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    Experimental features in Firefox

    In order to test new features, Mozilla publishes a test version of the Firefox browser, Firefox Nightly, every day. Experimental features, for example implementations of proposed Web platform standards, are available. This page lists features that are in Nightly versions of Firefox along with information on how to activate them, if necessary. You can test your Web sites and applications before these features get released and ensure everything will still work with the latest Web technology capabilities.

    To test these experimental features, you need to download Firefox Nightly or Firefox Developer Edition.

    CSS

    Feature Firefox Nightly Firefox Developer Edition Firefox Beta Firefox Release Preference
    Grid Layout 40 40 Disabled Disabled layout.css.grid.enabled
    Subgrids Disabled Disabled Disabled Disabled layout.css.grid-template-subgrid-value.enabled
    Logical values for clear and float CSS properties
    The values clear: inline-start and clear: inline-end as well as float: inline-start and float: inline-end are making easier to create layouts that are agnostic to the text directionality.    		 45 45 Disabled Disabled layout.css.float-logical-values.enabled
    Display stray control characters in CSS as hex boxes
    This feature renders control characters (Unicode category Cc) other than tab (U+0009), line feed (U+000A), form feed (U+000C), and carriage return (U+000D) as a hexbox when they are not expected.    		 43 43 Disabled Disabled layout.css.control-characters.enabled
    The transform-box property
    Controls the box the relative values of transform-origin and transform relate too.    		 41 41 Disabled Disabled svg.transform-box.enabled
    Basic shapes in clip-path
    Adds the functions circle(), ellipse(), and polygon() to the set of possible values for clip-path.    		 Disabled
    (available since 47)    		 Disabled
    (available since 47)    		 Disabled
    (available since 47)    		 Disabled
    (available since 47)    		 layout.css.clip-path-shapes.enabled
    The font-display descriptor for @font-face
    To improve Web fonts performance, @font-face has an experimental font-display descriptor.    		 Disabled
    (available since 46)    		 Disabled
    (available since 46)    		 Disabled
    (available since 46)    		 Disabled
    (available since 46)    		 layout.css.font-display.enabled
    Longhand properties of CSS Masks
    The longhand properties of CSS Masks are only available behind a compile flag (MOZ_ENABLE_MASK_AS_SHORTHAND).    		 --- --- --- --- ---
    The touch-action CSS property
    The touch-action CSS property is part of the Pointer Events specification, and lets the CSS specify how and in what way the user is able to manipulate an object by touch.    		 50 --- --- --- layout.css.touch_action.enabled

    JavaScript

    See also ECMAScript Next support for implemented features of ECMAScript 2016 and later, that are not experimental and thus available without preferences in Firefox Release.

    Feature Firefox Nightly Firefox Developer Edition Firefox Beta Firefox Release Preference
    Exponentiation operator 42 Disabled, see bug 1243858 Disabled, see bug 1243858 Disabled, see bug 1243858 None
    Additions to the ArrayBuffer object
    Adds the ArrayBuffer.transfer() that returns a new ArrayBuffer whose contents have been taken from the oldBuffer's data (spec).    		 36 Disabled Disabled Disabled None
    TypedObject objects (spec) Enabled Disabled Disabled Disabled None
    SIMD (specification and polyfill) Enabled Disabled Disabled Disabled None
    Shared Memory objects
    SharedArrayBuffer
    Atomics    		 Enabled
    (available since 46)    		 Disabled
    (available since 46)    		 Disabled
    (available since 46)    		 Disabled
    (available since 46)    		 javascript.options.shared_memory

    APIs

    Canvas & WebGL

    Feature Firefox Nightly Firefox Developer Edition Firefox Beta Firefox Release Preference
    WebGL 2
    The WebGL2RenderingContext interface provides the OpenGL ES 3.0 rendering context for the drawing surface of an HTML <canvas> element.    		 46
    (implemented with disabled pref before 46)    		 Disabled Disabled Disabled webgl.enable-webgl2
    WEBGL_debug_renderer_info extension
    The WEBGL_debug_renderer_info extension allows to transmit information useful to help debugging problems to the server.    		 42 42 Disabled Disabled webgl.enable-debug-renderer-info
    OffscreenCanvas
    The OffscreenCanvas interface provides a canvas that can be rendered off screen. It is available in both the window and worker contexts.    		 Disabled
    (available since 44)    		 Disabled
    (available since 44)    		 Disabled
    (available since 44)    		 Disabled
    (available since 44)    		 gfx.offscreencanvas.enabled
    Hit regions
    Whether the mouse coordinates are within a particular area on the canvas, is a common problem to solve. The hit region API allows you define an area of your canvas and provides another possibility to expose interactive content on a canvas to accessibility tools.    		 Disabled
    (available since 30)    		 Disabled
    (available since 30)    		 Disabled
    (available since 30)    		 Disabled
    (available since 30)    		 canvas.hitregions.enabled

