{
    "version": "https:\/\/jsonfeed.org\/version\/1",
    "title": "Firefox Desktop Release Notes",
    "home_page_url": "https:\/\/www.mozilla.org\/en-US\/firefox\/",
    "feed_url": "https:\/\/rss-bridge.org\/bridge01\/?action=display&bridge=FirefoxReleaseNotesBridge&format=Json",
    "icon": "https:\/\/www.mozilla.org\/en-US\/firefox\/favicon.ico",
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    "items": [
        {
            "id": "4664bdab5b642f563ace0d86aa28fcd53c6a2543",
            "title": "Firefox Desktop 153.0 Release Note",
            "date_modified": "2026-07-20T22:00:00+00:00",
            "url": "https:\/\/www.mozilla.org\/en-US\/firefox\/\/notes\/",
            "content_html": "                                                                        <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"new\">                       <div class=\"mzp-l-sidebar fl-l-release-notes-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-microphone-true\" aria-hidden=\"true\" ><\/span>                             New                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article fl-l-release-notes-main\">                         <ul>                                         <li class=\"release-note\" id=\"note-791896\">     <div class=\"release-note-content\">       <p>High Dynamic Range (HDR) video playback is now available on Windows - this feature needs HDR mode enabled for the display in <em>Windows Settings - Display<\/em>. Laptop displays that only offer \"HDR video streaming\" are not supported at this time. Some videos recorded on phones in certain orientations are currently not shown as HDR.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791891\">     <div class=\"release-note-content\">       <p><a href=\"https:\/\/support.mozilla.org\/kb\/how-use-firefox-containers\">Containers<\/a> let you keep separate parts of your online life (work, shopping, personal, banking) logged into different accounts in the same browser window, but keep your cookies and ad tracking isolated inside each container.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791922\">     <div class=\"release-note-content\">       <p>Share any open page with a QR code. Right-click a tab, select <em>Share &gt; Generate QR Code<\/em>. Great for posters, invitations, banners, and other printed materials.<\/p> <p><img alt=\"Screenshot of a QR code generated for a page\" src=\"https:\/\/www.firefox.com\/media\/img\/firefox\/releasenotes\/note-images\/153_QR_code_small.png\"><\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791781\">     <div class=\"release-note-content\">       <p>It is now possible to merge multiple PDFs by dragging a PDF into the PDF sidebar.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791778\">     <div class=\"release-note-content\">       <p>It is now possible to add images as new pages within PDFs using the Firefox PDF editor.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791777\">     <div class=\"release-note-content\">       <p>Quickly pick and copy a color from any page by typing \"pick color\", \"color picker\", or \"eyedropper\" in the address bar and selecting the \"Pick a color\" quick action.<\/p> <p><img alt=\"Screenshot of the Pick Color quick action being triggered from the address bar\" src=\"https:\/\/www.firefox.com\/media\/img\/firefox\/releasenotes\/note-images\/153_pick_color_action.png\"><\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791730\">     <div class=\"release-note-content\">       <p>Added support for Apple's system-wide full-screen keyboard command (Globe-F).<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791776\">     <div class=\"release-note-content\">       <p>Firefox now verifies and displays <a href=\"https:\/\/en.wikipedia.org\/wiki\/Qualified_website_authentication_certificate\">Qualified Website Authentication Certificates<\/a> (QWACs) in accordance with eIDAS regulations.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791780\">     <div class=\"release-note-content\">       <p>Added improved support for videos with overlays so users can more easily access video actions from context menus.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791783\">     <div class=\"release-note-content\">       <p>Firefox now highlights the location permission icon in red whenever a website has access to your location. The permission icon is also now visible on search results pages where it was previously hidden.<\/p> <p><img alt=\"Screenshot of the red geolocation warning  in the address bar when the Geolocation API is being used\" src=\"https:\/\/www.firefox.com\/media\/img\/firefox\/releasenotes\/note-images\/153_geolocation_icon.png\"><\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791920\">     <div class=\"release-note-content\">       <p><a href=\"https:\/\/www.firefox.com\/smart-window\">Smart Window<\/a>:<\/p> <ul> <li>See and choose AI models directly from the Smart Window assistant.