Features that shipped in stable Firefox are included

[o-t-w]

MDN URL

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

This page lists many features that have shipped in the stable version of Firefox, which makes it confusing. COLRv1 fonts is one example. backdrop-filter is another.

What did you expect to see?

This page should only list experimental features.

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

No response

MDN metadata

Page report details

• Folder: en-us/mozilla/firefox/experimental_features
• MDN URL: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features
• GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/mozilla/firefox/experimental_features/index.md
• Last commit: 1f8e008
• Document last modified: 2024-10-29T11:21:35.000Z

[hamishwillee]

Thanks @o-t-w

@Rumyra @bsmth This is a valid point. I grepped on the preferences and then searched on their values in the source - quite a lot of things are out of date. I'm adding this to a release project so we can start tidying it up. It isn't as simple as fixing this doc - there might be errors in the compatibility data too.

For the list below:

• FALSE - data is correct in doc (feature still experimental)
• TRUE - data is incorrect in doc as this is released. Check BCD. Remove.
• NOTPRESENT - pref not present, so is probably true. But might not be. Check BCD and work out from there.
• NIGHTLY - data should be in expr features, but lets check bcd and that it says nightly

The list

To be checked

• NOTPRESENT layout.css.aspect-ratio-number.enabled trying to find out in https://bugzilla.mozilla.org/show_bug.cgi?id=1621090#c1

To be fixed:

?

Fixed:

• TRUE apz.allow_zooming and (on Windows) TRUE apz.windows.use_direct_manipulation
  • Not experimental. Removed FF ExprFeat: Remove desktop zooming and mobile gesture support in RDM #36860
• Dev&Nightly - layout.css.letter-spacing.model - fixed by Experimental features: Fixes for cssletterspacing #37056
• CHECK media.setsinkid.enabled - delete section - fixed by Experimental features: Fixes for cssletterspacing #37056
• NIGHTLY IS TRUE security.insecure_connection_text.enabled for normal browsing mode; security.insecure_connection_text.pbmode.enabled for private browsing mode - fixed by Experimental features: Fixes for cssletterspacing #37056 (nightly in 121)
• TRUE layout.css.relative-color-syntax.enabled - FF128 https://bugzilla.mozilla.org/show_bug.cgi?id=1900251 - renotes etc were in [CSS] Enable relative color syntax on stable. #33985. - fixed by Experimental features: Fixes for cssletterspacing #37056 (Deleted section Epr.Feat )
• TRUE layout.css.font-tech.enabled - FF107 https://bugzilla.mozilla.org/show_bug.cgi?id=1900251 - fixed by Experimental features: Fixes for cssletterspacing #37056 (removed section)
• TRUE layout.css.backdrop-filter.enabled - FF103 https://bugzilla.mozilla.org/show_bug.cgi?id=1578503 - fixed by Experimental features: Fixes for cssletterspacing #37056
• TRUE layout.css.page-orientation.enabled - FF122 https://bugzilla.mozilla.org/show_bug.cgi?id=1869880
  • BCD fix Firefox 122 supports page-orientation descriptor for the @page at-rule browser-compat-data#25299
  • Fixed in Experimental features: Fixes for cssletterspacing #37056
• TRUE layout.css.zoom.enabled - FF126 https://bugzilla.mozilla.org/show_bug.cgi?id=390936
  • Docs and BCD for this in FF126 zoom enabled (remove) added release note for css zoom in ff126 #33512
  • Fixed in Experimental features: Fixes for cssletterspacing #37056
• TRUE - layout.css.text-wrap-balance.enabled - FF121 https://bugzilla.mozilla.org/show_bug.cgi?id=1860446
  • 10: layout.css.text-wrap-balance.limit - setting value of 10 in https://bugzilla.mozilla.org/show_bug.cgi?id=1731541
  • True: layout.css.text-wrap-balance-after-clamp.enabled - setting https://bugzilla.mozilla.org/show_bug.cgi?id=1731541
  • Fixed by removing section in Experimental features: Fixes for cssletterspacing #37056
• FALSE layout.css.prefixes.transitions
  • BCD fixes in Firefox 126 removed / Nightly unremoved some moz-prefixed CSS properties browser-compat-data#25300
  • Note, this was "False to enable", so opposite of normal.
  • Fixed by removing section in Experimental features: Fixes for cssletterspacing #37056
• TRUE layout.css.prefixes.transforms - FF133 https://bugzilla.mozilla.org/show_bug.cgi?id=1886134
  • BCD fixes Firefox 126 removed / Nightly unremoved some moz-prefixed CSS properties browser-compat-data#25300
  • Note, also opposite of normal - "FALSE" means working.
  • Fixed by updating section to note that this is no longer enabled in nightly Experimental features: Fixes for cssletterspacing #37056
• TRUE devtools.webconsole.input.context - FF97 https://bugzilla.mozilla.org/show_bug.cgi?id=1731740
  • Fixed by removal in Experimental features - fixes following review #37142
• TRUE dom.serviceWorkers.navigationPreload.enabled - FF99 https://bugzilla.mozilla.org/show_bug.cgi?id=1754786
• TRUE gfx.font_rendering.colr_v1.enabled - FF107 https://bugzilla.mozilla.org/show_bug.cgi?id=1791558
  • Fixed by removal in Experimental features - fixes following review #37142 - BCD already correct. Too early to bother with relnote update
• TRUE layout.css.starting-style-at-rules.enabled - FF129 https://bugzilla.mozilla.org/show_bug.cgi?id=1900458
  • Fixed by removal in Experimental features - fixes following review #37142 - BCD and relnote already up to date ala DaveL
• TRUE permissions.media.query.enabled - FF132 https://bugzilla.mozilla.org/show_bug.cgi?id=1916993
  • Removed from expr features in Experimental features - fixes following review #37142
  • BCD FF132 permissions API - camera, microphone browser-compat-data#25349
  • Relnote FF132 Relnote: camera and microphone permissions #37144
• NOTPRESENT devtools.inspector.ruleview.inline-compatibility-warning.enabled
  • Removed from expr features in Experimental features - fixes following review #37142
  • No BCD or relnote required.
  • Note, can't find release but can see it is there. Usually the not present thing means "added a very long time ago"
• NOTPRESENT devtools.netmonitor.features.serverSentEvents
  • Fixed in FF82 https://bugzilla.mozilla.org/show_bug.cgi?id=1640857
  • Removed from expr features in Experimental features - fixes following review #37142
• NOTPRESENT privacy.clearsitedata.cache.enabled
  • Data removed in 94, and actual thingy removed much earlier. Looks like I did the other docs - but link to experimental features I provided was BCD, so am confused.
  • Removed from expr features in Experimental features - fixes following review #37142
• NOTPRESENT So layout.css.control-characters.visible is still in prefs, but layout.css.control-characters.enabled removed. Feature still on radar for being dealt with - see https://bugzilla.mozilla.org/show_bug.cgi?id=1790223#c4
  • Remove the removed preference and perhaps add link to this new bug: Experimental features fixes  #37156 (review)
• NOTPRESENT dom.svg.pathSeg.enabled - FF129 removed path and preference https://bugzilla.mozilla.org/show_bug.cgi?id=1745149
  • Removed BCD entry FF97 removes SVGPathElement.getPathSegAtLength() browser-compat-data#25362 (note, only one API in compat data)
  • Removed expr features section in Experimental features fixes  #37156
• NOTPRESENT canvas.hitregions.enabled
  • Evidence it once existed in https://bugzilla.mozilla.org/show_bug.cgi?id=966591 but the accompanying method is not implemented and is still in an open spec.
  • Removed from expr. features in Experimental features fixes  #37156

