Manifest - Content Security Policy | Chrome Extensions

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class="devsite-search-field devsite-search-query" name="q" placeholder="Search" role="combobox" type="text" value="" > <div class="devsite-search-image material-icons" aria-hidden="true"> </div> <div class="devsite-search-shortcut-icon-container" aria-hidden="true"> <kbd class="devsite-search-shortcut-icon">/</kbd> </div> </div> </div> </form> <button type="button" search-close class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Close search"></button> </devsite-search> </div> <devsite-appearance-selector></devsite-appearance-selector> <devsite-language-selector> <ul role="presentation"> <li role="presentation"> <a role="menuitem" lang="en" >English</a> </li> <li role="presentation"> <a role="menuitem" lang="de" >Deutsch</a> </li> <li role="presentation"> <a role="menuitem" lang="es_419" >Español – América Latina</a> </li> <li role="presentation"> <a role="menuitem" lang="fr" >Français</a> </li> <li role="presentation"> <a role="menuitem" lang="id" >Indonesia</a> </li> <li role="presentation"> <a role="menuitem" lang="it" >Italiano</a> </li> <li role="presentation"> <a role="menuitem" lang="nl" >Nederlands</a> </li> <li role="presentation"> <a role="menuitem" lang="pl" >Polski</a> </li> <li role="presentation"> <a role="menuitem" lang="pt_br" >Português – Brasil</a> </li> <li role="presentation"> <a role="menuitem" lang="vi" >Tiếng Việt</a> </li> <li role="presentation"> <a role="menuitem" lang="tr" >Türkçe</a> </li> <li role="presentation"> <a role="menuitem" lang="ru" >Русский</a> </li> <li role="presentation"> <a role="menuitem" lang="he" >עברית</a> </li> <li role="presentation"> <a role="menuitem" lang="ar" >العربيّة</a> </li> <li role="presentation"> <a role="menuitem" lang="fa" >فارسی</a> </li> <li role="presentation"> <a role="menuitem" lang="hi" >हिंदी</a> </li> <li role="presentation"> <a role="menuitem" lang="bn" >বাংলা</a> </li> <li role="presentation"> <a role="menuitem" lang="th" >ภาษาไทย</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_tw" >中文 – 繁體</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <devsite-user enable-profiles id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>Sign in</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section "> <div class="devsite-header-background"> <div class="devsite-product-id-row" > <div class="devsite-product-description-row"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developer.chrome.com/docs/extensions" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Chrome Extensions" > Chrome Extensions </a> </li> </ul> </div> </div> <div class="devsite-doc-set-nav-row"> <devsite-tabs class="lower-tabs"> <nav class="devsite-tabs-wrapper" aria-label="Lower tabs"> <tab > <a href="https://developer.chrome.com/docs/extensions" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - overview" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Overview" track-name="overview" > Overview </a> </tab> <tab > <a href="https://developer.chrome.com/docs/extensions/get-started" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/get-started" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - get started" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Get Started" track-name="get started" > Get Started </a> </tab> <tab > <a href="https://developer.chrome.com/docs/extensions/develop" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/develop" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - develop" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Develop" track-name="develop" > Develop </a> </tab> <tab > <a href="https://developer.chrome.com/docs/extensions/how-to" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/how-to" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - how to" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: How To" track-name="how to" > How To </a> </tab> <tab > <a href="https://developer.chrome.com/docs/extensions/ai" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/ai" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - ai" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: AI" track-name="ai" > AI </a> </tab> <tab class="devsite-dropdown devsite-active "> <a href="https://developer.chrome.com/docs/extensions/reference" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/reference" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - reference" track-metadata-module="primary nav" aria-label="Reference, selected" data-category="Site-Wide Custom Events" data-label="Tab: Reference" track-name="reference" > Reference </a> <a href="#" role="button" aria-haspopup="true" aria-expanded="false" aria-label="Dropdown menu for Reference" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/reference" track-metadata-position="nav - reference" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Reference" track-name="reference" class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></a> <div class="devsite-tabs-dropdown" aria-label="submenu" hidden> <div class="devsite-tabs-dropdown-content"> <div class="devsite-tabs-dropdown-column "> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/docs/extensions/reference/api" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/reference/api" track-metadata-position="nav - reference" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> API </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/docs/extensions/reference/permissions-list" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/reference/permissions-list" track-metadata-position="nav - reference" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> Permissions </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/docs/extensions/reference/manifest" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/reference/manifest" track-metadata-position="nav - reference" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> Manifest </div> </a> </li> </ul> </div> </div> </div> </tab> <tab > <a href="https://developer.chrome.com/docs/extensions/samples" track-metadata-eventdetail="https://developer.chrome.com/docs/extensions/samples" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - samples" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Samples" track-name="samples" > Samples </a> </tab> <tab class="devsite-dropdown "> <a href="https://developer.chrome.com/docs/webstore" track-metadata-eventdetail="https://developer.chrome.com/docs/webstore" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - chrome web store" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Chrome Web Store" track-name="chrome web store" > Chrome Web Store </a> <a href="#" role="button" aria-haspopup="true" aria-expanded="false" aria-label="Dropdown menu for Chrome Web Store" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/webstore" track-metadata-position="nav - chrome web store" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Chrome Web Store" track-name="chrome web store" class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></a> <div class="devsite-tabs-dropdown" aria-label="submenu" hidden> <div class="devsite-tabs-dropdown-content"> <div class="devsite-tabs-dropdown-column "> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/docs/webstore/prepare" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/webstore/prepare" track-metadata-position="nav - chrome web store" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> Prepare your Extension </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/docs/webstore/publish" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/webstore/publish" track-metadata-position="nav - chrome web store" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> Publish in the Chrome Web Store </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/docs/webstore/program-policies" track-type="nav" track-metadata-eventdetail="https://developer.chrome.com/docs/webstore/program-policies" track-metadata-position="nav - chrome web store" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> Program Policies </div> </a> </li> </ul> </div> </div> </div> </tab> </nav> </devsite-tabs> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars > <div class="devsite-book-nav-filter" > <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span class="filter-clear-button hidden" data-title="Clear filter" aria-label="Clear filter" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <a href="/" class="devsite-site-logo-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Site logo" track-type="globalNav" track-name="chromeForDevelopers" track-metadata-position="nav" track-metadata-eventDetail="nav"> <picture> <source srcset="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/chrome/images/lockup-dark-theme.svg" media="(prefers-color-scheme: dark)" class="devsite-dark-theme" alt="Chrome for Developers"> <img src="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/chrome/images/lockup.svg" class="devsite-site-logo" alt="Chrome for Developers"> </picture> </a> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/case-studies" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Get inspired" track-name="get inspired" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Get inspired" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Get inspired </span> </a> </li> <li class="devsite-nav-item"> <a href="/blog" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Blog" track-name="blog" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Blog" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Blog </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs" class="devsite-nav-title gc-analytics-event devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Docs" track-name="docs" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Docs" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Docs </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Docs" track-name="docs" > <span class="devsite-nav-text" tooltip menu="Docs"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Docs"> </span> </span> </li> </ul> <ul class="devsite-nav-responsive-tabs"> <li class="devsite-nav-item"> <a href="/docs/extensions" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Overview" track-name="overview" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Overview" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Overview </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/get-started" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Get Started" track-name="get started" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Get Started" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Get Started </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/develop" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Develop" track-name="develop" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Develop" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Develop </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/how-to" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: How To" track-name="how to" data-category="Site-Wide Custom Events" data-label="Responsive Tab: How To" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > How To </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/ai" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: AI" track-name="ai" data-category="Site-Wide Custom Events" data-label="Responsive Tab: AI" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > AI </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/reference" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Reference" track-name="reference" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Reference" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip menu="_book"> Reference </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="_book"> </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu devsite-lower-tab-item"> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Reference" track-name="reference" > <span class="devsite-nav-text" tooltip menu="Reference"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Reference"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/samples" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Samples" track-name="samples" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Samples" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Samples </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/webstore" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Chrome