<\/li> <li>New Tab now includes a familiar address bar for typing websites and searching the web.<\/li> <\/ul> <p><img alt=\"Screenshot of a QR code generated for a page\" src=\"https:\/\/www.firefox.com\/media\/img\/firefox\/releasenotes\/note-images\/153_smart_window.png\"><\/p>                   <\/div>          <div class=\"release-note-progressive-rollout-indicator\">       <img loading=\"lazy\" src=\"https:\/\/www.firefox.com\/media\/img\/firefox\/releasenotes\/progressive.c155af30a9cf.svg\" alt=\"\">       <p>This feature is part of a progressive roll out.<\/p>       <details>         <summary>What is a progressive roll out?<\/summary>         <p>Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.<\/p>       <\/details>     <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                                              <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"labs\">                       <div class=\"mzp-l-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-experiments\" aria-hidden=\"true\" ><\/span>                             Firefox Labs                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article\">                         <ul>                                         <li class=\"release-note\" id=\"note-791743\">     <div class=\"release-note-content\">       <p>Firefox Labs can now be opened quickly by typing \"labs\" or \"experiment\" in the address bar and selecting the <em>Open Firefox Labs<\/em> quick action.<\/p> <p><img alt=\"Screenshot of the Firefox Labs quick action being triggered from the address bar\" src=\"https:\/\/www.firefox.com\/media\/img\/firefox\/releasenotes\/note-images\/153_labs_quickaction.png\"><\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791745\">     <div class=\"release-note-content\">       <p>Firefox now offers experimental support for the new <a href=\"https:\/\/jpegxl.info\/\">JPEG XL image format<\/a>, which generally provides better compression than WebP, JPEG, PNG, and GIF and is designed to supersede them. You can enable it from the <em>Firefox Labs<\/em> panel in <em>Settings<\/em>.<\/p>                   <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                                              <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"fixed\">                       <div class=\"mzp-l-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-checkmark\" aria-hidden=\"true\" ><\/span>                             Fixed                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article\">                         <ul>                                         <li class=\"release-note\" id=\"note-791907\">     <div class=\"release-note-content\">       <p>Various <a href=\"https:\/\/www.mozilla.org\/security\/advisories\/mfsa2026-68\/\">security fixes<\/a>.<\/p>                   <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                                              <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"changed\">                       <div class=\"mzp-l-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-list\" aria-hidden=\"true\" ><\/span>                             Changed                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article\">                         <ul>                                         <li class=\"release-note\" id=\"note-791784\">     <div class=\"release-note-content\">       <p>Extensions can no longer access local files by default. Users can grant or revoke this access via the new \"Access local files on your computer\" permission, separate from \"Access your data for all websites\".<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791893\">     <div class=\"release-note-content\">       <p>Local Network Access restrictions are now enabled by default for all users. Firefox requires websites to request permission before connecting to devices on your local network or to apps and services on your device.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791894\">     <div class=\"release-note-content\">       <p>Outdated cookie settings have been removed from the Settings UI. Users still in that mode should switch to default behavior \"Isolate cross-site cookies\". <a href=\"https:\/\/groups.google.com\/a\/mozilla.org\/g\/firefox-dev\/c\/dXvMLkzyFqM\">More information<\/a><\/p>                   <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                                              <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"enterprise\">                       <div class=\"mzp-l-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-organizational-unit\" aria-hidden=\"true\" ><\/span>                             Enterprise                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article\">                         <ul>                                         <li class=\"release-note\" id=\"note-791919\">     <div class=\"release-note-content\">       <p>You can find information about policy updates and enterprise-specific bug fixes in the <a href=\"https:\/\/support.mozilla.org\/kb\/firefox-enterprise-153-release-notes\">Firefox for Enterprise 153 Release Notes<\/a>.