div class="card--details"> <h3 class="card--title"> <svg class="card--icon-sm" width="24px" height="24px" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"> <g stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"> <g transform="translate(2.000000, 1.878680)" stroke="#FFFFFF" stroke-width="2"> <path d="M9,1.12132031 L2,1.12132031 C0.8954305,1.12132031 5.32907052e-15,2.01675081 5.32907052e-15,3.12132031 L5.32907052e-15,15.1213203 C5.32907052e-15,16.2258898 0.8954305,17.1213203 2,17.1213203 L11,17.1213203 L13,21.1213203 L15,17.1213203 L17,17.1213203 C18.1045695,17.1213203 19,16.2258898 19,15.1213203 L19,9.12132031"></path> <path d="M15.5,0.621320312 C16.3284271,-0.207106783 17.6715729,-0.207106769 18.5,0.621320344 C19.3284271,1.44974746 19.3284271,2.79289318 18.5,3.62132031 L11,11.1213203 L7,12.1213203 L8,8.12132031 L15.5,0.621320312 Z"></path> </g> </g> </svg> ヘルプが必要ですか？ </h3> <p class="card--desc"> サポートフォーラムに質問を投稿して、専門家のコミュニティからの回答を得ましょう。 </p> <a class="sumo-button primary-button button-lg" href="/ja/questions/new/firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "aaq-banner.aaq-step-2", "link_detail": "firefox" }'> コミュニティに尋ねる </a> </div> </div> </section> <section class="mzp-l-content mzp-l-content sumo-page-section--inner"> <h2 class="sumo-page-subheading text-center-to-left-on-large">注目記事</h2> <div class="sumo-card-grid is-four-wide"> <div class="scroll-wrap"> <div class="card card--article zoom-on-hover"> <img class="card--icon-sm" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/reader-mode.1d40422a5274c27c.svg" alt="安全な接続ができませんでした" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/kb/secure-connection-failed-error-message" data-event-name="link_click" data-event-parameters='{"link_name": "featured.kb-article"}'> 安全な接続ができませんでした</a> </h3> <p class="card--desc"> ウェブサイトが安全な接続を要求してもそれを確立できない場合、Firefox は接続せずにエラーページを表示します。詳しく学びましょう。 </p> </div> </div> <div class="card card--article zoom-on-hover"> <img class="card--icon-sm" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/reader-mode.1d40422a5274c27c.svg" alt="安全なウェブサイトで時刻に関係したエラーのトラブルシューティング方法" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/kb/troubleshoot-time-errors-secure-websites" data-event-name="link_click" data-event-parameters='{"link_name": "featured.kb-article"}'> 安全なウェブサイトで時刻に関係したエラーのトラブルシューティング方法</a> </h3> <p class="card--desc"> HTTPS ウェブサイト上で時刻に関係したエラーが表示される理由と、システムの時計を正しく設定して問題を解決する方法を学んでください。 </p> </div> </div> <div class="card card--article zoom-on-hover"> <img class="card--icon-sm" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/reader-mode.1d40422a5274c27c.svg" alt="安全でないページのパスワードフィールドで警告される" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/kb/insecure-password-warning-firefox" data-event-name="link_click" data-event-parameters='{"link_name": "featured.kb-article"}'> 安全でないページのパスワードフィールドで警告される</a> </h3> <p class="card--desc"> Firefox は、ログインフォームが安全でなく、入力した情報が盗み取られる可能性がある場合に警告します。 </p> </div> </div> <div class="card card--article zoom-on-hover"> <img class="card--icon-sm" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/reader-mode.1d40422a5274c27c.svg" alt="プライベートブラウジングによくある誤解" /> <div class="card--details"> <h3 class="card--title"> <a class="expand-this-link" href="/ja/kb/common-myths-about-private-browsing" data-event-name="link_click" data-event-parameters='{"link_name": "featured.kb-article"}'> プライベートブラウジングによくある誤解</a> </h3> <p class="card--desc"> Firefox のプライベートブラウジングについてよくある誤解について学んでください。 </p> </div> </div> </div> </div> </section> <section class="mzp-l-content mzp-l-content sumo-page-section--inner"> <div class="card card--callout is-full-width has-moz-headings"> <div 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<option value="ur" >اُردو</option> <option value="vi" >Tiếng Việt</option> <option value="wo" >Wolof</option> <option value="xh" >isiXhosa</option> <option value="yo" >èdè Yorùbá</option> <option value="zh-CN" >中文 (简体)</option> <option value="zh-TW" >正體中文 (繁體)</option> <option value="zu" >isiZulu</option> </select>  <button type="submit">移動</button> </form> <ul class="mzp-c-footer-links-social"> <li><a class="twitter" href="https://twitter.com/firefox">Twitter<span>(@firefox)</span></a></li> <li><a class="youtube" href="https://www.youtube.com/firefoxchannel">YouTube<span> (firefoxchannel)</span></a></li> <li><a class="instagram" href="https://www.instagram.com/firefox">Instagram<span> (firefox)</span></a></li> </ul> </section> </div> </nav> <nav class="mzp-c-footer-secondary"> <div class="mzp-c-footer-link-col"> <div class="mzp-c-footer-primary-logo"><a href="https://www.mozilla.org/">Mozilla</a></div> <div class="mzp-c-footer-legal"> <ul> <li><a 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