OK (Checked):

• NIGHTLY dom.screenorientation.allow-lock
• NIGHTLY layout.css.basic-shape-shape.enabled
• NIGHTLY layout.css.font-variant-emoji.enabled
• NIGHTLY dom.cookieStore.enabled
• NIGHTLY dom.webgpu.enabled
• NIGHTLY dom.customHighlightAPI.enabled
• NIGHTLY dom.shadowdom.selection_across_boundary.enabled
• NIGHTLY/EARLY RELESE layout.css.convertFromNode.enable
• NIGHTLY layout.css.getBoxQuads.enabled
• DEVELOPER (conditional on not-nightly) layout.css.h1-in-section-ua-styles.enabled
• CHECK 1: Normal. image.avif.compliance_strictness
• Check - True XP_WIN, Nighty otherwise - NIGHTLY/XPWIN: dom.webnotifications.requireinteraction.enabled
• CHECK dom.origin-trials.private-attribution.state - I think correct - set to 1 to enabled always (not set by any conditions)
• TRUE network.cors_preflight.authorization_covered_by_wildcard - FF115 https://bugzilla.mozilla.org/show_bug.cgi?id=1687364
  • This is correct - it will eventually be set to false by https://bugzilla.mozilla.org/show_bug.cgi?id=1841019 all the time.

Those known to be good (FALSE)

• FALSE layout.forms.input-type-search.enabled
• FALSE layout.forms.reveal-password-button.enabled
• FALSE layout.css.initial-let
• FALSE layout.forms.input-type-search.enabled
• FALSE layout.forms.reveal-password-button.enabled
• FALSE layout.css.initial-letter.enabled
• FALSE layout.css.fit-content-function.enabled
• FALSE layout.css.scroll-driven-animations.enabled
• FALSE layout.css.at-scope.enabled
• FALSE layout.css.prefers-reduced-transparency.enabled
• FALSE layout.css.inverted-colors.enabled
• FALSE layout.css.scroll-driven-animations.enabled
• FALSE layout.css.anchor-positioning.enabled
• FALSE javascript.options.experimental.promise_try
• FALSE javascript.options.experimental.json_parse_with_source
• FALSE dom.fetchKeepalive.enabled - Nightly!
• FALSE dom.closewatcher.enabled - Developer edn
• FALSE dom.reporting.enabled
• FALSE media.mediasource.experimental.enabled
• FALSE dom.vr.enabled
• FALSE media.track.enabled
• FALSE dom.payments.request.enabled and
• FALSE (Early beta windows, otherwise false) dom.webshare.enabled
• FALSE security.mixed_content.block_object_subrequest
• FALSE dom.security.featurePolicy.header.enabled
• FALSE image.jxl.enabled
• FALSE network.cookie.sameSite.laxByDefault

[Rumyra]

Thanks so much for this @hamishwillee !

[bsmth]

Thanks, all. I had a look for anything in your NOTPRESENT column, and can't find much information in source / bugzilla, so I think most of these have been removed or supported a long time ago. The layout.css.control-characters.visible preference, I believe is the correct variant.

Exception looks like SSE, I don't see the pref at all, but there's a bug here tracking it: https://bugzilla.mozilla.org/show_bug.cgi?id=1405706

edit: For checking prefs, I was having a look at:

• StaticPrefList.yaml as usual, and the following two which are new to me:
• all.js
• firefox.js