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docs(firefox-release): Finalize release note for FF146 release (mdn#42319)
* update dates and add page for nightly * reorder devtools and mathml sections * Revert "reorder devtools and mathml sections" This reverts commit fc430ad.
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‎files/en-us/mozilla/firefox/releases/145/index.md‎

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---
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title: Firefox 145 release notes for developers (Stable)
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short-title: Firefox 145 (Stable)
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title: Firefox 145 release notes for developers
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short-title: Firefox 145
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slug: Mozilla/Firefox/Releases/145
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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/146/index.md‎

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title: Firefox 146 release notes for developers (Beta)
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short-title: Firefox 146 (Beta)
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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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slug: Mozilla/Firefox/Releases/146
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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 146 that affect developers.
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Firefox 146 is the current [Beta version of Firefox](https://www.firefox.com/en-US/channel/desktop/#beta) and ships on [December 9, 2025](https://whattrainisitnow.com/release/?version=146).
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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 146 was released on [December 9, 2025](https://whattrainisitnow.com/release/?version=146).
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## Changes for web developers
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- In the Rule view of the Inspector, when a displayed ruleset declares 10 or more [CSS custom properties](/en-US/docs/Web/CSS/Reference/Properties/--*) that are unused, those properties are hidden by default. This reduces clutter, and in some cases also speeds up the rendering of the Inspector panel. In such cases, the hidden properties can be displayed via a "Show..." button provided at the bottom of the ruleset.
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([Firefox bug 1719461](https://bugzil.la/1719461)).
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<!-- ### HTML -->
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<!-- No notable changes. -->
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### HTML
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<!-- #### Removals -->
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No notable changes.
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### MathML
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- The {{cssxref("math-shift")}} property is now supported. This allows developers to indicate whether superscript rendering in MathML formulas should be normal or compact, affecting the height to which superscript text is shifted.
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([Firefox bug 1994171](https://bugzil.la/1994171)).
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<!-- #### Removals -->
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<!-- ### SVG -->
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<!-- #### Removals -->
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### CSS
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- The {{cssxref("color_value/contrast-color()")}} function is now supported. This function takes a [`<color>`](/en-US/docs/Web/CSS/Reference/Values/color_value) value and returns a contrasting color that ensures at least [WCAG AA minimum contrast](https://w3c.github.io/wcag/guidelines/22/#contrast-minimum).
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This keyword is an alias for the recently-standardized `stretch` keyword (i.e., [`width: stretch`](/en-US/docs/Web/CSS/Reference/Properties/width#stretch) and [`height: stretch`](/en-US/docs/Web/CSS/Reference/Properties/height#stretch)), which isn't yet supported in Firefox.
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([Firefox bug 1988938](https://bugzil.la/1988938), [Firefox bug 1789477](https://bugzil.la/1789477)).
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<!-- #### Removals -->
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### JavaScript
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- {{jsxref("WeakMap")}} and {{jsxref("WeakSet")}} now accept {{jsxref("Symbol")}} objects as keys, except for those that are [registered](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol#shared_symbols_in_the_global_symbol_registry). ([Firefox bug 1966745](https://bugzil.la/1966745)).
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<!-- ### HTTP -->
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<!-- ### Security -->
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### APIs
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- {{domxref("SubtleCrypto.importKey()")}} now allows you to import keys defined as compressed elliptic curve points when using the [ECDSA](/en-US/docs/Web/API/SubtleCrypto/sign#ecdsa) or [ECDH](/en-US/docs/Web/API/SubtleCrypto/deriveKey#ecdh) algorithms. ([Firefox bug 1971499](https://bugzil.la/1971499)).
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### WebDriver conformance (WebDriver BiDi, Marionette)
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#### WebDriver BiDi
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- {{WebExtAPIRef("browsingData.removeLocalStorage")}} and {{WebExtAPIRef("browsingData.remove")}} (when `localStorage` is set in {{WebExtAPIRef("browsingData.DataTypeSet")}}) now delete objects from [`sessionStorage`](/en-US/docs/Web/API/Window/sessionStorage). ([Firefox bug 1886894](https://bugzil.la/1886894))
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## Experimental web features
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These features are shipping in Firefox 146 but are disabled by default.

‎files/en-us/mozilla/firefox/releases/147/index.md‎

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title: Firefox 147 release notes for developers (Nightly)
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short-title: Firefox 147 (Nightly)
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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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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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This article provides information about the changes in Firefox 147 that affect developers.
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Firefox 147 is the current [Nightly version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [January 13, 2026](https://whattrainisitnow.com/release/?version=147).
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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.

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

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---
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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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slug: Mozilla/Firefox/Releases/148
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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 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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> [!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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<!-- ### HTML -->
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<!-- No notable changes. -->
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<!-- #### Removals -->
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<!-- ### MathML -->
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<!-- #### Removals -->
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<!-- ### SVG -->
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<!-- #### Removals -->
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<!-- ### CSS -->
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<!-- No notable changes. -->
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<!-- ### HTTP -->
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<!-- ### Security -->
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<!-- ### APIs -->
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<!-- #### DOM -->
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<!-- #### Media, WebRTC, and Web Audio -->
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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 148 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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