Web Store" track-name="chrome web store" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Chrome Web Store" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Chrome Web Store </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu devsite-lower-tab-item"> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Chrome Web Store" track-name="chrome web store" > <span class="devsite-nav-text" tooltip menu="Chrome Web Store"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Chrome Web Store"> </span> </span> </li> </ul> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/new" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: New in Chrome" track-name="new in chrome" data-category="Site-Wide Custom Events" data-label="Responsive Tab: New in Chrome" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > New in Chrome </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest" ><span class="devsite-nav-text" tooltip>Manifest file format</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/shared-modules" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/shared-modules" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/shared-modules" ><span class="devsite-nav-text" tooltip>Shared modules</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/chrome-settings-override" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/chrome-settings-override" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/chrome-settings-override" ><span class="devsite-nav-text" tooltip>Overriding Chrome settings</span></a></li> <li class="devsite-nav-item devsite-nav-break"></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/author" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/author" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/author" ><span class="devsite-nav-text" tooltip>author</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/background" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/background" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/background" ><span class="devsite-nav-text" tooltip>background</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/content-scripts" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/content-scripts" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/content-scripts" ><span class="devsite-nav-text" tooltip>content_scripts</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/cross-origin-embedder-policy" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/cross-origin-embedder-policy" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/cross-origin-embedder-policy" ><span class="devsite-nav-text" tooltip>cross_origin_embedder_policy</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/content-security-policy" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/content-security-policy" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/content-security-policy" ><span class="devsite-nav-text" tooltip>content_security_policy</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/cross-origin-opener-policy" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/cross-origin-opener-policy" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/cross-origin-opener-policy" ><span class="devsite-nav-text" tooltip>cross_origin_opener_policy</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/description" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/description" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/description" ><span class="devsite-nav-text" tooltip>description</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/default-locale" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/default-locale" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/default-locale" ><span class="devsite-nav-text" tooltip>default_locale</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/event-rules" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/event-rules" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/event-rules" ><span class="devsite-nav-text" tooltip>event_rules</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/externally-connectable" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/externally-connectable" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/externally-connectable" ><span class="devsite-nav-text" tooltip>externally_connectable</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/file-handlers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, 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track-metadata-eventdetail="/docs/extensions/reference/manifest/incognito" ><span class="devsite-nav-text" tooltip>incognito</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/icons" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/icons" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/icons" ><span class="devsite-nav-text" tooltip>icons</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/input-components" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/input-components" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/input-components" ><span class="devsite-nav-text" tooltip>input_components</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/key" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/key" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/key" ><span class="devsite-nav-text" tooltip>key</span></a></li> <li class="devsite-nav-item"><a href="/docs/extensions/reference/manifest/manifest-version" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /docs/extensions/reference/manifest/manifest-version" track-type="bookNav" track-name="click" track-metadata-eventdetail="/docs/extensions/reference/manifest/manifest-version" ><span class="devsite-nav-text" tooltip>manifest_version</span></a></li> <li class="devsite-nav-item"><a 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<ul class="devsite-nav-list" menu="Reference" aria-label="Side menu" hidden> <li class="devsite-nav-item"> <a href="/docs/extensions/reference/api" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: API" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > API </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/reference/permissions-list" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Permissions" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Permissions </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions/reference/manifest" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Manifest" 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gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="Chrome Extensions" > Chrome Extensions </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developer.chrome.com/docs/extensions/reference" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="4" track-type="globalNav" track-name="breadcrumb" track-metadata-position="4" track-metadata-eventdetail="" > Reference </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <h1 class="devsite-page-title" tabindex="-1"> Manifest - Content Security Policy </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p>An optional manifest key containing a web platform <a href="https://developer.mozilla.org/docs/Web/HTTP/CSP">content security policy</a> which specifies restrictions on the scripts, styles, and other resources an extension can use. Within this manifest key, separate optional policies can be defined for both extension pages and sandboxed extension pages.</p> <p>The "extension pages" policy applies to page and worker contexts in the extension. This would include the extension popup, background worker, and tabs with HTML pages or iframes that were opened by the extension. The sandbox policy applies to all pages specified as a <a href="/docs/extensions/mv3/manifest/sandbox">sandbox page</a> in the manifest.</p> <h2 id="default_policy" data-text="Default Policy" tabindex="-1">Default Policy</h2> <p>If the content security policy is not defined by the user in the manifest, the default properties will be used for both extension pages and sandboxed extension pages.</p> <p>These defaults are equivalent to specifying the following policies in your manifest:</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="JSON"><code translate="no" dir="ltr"><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// ...</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">"content_security_policy"</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">"extension_pages"</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"script-src 'self'; object-src 'self';"</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">"sandbox"</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"sandbox allow-scripts allow-forms allow-popups allow-modals; script-src 'self' 'unsafe-inline' 'unsafe-eval'; child-src 'self';"</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// ...</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <p>In this case, the extension will only load local scripts and objects from its own packaged resources. WebAssembly will be disabled, and the extension won't run inline Javascript or be able to evaluate strings as executable code. If a sandbox page is added, it will have more relaxed permissions for evaluating scripts from outside the extension.</p> <h2 id="minimum_and_customized_content_security_policies" data-text="Minimum and customized Content Security Policies" tabindex="-1">Minimum and customized Content Security Policies</h2> <p>Developers may add or remove rules for their extension, or use the minimum required content security policy, to fit the needs of their project.</p> <h3 id="extension_pages_policy" data-text="Extension Pages Policy" tabindex="-1">Extension Pages Policy</h3> <p>Chrome enforces a minimum content security policy for extension pages. It is equivalent to specifying the following policy in your manifest:</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="JSON"><code translate="no" dir="ltr"><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// ...</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">"content_security_policy"</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">"extension_pages"</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"script-src 'self' 'wasm-unsafe-eval'; object-src 'self';"</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// ...</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <p>The <code translate="no" dir="ltr">extension_pages</code> policy cannot be relaxed beyond this minimum value. In other words, you cannot add other script sources to directives, such as adding <code translate="no" dir="ltr">'unsafe-eval'</code> to <code translate="no" dir="ltr">script-src</code>. If you add a disallowed source to your extension's policy, Chrome will throw an error like this at install time:</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="JSON"><code translate="no" dir="ltr"><span class="devsite-syntax-err">'co</span><span class="devsite-syntax-kc">ntent</span><span class="devsite-syntax-err">_securi</span><span class="devsite-syntax-kc">t</span><span class="devsite-syntax-err">y_policy.ex</span><span class="devsite-syntax-kc">tens</span><span class="devsite-syntax-err">io</span><span class="devsite-syntax-kc">n</span><span class="devsite-syntax-err">_pages'</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-err">I</span><span class="devsite-syntax-kc">nse</span><span class="devsite-syntax-err">cure</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-err">CSP</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-err">value</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s2">"'unsafe-eval'"</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-err">i</span><span class="devsite-syntax-kc">n</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-err">direc</span><span class="devsite-syntax-kc">t</span><span class="devsite-syntax-err">ive</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-err">'scrip</span><span class="devsite-syntax-kc">t</span><span class="devsite-syntax-mi">-</span><span class="devsite-syntax-err">src'.</span> </code></pre></devsite-code> <h3 id="sandbox_pages_policy" data-text="Sandbox Pages Policy" tabindex="-1">Sandbox Pages Policy</h3> <p>The default policy for sandboxed pages is much more lenient than with extension pages, as the sandbox page does not have access to extension APIs, or direct access to non-sandboxed pages. 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