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Verify and update Firefox feature flag data #30012

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Verify and update Firefox feature flag data #30012

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5f290ad
Service-Worker-Navigation-Preload is supported by default in Firefox 99
caugner Jul 8, 2026
55febca
startViewTransition update callback is supported by default in Firefo…
caugner Jul 8, 2026
4952413
Notification.requireInteraction ships on Windows and Linux
caugner Jul 8, 2026
64df6dd
Web Share API is Nightly-only in Firefox
caugner Jul 8, 2026
2846837
CSS advanced attr() is Nightly-only in Firefox
caugner Jul 8, 2026
67df79f
Scroll-driven animation range features are Nightly-only in Firefox
caugner Jul 8, 2026
99b6eb3
CSS text-edge values are Nightly-only in Firefox
caugner Jul 8, 2026
ab05382
Schemeful SameSite is Nightly-only in Firefox
caugner Jul 8, 2026
b5e857b
Permissions.revoke() is no longer available in Firefox
caugner Jul 8, 2026
c655b27
The :-moz-submit-invalid selector is no longer available in Firefox
caugner Jul 8, 2026
a5dd84d
Remove non-standard Screen.mozBrightness and Screen.mozEnabled
caugner Jul 8, 2026
99bcd95
Remove content: none for elements (never shipped)
caugner Jul 8, 2026
f71026a
The :heading selector is not available in Firefox; remove :heading()
caugner Jul 8, 2026
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18 changes: 3 additions & 15 deletions api/Document.json
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Original file line number Diff line number Diff line change
Expand Up @@ -8853,21 +8853,9 @@
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": [
{
"version_added": "preview"
},
{
"version_added": "140",
"flags": [
{
"type": "preference",
"name": "dom.viewTransitions.enabled",
"value_to_set": "true"
}
]
}
],
"firefox": {
"version_added": "144"
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
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36 changes: 4 additions & 32 deletions api/Navigator.json
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Original file line number Diff line number Diff line change
Expand Up @@ -572,14 +572,7 @@
}
],
"firefox": {
"version_added": "96",
"flags": [
{
"type": "preference",
"name": "dom.webshare.enabled",
"value_to_set": "true"
}
]
"version_added": "preview"
},
"firefox_android": {
"version_added": "96"
Expand Down Expand Up @@ -671,14 +664,7 @@
"version_added": "81"
},
"firefox": {
"version_added": "96",
"flags": [
{
"type": "preference",
"name": "dom.webshare.enabled",
"value_to_set": "true"
}
]
"version_added": "preview"
},
"firefox_android": {
"version_added": "96"
Expand Down Expand Up @@ -5140,14 +5126,7 @@
}
],
"firefox": {
"version_added": "71",
"flags": [
{
"type": "preference",
"name": "dom.webshare.enabled",
"value_to_set": "true"
}
]
"version_added": "preview"
},
"firefox_android": {
"version_added": "79"
Expand Down Expand Up @@ -5241,14 +5220,7 @@
"version_added": "81"
},
"firefox": {
"version_added": "71",
"flags": [
{
"type": "preference",
"name": "dom.webshare.enabled",
"value_to_set": "true"
}
]
"version_added": "preview"
},
"firefox_android": {
"version_added": "79"
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22 changes: 5 additions & 17 deletions api/Notification.json
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Original file line number Diff line number Diff line change
Expand Up @@ -1075,23 +1075,11 @@
"edge": {
"version_added": "17"
},
"firefox": [
{
"version_added": "117",
"partial_implementation": true,
"notes": "Only supported on Windows. Behind a flag on other operating systems."
},
{
"version_added": "117",
"flags": [
{
"type": "preference",
"name": "dom.webnotifications.requireinteraction.enabled",
"value_to_set": "true"
}
]
}
],
"firefox": {
"version_added": "117",
"partial_implementation": true,
"notes": "Supported on Windows since Firefox 117 and on Linux since Firefox 137. On macOS, only available in Nightly builds."

@caugner caugner Jul 9, 2026

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Should keep the same approach as before, with two statements.

},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
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20 changes: 4 additions & 16 deletions api/Permissions.json
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Original file line number Diff line number Diff line change
Expand Up @@ -1124,22 +1124,10 @@
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": [
{
"version_added": "51",
"flags": [
{
"type": "preference",
"name": "dom.permissions.revoke.enable",
"value_to_set": "true"
}
]
},
{
"version_added": "47",
"version_removed": "51"
}
],
"firefox": {
"version_added": "47",
"version_removed": "51"
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
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76 changes: 0 additions & 76 deletions api/Screen.json
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Original file line number Diff line number Diff line change
Expand Up @@ -526,82 +526,6 @@
}
}
},
"mozBrightness": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/API/Screen/mozBrightness",
"support": {
"chrome": {
"version_added": false
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": "12",
"flags": [
{
"type": "preference",
"name": "dom.screenBrightnessProperty.enabled",
"value_to_set": "true"
}
]
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": false,
"deprecated": true
}
}
},
"mozEnabled": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/API/Screen/mozEnabled",
"support": {
"chrome": {
"version_added": false
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": "12",
"flags": [
{
"type": "preference",
"name": "dom.screenEnabledProperty.enabled",
"value_to_set": "true"
}
]
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": false,
"deprecated": true
}
}
},
"orientation": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/API/Screen/orientation",
Expand Down
9 changes: 1 addition & 8 deletions css/at-rules/keyframes.json
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Expand Up @@ -154,14 +154,7 @@
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": "152",
"flags": [
{
"type": "preference",
"name": "layout.css.scroll-driven-animations.enabled",
"value_to_set": "true"
}
],
"version_added": "preview",
"impl_url": "https://bugzil.la/1824875"
},
"firefox_android": "mirror",
Expand Down
41 changes: 0 additions & 41 deletions css/properties/content.json
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Original file line number Diff line number Diff line change
Expand Up @@ -440,47 +440,6 @@
}
}
},
"none_applies_to_elements": {
"__compat": {
"description": "`content: none` for elements",
"spec_url": "https://drafts.csswg.org/css-content/#valdef-content-none",
"tags": [
"web-features:content"
],
"support": {
"chrome": {
"version_added": false
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": "91",
"flags": [
{
"type": "preference",
"name": "layout.css.element-content-none.enabled"
}
]
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
},
"normal": {
"__compat": {
"spec_url": "https://drafts.csswg.org/css-content/#valdef-content-normal",
Expand Down
21 changes: 4 additions & 17 deletions css/selectors/-moz-submit-invalid.json
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Expand Up @@ -11,23 +11,10 @@
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": [
{
"version_added": "88",
"flags": [
{
"type": "preference",
"name": "layout.css.moz-submit-invalid.enabled",
"value_to_set": "true"
}
],
"notes": "From Firefox 88 the feature has been placed behind a flag. See [bug 1694129](https://bugzil.la/1694129)."
},
{
"version_added": "4",
"version_removed": "88"
}
],
"firefox": {
"version_added": "4",
"version_removed": "88"
},
"firefox_android": {
"version_added": "4",
"version_removed": "88",
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9 changes: 1 addition & 8 deletions css/selectors/heading.json
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Expand Up @@ -16,14 +16,7 @@
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": "preview",
"flags": [
{
"type": "preference",
"name": "layout.css.heading-selector.enabled",
"value_to_set": "true"
}
]
"version_added": false
},
"firefox_android": "mirror",
"oculus": "mirror",
Expand Down
48 changes: 0 additions & 48 deletions css/selectors/headingfunction.json
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