Platform/Roadmap2025

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Platform 2025 Roadmap

Note: This page has in-progress sections.

Related Links:

• Firefox Release Calendar (future)
• Firefox release notes for developers (past)
• Pocket Guide: Shipping Firefox

These are areas of work planned for Gecko in 2025 for the Web Platform.

For current web platform documentation of these areas, see the subsections at:

• https://developer.mozilla.org/en-US/docs/Web/

HTML

• autocorrect attribute (1725806, 1927977)
• contenteditable=plain-text (1922724)
• <dialog> element support closedby attribute (1964078)
• hidden=until-found (1761043, 1955379)
• <script type=importmap> support integrity key (1945540)
• ...

CSS

• :has-slotted pseudo-class (1940691)
• :open pseudo-class (1936113)
• ::details-content pseudo-element (1901037)
• ::highlight pseudo-element (1964089)
• ::marker with before and after pseudo-elements, e.g. ::before::marker and ::after::marker (1980215)
• align-self, justify-self, place-self support for absolutely positioned elements (1920160)
• font-variant-emoji (1954214)
• hyphenate-limit-chars (1521723, 1947183)
• linear-gradient(), conic-gradient(), radial-gradient() support single color stop and 0-1 positions (1900530)
• text-autospace (1869577)
• text-decoration-line:spelling-error and grammar-error (1950844)
• view transitions features (1985809)
  • :active-view-transition pseudo-class
  • ::view-transition, ::view-transition-group(), ::view-transition-image-pair(), ::view-transition-new(), ::view-transition-old() pseudo-classes
  • view-transition-class and view-transition-name properties
• ...

CSSOM

• Highlight & HighlightRegistry (1964089)
• ...

SVG

• fetchpriority attribute (1847712)
• SVGPathElement methods getPathData(), setPathData(), getPathSegmentAtLength() (1945312)
• ...

Rendering

• WebGPU shipping on Windows in H1, Mac and Linux in H2.
• WebGPU external textures (1979100)
• ...

Media

• HEVC (H.265) hardware support on Android, and hardware and software support on Linux (1950032)
• RTCIceCandidatePairStats properties currentRoundTripTime, totalRoundTripTime, and responsesReceived properties (1371391)
• RTCInboundRtpStreamStats properties estimatedPlayoutTimestamp, framesAssembledFromMultiplePackets, freezeCount, jitterBufferMinimumDelay, jitterBufferTargetDelay, keyFramesDecoded, pauseCount, totalAssemblyTime, totalFreezesDuration, and totalPausesDuration properties (1926622)
• RTCOutboundRtpStreamStats properties mid & rid (1643001)
• WebRTC send and receive video encoded using AV1 codec - (1932065, 1944878)
• WebRTC simulcast of screen-shared video with H264 (1210175) and VP8 (1692873) codecs
• WebRTC support Dependency Descriptor (DD) RTP Header Extension (1945261)
• Support for downscaling and decimated frame rates.
• SVC support for desktop.
• WebCodecs support on Android.
• Platform hardware support for video encoding.
• ...

DOM

• < and > escaping in serialized HTML attributes (1962084)
  • Element.innerHTML, Element.outerHTML, Element.getHTML(), ShadowRoot.innerHTML, ShadowRoot.getHTML()
• Animation.overallProgress (1834878)
• beforematch event (1761043, 1955379)
• HTML Sanitizer API - (1950605, 1952250)
• HTMLDialogElement support requestClose() method (1960556), closedBy attribute (1964078)
• HTMLElement.autocorrect (1725806)
• HTMLElement showPopover() and togglePopover() methods support options.source, togglePopover() supports force and options.force argument (1936411)
• moveBefore() on the Element, DocumentFragment, Document (1983688)
• pointerrawupdate event (1550462)
• Prioritized Task Scheduling API (1966997)
• Selection.getComposedRanges() (1903870)
• ...

