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Updates for Firefox 146 beta#28576

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caugner merged 1 commit intomdn:mainfrom
Elchi3:firefox-146-beta
Dec 4, 2025
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Updates for Firefox 146 beta#28576
caugner merged 1 commit intomdn:mainfrom
Elchi3:firefox-146-beta

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@Elchi3 Elchi3 commented Dec 4, 2025

The https://collector.openwebdocs.org/ project (v10.16.1) found new features shipping in Firefox 146 beta which was released a couple of weeks ago. Currently, the collector covers about 90% of BCD, so the following list might not be exhaustive. Also, if a feature is in Firefox Nightly only, it is not considered here.

With this PR, BCD considers the following 26 features as shipping in Firefox 145:

  • api.CSSScopeRule
  • api.CSSScopeRule.end
  • api.CSSScopeRule.start
  • css.properties.math-shift.compact
  • css.properties.math-shift.normal
  • javascript.builtins.FinalizationRegistry.register.symbol_as_target
  • javascript.builtins.WeakRef.WeakRef.symbol_as_target
  • javascript.builtins.WeakSet.symbol_as_keys
  • webassembly.relaxed-SIMD

Updated in other PRs:

  • api.CSSCustomMediaRule
  • css.at-rules.custom-media
  • css.at-rules.scope
  • css.properties.height.stretch (as -webkit-fill-available)
  • css.properties.math-shift
  • css.properties.text-decoration-inset
  • css.properties.text-decoration-inset.auto
  • css.properties.width.stretch (as -webkit-fill-available)
  • css.types.color.contrast-color
  • javascript.builtins.WeakMap.symbol_as_keys
  • webdriver.bidi.emulation.setLocaleOverride.locale_parameter.sets_navigator_language
  • webdriver.bidi.network.getData.data_url
  • webdriver.bidi.network.getData.dataType_parameter.request
  • webdriver.bidi.network.setExtraHeaders
  • webdriver.bidi.network.setExtraHeaders.contexts_parameter
  • webdriver.bidi.network.setExtraHeaders.headers_parameter
  • webdriver.bidi.network.setExtraHeaders.userContexts_parameter

See also mdn/mdn#763 and https://www.mozilla.org/en-US/firefox/146.0beta/releasenotes/

@github-actions github-actions bot added data:api Compat data for Web APIs. https://developer.mozilla.org/docs/Web/API data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS data:js Compat data for JS/ECMAScript features. https://developer.mozilla.org/docs/Web/JavaScript data:wasm Compat data for Web Assembly features. https://developer.mozilla.org/en-US/docs/WebAssembly size:m [PR only] 25-100 LoC changed labels Dec 4, 2025
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github-actions bot commented Dec 4, 2025

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

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LGTM.

Feature Ref
api.CSSScopeRule https://bugzilla.mozilla.org/show_bug.cgi?id=1991105
api.CSSScopeRule.end https://bugzilla.mozilla.org/show_bug.cgi?id=1991105
api.CSSScopeRule.start https://bugzilla.mozilla.org/show_bug.cgi?id=1991105
css.properties.math-shift.compact https://bugzilla.mozilla.org/show_bug.cgi?id=1994171
css.properties.math-shift.normal https://bugzilla.mozilla.org/show_bug.cgi?id=1994171
javascript.builtins.FinalizationRegistry.register.symbol_as_target https://bugzilla.mozilla.org/show_bug.cgi?id=1966745
javascript.builtins.WeakRef.WeakRef.symbol_as_target https://bugzilla.mozilla.org/show_bug.cgi?id=1966745
javascript.builtins.WeakSet.symbol_as_keys https://bugzilla.mozilla.org/show_bug.cgi?id=1966745
webassembly.relaxed-SIMD https://bugzilla.mozilla.org/show_bug.cgi?id=1930192

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caugner commented Dec 4, 2025

webassembly.relaxed-SIMD

According to https://bugzilla.mozilla.org/show_bug.cgi?id=1930192, this might have landed in Firefox 145 already.

Edit: https://mdn-bcd-collector.gooborg.com/tests/webassembly/relaxed-SIMD does not pass in Firefox 145.0.2, so Firefox 146 appears to be correct.

@caugner caugner merged commit 0878408 into mdn:main Dec 4, 2025
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@Elchi3 Elchi3 deleted the firefox-146-beta branch December 4, 2025 16:56
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data:api Compat data for Web APIs. https://developer.mozilla.org/docs/Web/API data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS data:js Compat data for JS/ECMAScript features. https://developer.mozilla.org/docs/Web/JavaScript data:wasm Compat data for Web Assembly features. https://developer.mozilla.org/en-US/docs/WebAssembly size:m [PR only] 25-100 LoC changed

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