As of Firefox 154, I intend to turn the sibling-index() 
<https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/sibling-index>
 
and sibling-count() 
<https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/sibling-count>
 
CSS functions on by default on all platforms. These have been developed 
behind the *layout.css.tree-counting-functions.enabled* preference. These 
features have been shipped in other browsers since Chrome 138 and Safari 
26.2.

*Bugs*:
- Bug 1953973 - [css-values] Add sibling-count() and sibling-index() 
<https://bugzilla.mozilla.org/show_bug.cgi?id=1953973> - Main bug.
- Bug 2045706 -  Set layout.css.tree-counting-functions.enabled for all 
users <https://bugzilla.mozilla.org/show_bug.cgi?id=2045706> - Bug to 
launch feature.

*Standard*:
https://drafts.csswg.org/css-values-5/#tree-counting

*Intent to Prototype Thread*:
https://groups.google.com/a/mozilla.org/g/dev-platform/c/6Pmh63BB1bc


*Changes Since Intent to Prototype:*Two DevTool bugs were filed by Nicolas 
related to colors that use sibling-index()/sibling-count(): Bug 2047874 
<https://bugzilla.mozilla.org/show_bug.cgi?id=2047874> and Bug 2047871 
<https://bugzilla.mozilla.org/show_bug.cgi?id=2047871>.

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