JS

• Atomics.pause() (1937805)
• Error.captureStackTrace() (1886820, 1950508)
• Error.isError() (1952249)
• Intl.DurationFormat (1648139, 1933303)
• JSON.parse() with source, JSON.isRawJSON() & JSON.rawJSON() (1934622)
• Math.sumPrecise() (1943120)
• Promise.try() (1905364, 1917879)
• RegExp.escape() (1918235)
• Resource Management API (1967744)
• Temporal API (1912511, 1946823, 1954138)
• variants accessor on Intl.Locale instances (1970161)
• ...

APIs

• Cookie Store API (1958875)
  • CookieStore, Window.cookieStore, ServiceWorkerGlobalScope.cookieStore, change event & CookieChangeEvent,
• IntersectionObserver support scrollMargin property (1860030)
• Login Status API with Federated Credential Management (FedCM) API (1945573, 1945576)
• Notification.actions (1225110)
• PerformanceEventTiming.interactionId (1934683)
• PointerEvent support persistentDeviceId property (1968400)
• PublicKeyCredential.getClientCapabilities() (1884466)
• resizeMode on getUserMedia() and getDisplayMedia() methods of MediaDevices (1286945)
• RTCCertificate support getFingerprints() method (1525241)
• RTCDataChannel support closing event and onclosing() event handler (1611953)
• URL Pattern API (1731418)
• View Transition API (1950759, 1985809)
• Web Authentication extensions: largeBlob (1795020), credProps (1844449), prf (1935280)
• WebGPU API support on Windows (1972486)
• ...

Add-ons

• cookies.SameSiteStatus support unspecified (1550032)
• json resource type in webRequest.ResourceType & declarativeNetRequest.ResourceType (1858078, 1950836)
• Manifest V3 extensions:
  • menus.ContextType support page_action (1951166)
  • userScripts API on Android - (1949955)
  • ...
• tabGroups (1940631):
  • tabs.group() & tabs.ungroup() (1959714)
  • groupId to tabs.Tab (1959713), tabs.query (1959715), tabs.onUpdated (1959716)
• webRequest.handlerBehaviorChanged (1657575)
• ...

WebDriver

• browser.createUserContext command support acceptInsecureCerts (1959372), proxy (1967653)
• browser.getClientWindows command (1855025)
• browsingContext.historyUpdated event (1906051)
• browsingContext.Info type support clientWindow property (1920952)
• browsingContext.navigationCommitted event (1945184)
• browsingContext.setViewport command support userContexts parameter (1940952)
• initiatorType & destination fields to all network events (1904892, 1933331)
• browsingContext.captureScreenshot support format field (1861737)
• cookies.SameSiteStatus support unspecified (1550032)
• emulation.setGeolocationOverride (1954992)
• emulation.setLocaleOverride (1968952)
• network.addDataCollector (1971778)
• network.removeDataCollector (1971781)
• network.getData (1971780)
• network.disownData (1971779)
• script.addPreloadScript support userContexts field (1940927)
• sessions.subscribe argument userContexts (1938604)
• webExtension.install (1934551)
• webExtension.uninstall (1934553)
• ...

Marionette:

• Addon:Install & Addon:Uninstall commands support for GeckoView (1806135)
• CHIPS cookies (Cookies Having Independent Partitioned State) support (1972830)
• ...

Protocols

• ...

HTTP

• Clear-Site-Data: cache (1942272, 1930500)
• Origin-Agent-Cluster (1665474)
• ...

Security

• Certificate Transparency supported (1938242)
• ...

Related Projects

• Interop 2025
  • Our announcement blog post: https://hacks.mozilla.org/2025/02/interop-2025/
• ...

Specifications and Notes

Edit and publish new and updated specifications and notes. See Standards for our ongoing work in this area.

• Vision for W3C published as a W3C Statement
• ...

See Also

• Platform
• Previously: Platform/Roadmap2024
• Next: Platform/Roadmap2026