<\/p>                   <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                                                                                                    <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"developer\">                       <div class=\"mzp-l-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-window-firefox\" aria-hidden=\"true\" ><\/span>                             Developer                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article\">                         <ul>                                         <li class=\"release-note\" id=\"note-mdn\">     <div class=\"release-note-content\">       <a class=\"mdn-icon\" rel=\"external\" href=\"https:\/\/developer.mozilla.org\/docs\/Mozilla\/Firefox\/Releases\/153\">Developer Information<\/a>                   <\/div>        <\/li>                                                                                                 <li class=\"release-note\" id=\"note-791892\">     <div class=\"release-note-content\">       <p>A new \"Local Mode\" setting in the options panel allows developers to load local directories via custom origins. This simplifies testing for APIs that do not function over standard <code>file:\/\/<\/code> URLs, removing the need to run a local web server. Multiple directory mappings are supported.<\/p>                   <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                                              <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"html5\">                       <div class=\"mzp-l-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-globe\" aria-hidden=\"true\" ><\/span>                             Web Platform                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article\">                         <ul>                                         <li class=\"release-note\" id=\"note-791707\">     <div class=\"release-note-content\">       <p>Firefox now supports a limited subset of the non-standard <code>::-webkit-scrollbar<\/code> pseudo-element to improve web compatibility:<\/p> <ul> <li>Rules with non-zero <code>width<\/code>\/<code>height<\/code> disable overlay scrollbars for the affected container.<\/li> <li><code>display: none<\/code> on <code>::-webkit-scrollbar<\/code> behaves like <code>scrollbar-width: none<\/code>, hiding the scrollbar.<\/li> <li><code>@supports selector(::-webkit-scrollbar)<\/code> now evaluates to true.<\/li> <li>Full styling capabilities (colors, border-radius, etc.) are intentionally not supported.<\/li> <\/ul>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791741\">     <div class=\"release-note-content\">       <p>The <code>vertical-align<\/code> property was converted into a shorthand for <code>baseline-source<\/code>, <code>alignment-baseline<\/code>, and <code>baseline-shift<\/code> in Firefox 149. Now, <code>alignment-baseline<\/code> supports the new keywords <code>alphabetic<\/code>, <code>ideographic<\/code>, <code>central<\/code>, <code>mathematical<\/code>, and <code>hanging<\/code>, extending the variety of <a href=\"https:\/\/developer.mozilla.org\/docs\/Web\/CSS\/Reference\/Properties\/alignment-baseline\">baselines to choose for alignment<\/a>.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791744\">     <div class=\"release-note-content\">       <p>Implemented the new <code>popover=hint<\/code> spec, which <a href=\"https:\/\/github.com\/whatwg\/html\/issues\/12304\">removes<\/a> a series of inconsistent and unexpected behaviors.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791760\">     <div class=\"release-note-content\">       <p>The <a href=\"https:\/\/developer.mozilla.org\/docs\/Web\/CSS\/Reference\/Values\/basic-shape\/circle\">circle()<\/a> and <a href=\"https:\/\/developer.mozilla.org\/docs\/Web\/CSS\/Reference\/Values\/basic-shape\/ellipse\">ellipse()<\/a> functions accept two new keywords <code>closest-corner<\/code> and <code>farthest-corner<\/code> for their radial size.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791762\">     <div class=\"release-note-content\">       <p>The newly added <a href=\"https:\/\/developer.mozilla.org\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Error\/stackTraceLimit\">Error.stackTraceLimit<\/a> property allows to set the maximal depth of the captured JavaScript error stack as a performance optimization.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791763\">     <div class=\"release-note-content\">       <p>Developers can now use the <code>text<\/code> import attribute to <a href=\"https:\/\/developer.mozilla.org\/docs\/Web\/JavaScript\/Reference\/Statements\/import\/with#text_modules_type_text\">import text files<\/a> using the module system.