Add CSS animation-range to Firefox 150 release notes (mdn#43811)

Author: pepelsbey

files/en-us/mozilla/firefox/experimental_features/index.md

@@ -133,7 +133,7 @@ You can alternatively use the {{cssxref("animation-timeline/scroll")}} functiona
 
 For more information, see [Firefox bug 1807685](https://bugzil.la/1807685), [Firefox bug 1804573](https://bugzil.la/1804573), [Firefox bug 1809005](https://bugzil.la/1809005), [Firefox bug 1676791](https://bugzil.la/1676791), [Firefox bug 1754897](https://bugzil.la/1754897), [Firefox bug 1817303](https://bugzil.la/1817303), and [Firefox bug 1737918](https://bugzil.la/1737918).
 
-The {{cssxref('timeline-scope')}}, {{cssxref('animation-range-start')}} and {{cssxref('animation-range-end')}} properties (and the {{cssxref('animation-range')}} shorthand property) are not yet supported. For more information, see [Firefox bug 1676779](https://bugzil.la/1676779).
+The {{cssxref('timeline-scope')}} property is not yet supported. For more information, see [Firefox bug 1676779](https://bugzil.la/1676779).
 
 | Release channel   | Version added | Enabled by default? |
 | ----------------- | ------------- | ------------------- |

files/en-us/mozilla/firefox/releases/150/index.md

@@ -49,6 +49,8 @@ Firefox 150 is the current [Beta version of Firefox](https://www.firefox.com/en-
 
 - The media-based pseudo-classes {{cssxref(":buffering")}}, {{cssxref(":muted")}}, {{cssxref(":paused")}}, {{cssxref(":playing")}}, {{cssxref(":seeking")}}, {{cssxref(":stalled")}}, and {{cssxref(":volume-locked")}} are now supported. They allow you to style {{htmlelement("audio")}} and {{htmlelement("video")}} elements based on their current state, such as playing or paused. ([Firefox bug 2020775](https://bugzil.la/2020775)).
 
+- The {{cssxref("animation-range-start")}} and {{cssxref("animation-range-end")}} properties (and the {{cssxref("animation-range")}} shorthand property) are now supported. These properties set the start and end of an animation's attachment range along its timeline, allowing you to control where along a [scroll-driven animation](/en-US/docs/Web/CSS/Guides/Scroll-driven_animations) timeline an animation will start and end. ([Firefox bug 1825427](https://bugzil.la/1825427)).
+
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