     DOM

    Feature Firefox Nightly Firefox Developer Edition Firefox Beta Firefox Release Preference
    WebVR API
    The WebVR API allows to control and use virtual reality devices.    		 46
    A major update of the interface happened in version 51.    		 46
    A major update of the interface happened in version 51.    		 Disabled Disabled dom.vr.enabled
    FlyWeb
    FlyWeb is a project at Mozilla focused on bringing a new set of APIs to the browser for advertising and discovering local-area web servers.    		 51 Disabled Disabled Disabled dom.flyweb.enabled
    HTMLMediaElement.seekToNextFrame()
    Part of an experimentation process around support non-real-time access to media for tasks including filtering, editing, and so forth, the HTMLMediaElement.seekToNextFrame() advances the the current play position to the next frame in the media.    		 49
    (Fundamental update in version 50)    		 49
    (Fundamental update in version 50)    		 Disabled Disabled media.seekToNextFrame.enabled
    GeometryUtils.getBoxQuads() (bug 917755) 31 31 Disabled Disabled layout.css.getBoxQuads.enabled
    GeometryU tils.convertPointFromNode(),
    GeometryUtils.RectFromNode(), and
    GeometryUtils.convertQuadFromNode()
    (bug 918189)    		 31 31 Disabled Disabled layout.css.convertFromNode.enabled
    Node.rootNode
    The Node.rootNode property returns a Node object representing the topmost node in the tree, or the current node if it's the topmost node in the tree.
    This feature is kept experimental as its naming poses Web compatibility problems. It will be renamed in the future.    		 48 48 Disabled Disabled dom.node.rootNode.enabled
    Performance Observer API
    The PerformanceObserver interface is used to observe performance measurement events and be notified of new performance entries as they are recorded in the browser's performance timeline.    		 49 Disabled Disabled Disabled dom.enable_performance_observer
    WebVTT Regions API
    WebVTT regions are parts of the video viewport that provide a rendering area for WebVTT cues. The VTTRegion is the interface exposing the WebVTT cues.
    This interface is considered to be in flux and isn't therefore activated in any version by default.    		 Disabled
    (Experimental implementation since version 30)    		 Disabled Disabled Disabled media.webvtt.regions.enabled
    Support for audio and video tracks
    Implements HTMLMediaElement.audioTracks and HTMLMediaElment.videoTracks.
    Firefox doesn't support multiple audio or video tracks, preventing the most common use cases for these properties to work properly. That's why these properties are not activated by default in any version.    		 Disabled
    (Experimental implementation since version 33)    		 Disabled Disabled Disabled media.track.enabled
    Better value for Event.timestamp
    The property Event.timestamp is returning a DOMHighResTimeStamp, but the value is not the time since but since the reboot. This change allow for returning a timestamp relative to the Unix epoch.    		 32 (Windows)
    43 (Linux)    		 32 (Windows)
    43 (Linux)    		 Disabled Disabled media.track.enabled
    Pointer Events 50 Disabled Disabled Disabled dom.w3c_pointer_events.enabled
    MediaDevices.ondevicechange and the devicechange event
    The MediaDevices.ondevicechange event handler and corresponding devicechange event make it possible to detect and react when audio and video devices are attached to or removed from the computer.

    Disabled
    51 (Mac)

    Enabled
    52 (Mac)
    52 (Windows)
    52 (Linux)

    Disabled
    51 (Mac)

    Enabled
    52 (Mac)
    52 (Windows)
    52 (Linux)

    Disabled
    51 (Mac)

    Enabled
    52 (Mac)
    52 (Windows)
    52 (Linux)

    Disabled
    51 (Mac)

    Enabled
    52 (Mac)
    52 (Windows)
    52 (Linux)

    		 media.ondevicechange.enabled

    Developer Tools

    Feature Firefox Nightly Firefox Developer Edition Firefox Beta Firefox Release Preference
    Debugger rewrite in HTML 52 Disabled Disabled Disabled devtools.debugger.new-debugger-frontend
    Console rewrite in HTML 52 Disabled Disabled Disabled devtools.webconsole.new-frontend-enabled
    Responsive Design Mode rewrite in HTML
    A rewrite of Responsive Design Mode using HTML adds new features like a device selector (applies size, UA, dPR), UI redesign, and there's more still to come.    		 52 Disabled Disabled Disabled devtools.responsive.html.enabled
    Experimental Performance tool options
    Enables options in the UI for JIT optimizations, memory, etc.    		 41 Disabled Disabled Disabled devtools.performance.ui.experimental

    See also

    Document Tags and Contributors

    Tags: 
     Contributors to this page: Sheppy, teoli, gomezmichael7574, birtles, jryans, justindarc, msreckovic, fscholz
     Last updated by: Sheppy,