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@@ -11,10 +11,22 @@ Firefox 146 was released on [December 9, 2025](https://whattrainisitnow.com/rele
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## Changes for web developers
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### Developer Tools
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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.
- 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.
- 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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- {{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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### MathML
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- Operator mirroring in right-to-left (RTL) modes and stretching now work properly when used in combination.
- 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.
- Fixed a bug in the `WebFrame` JSON deserialization that incorrectly raised a `no such window` error instead of `no such frame` when handling invalid frames. ([Firefox bug 1996540](https://bugzil.la/1996540)).
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- Added a WebDriver extension to control the [Global Privacy Control](https://w3c.github.io/gpc/) signal. ([Firefox bug 1969865](https://bugzil.la/1969865)).
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### Developer Tools
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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.
- {{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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