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791768\">     <div class=\"release-note-content\">       <p>The <a href=\"https:\/\/developer.mozilla.org\/docs\/Web\/API\/Picture-in-Picture_API\">Picture In Picture API<\/a> exposes a way for web developers to make use of user agent Picture-In-Picture functionality.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791779\">     <div class=\"release-note-content\">       <p>The <code>Intl.LocaleInfo<\/code> proposal adds the ability to query <a href=\"https:\/\/developer.mozilla.org\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Intl\/Locale#instance_methods\">Locale information<\/a>, such as week data (first day in a week, weekend start day, weekend end day), text direction and hour cycle used in the Locale.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791834\">     <div class=\"release-note-content\">       <p>The <code>MediaCapabilities.decodingInfo()<\/code> and <code>MediaCapabilities.encodingInfo()<\/code> methods now accept the \"webrtc\" configuration type. This allows a site to query whether a given audio or video configuration can be decoded or encoded for WebRTC and whether doing so will be smooth and\/or powerEfficient.<\/p>                   <\/div>        <\/li>                                                                              <li class=\"release-note\" id=\"note-791935\">     <div class=\"release-note-content\">       <p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc9842\/\">HTTP Compression Dictionaries<\/a> is enabled via rollout in 153, it will be made permanent in a future release.\u00a0 This can greatly reduce network traffic size for sites that use it.<\/p>                   <\/div>          <div class=\"release-note-progressive-rollout-indicator\">       <img loading=\"lazy\" src=\"https:\/\/www.firefox.com\/media\/img\/firefox\/releasenotes\/progressive.c155af30a9cf.svg\" alt=\"\">       <p>This feature is part of a progressive roll out.<\/p>       <details>         <summary>What is a progressive roll out?<\/summary>         <p>Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.<\/p>       <\/details>     <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                                                                                                    <div class=\"mzp-l-content mzp-has-sidebar mzp-l-sidebar-left fl-l-release-notes-with-sidebar\" id=\"community\">                       <div class=\"mzp-l-sidebar\">                                                       <h3 class=\"fl-heading  fl-heading-xs\">                                <span class=\"fl-c-release-notes-heading\">                               <span class=\"fl-icon   fl-icon-avatar-signed-out\" aria-hidden=\"true\" ><\/span>                             Community Contributions                           <\/span>                            <\/h3>                        <\/div>                       <div class=\"mzp-l-main mzp-l-article\">                         <ul>                                         <li class=\"release-note\" id=\"note-791908\">     <div class=\"release-note-content\">       <p>With the release of Firefox 153, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 15 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:<\/p> <ul> <li>Alan Liu: <a href=\"https:\/\/bugzilla.mozilla.org\/2009570\">2009570<\/a><\/li> <li>Dineth De SIlva: <a href=\"https:\/\/bugzilla.mozilla.org\/2042443\">2042443<\/a><\/li> <li>Freya Arbjerg [:freyacodes]: <a href=\"https:\/\/bugzilla.mozilla.org\/2036767\">2036767<\/a><\/li> <li>Garbee: <a href=\"https:\/\/bugzilla.mozilla.org\/2045887\">2045887<\/a><\/li> <li>Jessica Foley: <a href=\"https:\/\/bugzilla.mozilla.org\/2041062\">2041062<\/a><\/li> <li>John ARNZEN: <a href=\"https:\/\/bugzilla.mozilla.org\/2046279\">2046279<\/a><\/li> <li>Max Emig [:maxe]: <a href=\"https:\/\/bugzilla.mozilla.org\/230112\">230112<\/a><\/li> <li>metamuffin: <a href=\"https:\/\/bugzilla.mozilla.org\/2045549\">2045549<\/a><\/li> <li>mtan: <a href=\"https:\/\/bugzilla.mozilla.org\/2039500\">2039500<\/a><\/li> <li>ozcoder: <a href=\"https:\/\/bugzilla.mozilla.org\/2020186\">2020186<\/a><\/li> <li>Pedram Yektamaram: <a href=\"https:\/\/bugzilla.mozilla.org\/2042437\">2042437<\/a>, <a href=\"https:\/\/bugzilla.mozilla.org\/2042438\">2042438<\/a>, <a href=\"https:\/\/bugzilla.mozilla.org\/2042440\">2042440<\/a>, <a href=\"https:\/\/bugzilla.mozilla.org\/2042441\">2042441<\/a>, <a href=\"https:\/\/bugzilla.mozilla.org\/2042442\">2042442<\/a><\/li> <li>Peter Lafreniere [:n8pjl]: <a href=\"https:\/\/bugzilla.mozilla.org\/2041463\">2041463<\/a><\/li> <li>Phone Khant Kyaw Swa: <a href=\"https:\/\/bugzilla.mozilla.org\/2008877\">2008877<\/a><\/li> <li>pullmana8: <a href=\"https:\/\/bugzilla.mozilla.org\/2031735\">2031735<\/a><\/li> <li>Ryan McCartney: <a href=\"https:\/\/bugzilla.mozilla.org\/2039853\">2039853<\/a><\/li> <\/ul>                   <\/div>        <\/li>                                             <\/ul>                       <\/div>                     <\/div>                                                                "
        }
    ]
}