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Finalize release note for Firefox 147 release (mdn#42768)
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‎files/en-us/mozilla/firefox/releases/146/index.md‎

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---
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title: Firefox 146 release notes for developers (Stable)
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short-title: Firefox 146 (Stable)
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title: Firefox 146 release notes for developers
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short-title: Firefox 146
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slug: Mozilla/Firefox/Releases/146
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page-type: firefox-release-notes-active
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page-type: firefox-release-notes
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sidebar: firefox
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---
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‎files/en-us/mozilla/firefox/releases/147/index.md‎

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---
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title: Firefox 147 release notes for developers (Beta)
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short-title: Firefox 147 (Beta)
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title: Firefox 147 release notes for developers (Stable)
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short-title: Firefox 147 (Stable)
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slug: Mozilla/Firefox/Releases/147
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page-type: firefox-release-notes-active
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sidebar: firefox
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---
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This article provides information about the changes in Firefox 147 that affect developers.
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Firefox 147 is the current [Beta version of Firefox](https://www.firefox.com/en-US/channel/desktop/#beta) and ships on [January 13, 2026](https://whattrainisitnow.com/release/?version=147).
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> [!NOTE]
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> The release notes for this Firefox version are still a work in progress.
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<!-- Authors: Please uncomment any headings you are writing notes for -->
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Firefox 147 was released on [January 13, 2026](https://whattrainisitnow.com/release/?version=147).
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## Changes for web developers
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- A highlighted element's associated {{cssxref("@position-try")}} rules are now displayed in the CSS rules panel. ([Firefox bug 1895176](https://bugzil.la/1895176)).
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- JSON payloads can be imported into Firefox Profiler from the JSON viewer using a new button. This provides a breakdown of the size of the resource. ([Firefox bug 1997209](https://bugzil.la/1997209)).
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### HTML
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No notable changes.
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### SVG
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- When an SVG file is used as an [image source](/en-US/docs/Web/SVG/Guides/SVG_as_an_image) (for example, embedded into a page via an {{htmlelement("img")}} element or as a CSS {{cssxref("background-image")}}), the SVG URL now supports [media fragments](/en-US/docs/Web/URI/Reference/Fragment/Media_fragments). ([Firefox bug 1999989](https://bugzil.la/1999989)). This means that:
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- When the SVG includes a [SMIL animation](/en-US/docs/Web/SVG/Guides/SVG_animation_with_SMIL), you can use [temporal dimension](/en-US/docs/Web/URI/Reference/Fragment/Media_fragments#temporal_dimension_fragment_syntax) syntax to play a portion of the animation from a specific start time to a specific end time, after which the animation will pause.
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- You can use [spatial dimension](/en-US/docs/Web/URI/Reference/Fragment/Media_fragments#spatial_dimension_fragment_syntax) syntax to display a specific area of the SVG document.
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<!-- #### Removals -->
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### CSS
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- [CSS anchor positioning](/en-US/docs/Web/CSS/Guides/Anchor_positioning) is now enabled by default.
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- The following [relative length units based on root element's font](/en-US/docs/Web/CSS/Reference/Values/length#relative_length_units_based_on_root_elements_font) are now supported: `rcap`, `rch`, `rex`, and `ric`. These units allow you to define `<length>` values based on the size of a particular character or font attribute of the [root](/en-US/docs/Web/CSS/Reference/Selectors/:root) element.
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([Firefox bug 1740584](https://bugzil.la/1740584)).
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### JavaScript
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- CSS module scripts are now supported, allowing a stylesheet to be loaded into a script as a {{domxref("CSSStyleSheet")}} instance using the [`import`](/en-US/docs/Web/JavaScript/Reference/Statements/import) keyword and the [`type` import attribute](/en-US/docs/Web/JavaScript/Reference/Statements/import/with) set to `type="css"`.
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([Firefox bug 1986681](https://bugzil.la/1986681)).
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- The {{jsxref("Iterator.concat()")}} method is now supported. This method enables you to create a new iterator that combines multiple input iterables into a single sequence.
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([Firefox bug 1986672](https://bugzil.la/1986672)).
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### APIs
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- The {{domxref("Document.activeViewTransition")}} property is now supported, which returns a {{domxref("ViewTransition")}} instance representing the [view transition](/en-US/docs/Web/API/View_Transition_API) currently active on the document. This provides a consistent way to access an active view transition in any context without having to manually store a reference to it for later use. ([Firefox bug 2001836](https://bugzil.la/2001836)).
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To load a service worker module, specify a [`type`](/en-US/docs/Web/API/ServiceWorkerContainer/register#type) of `'module'` when calling {{domxref("ServiceWorkerContainer.register()")}}.
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([Firefox bug 1360870](https://bugzil.la/1360870)).
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### WebDriver conformance (WebDriver BiDi, Marionette)
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#### General
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- Temporarily loaded Manifest Version 3 extensions can now load scripts from localhost, as explained in [Scripts from localhost](/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_Security_Policy#scripts_from_localhost) in the Content Security Policy article. ([Firefox bug 1864284](https://bugzil.la/1864284))
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## Experimental web features
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These features are shipping in Firefox 147 but are disabled by default.

‎files/en-us/mozilla/firefox/releases/148/index.md‎

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title: Firefox 148 release notes for developers (Nightly)
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short-title: Firefox 148 (Nightly)
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title: Firefox 148 release notes for developers (Beta)
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short-title: Firefox 148 (Beta)
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slug: Mozilla/Firefox/Releases/148
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page-type: firefox-release-notes-active
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This article provides information about the changes in Firefox 148 that affect developers.
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Firefox 148 is the current [Nightly version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [February 24, 2026](https://whattrainisitnow.com/release/?version=148).
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Firefox 148 is the current [Beta version of Firefox](https://www.firefox.com/en-US/channel/desktop/#beta) and ships on [February 24, 2026](https://whattrainisitnow.com/release/?version=148).
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> [!NOTE]
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> The release notes for this Firefox version are still a work in progress.

‎files/en-us/mozilla/firefox/releases/149/index.md‎

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---
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title: Firefox 149 release notes for developers (Nightly)
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short-title: Firefox 149 (Nightly)
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slug: Mozilla/Firefox/Releases/149
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page-type: firefox-release-notes-active
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sidebar: firefox
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---
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This article provides information about the changes in Firefox 149 that affect developers.
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Firefox 149 is the current [Nightly version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [March 24, 2026](https://whattrainisitnow.com/release/?version=149).
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> [!NOTE]
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> The release notes for this Firefox version are still a work in progress.
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<!-- Authors: Please uncomment any headings you are writing notes for -->
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## Changes for web developers
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<!-- ### Developer Tools -->
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<!-- No notable changes. -->
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<!-- ### WebAssembly -->
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<!-- ### WebDriver conformance (WebDriver BiDi, Marionette) -->
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<!-- #### General -->
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## Changes for add-on developers
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<!-- ### Other -->
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## Experimental web features
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These features are shipping in Firefox 149 but are disabled by default.
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To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`.
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You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page.

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