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Frédéric Wang

Feb 5

Intent to Ship: font-family: math

As of today (2026-02-05), we intend to turn support for font-family: math on by default. It has been

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Intent to Ship: font-family: math

As of today (2026-02-05), we intend to turn support for font-family: math on by default. It has been

Feb 5

Feb 3

Intent to Ship: Popover=hint

Summary: Support for the additional ephemeral (hint) popover layer with `popover=hint` attribute Bug:

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Intent to Ship: Popover=hint

Summary: Support for the additional ephemeral (hint) popover layer with `popover=hint` attribute Bug:

Feb 3

Jan 30

Firefox Security & Privacy Newsletter Q4 2025

Welcome to the Q4 2025 edition of the Firefox Security & Privacy Newsletter. Security and privacy

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Firefox Security & Privacy Newsletter Q4 2025

Welcome to the Q4 2025 edition of the Firefox Security & Privacy Newsletter. Security and privacy

Jan 30

Simon Farre, Nicolas Chevobbe2

Jan 29

Intent to prototype & ship Reporting API

At the moment, the Reporting API report requests are not visible in the DevTools Netmonitor for the

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Intent to prototype & ship Reporting API

At the moment, the Reporting API report requests are not visible in the DevTools Netmonitor for the

Jan 29

Kagami Rosylight, … Jake Archibald4

Jan 28

Intent to prototype: JPEG XL decoding in Rust

I don't have a CLI benchmark unfortunately, just https://random-stuff.jakearchibald.com/apps/img-

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Intent to prototype: JPEG XL decoding in Rust

I don't have a CLI benchmark unfortunately, just https://random-stuff.jakearchibald.com/apps/img-

Jan 28

Jan 22

Fwd: [NOTICE] FirefoxCI Scheduled Downtime with Trees Closed (Jan 22)

Maintenance is now complete! If you ran into any issues running FxCI tasks in your GitHub integration

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Fwd: [NOTICE] FirefoxCI Scheduled Downtime with Trees Closed (Jan 22)

Maintenance is now complete! If you ran into any issues running FxCI tasks in your GitHub integration

Jan 22

Jan 19

Intent to Prototype: Container Timing API

Summary: The Container Timing API enables monitoring when annotated sections of the DOM are displayed

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Intent to Prototype: Container Timing API

Summary: The Container Timing API enables monitoring when annotated sections of the DOM are displayed

Jan 19

Jan 18

Intent to prototype and ship: CSS vertical-align shorthand, alignment-baseline, and baseline-shift

Summary: The CSS Inline Layout Module Level 3 specification converts the existing vertical-align

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Intent to prototype and ship: CSS vertical-align shorthand, alignment-baseline, and baseline-shift

Summary: The CSS Inline Layout Module Level 3 specification converts the existing vertical-align

Jan 18

Jan 15

Intent to prototype: ariaNotify

Summary: An imperative API for accessibility notifications as a more ergonomic and reliable

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Intent to prototype: ariaNotify

Summary: An imperative API for accessibility notifications as a more ergonomic and reliable

Jan 15

Kagami Rosylight

Jan 14

Intent to ship: colorspace and alpha attributes for `<input type=color>`

Summary: The new colorspace and alpha attributes controls the output by color picking, eg using the

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Intent to ship: colorspace and alpha attributes for `<input type=color>`

Summary: The new colorspace and alpha attributes controls the output by color picking, eg using the

Jan 14

Jan 13

Engineering Effectiveness Newsletter (Q4 2025 Edition)

Welcome to the Q4 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness

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Engineering Effectiveness Newsletter (Q4 2025 Edition)

Welcome to the Q4 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness

Jan 13

Keith Cirkel, Nicolas Chevobbe2

Jan 13

Intent to Prototype: "Customizable Select"

That's great to hear, really looking forward being able to do more with selects :) I filed https:

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Intent to Prototype: "Customizable Select"

That's great to hear, really looking forward being able to do more with selects :) I filed https:

Jan 13

Jan 12

Soft code freeze for Firefox 148 starts on January 8

The version bump to 149 has now landed on mozilla-central and the soft freeze period is over. Thanks,

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Soft code freeze for Firefox 148 starts on January 8

The version bump to 149 has now landed on mozilla-central and the soft freeze period is over. Thanks,

Jan 12

Greg Stoll, … Thomas Steiner3

Jan 8

Intent to prototype: Add-On-Gated Web Serial

On Tue, Dec 23, 2025 at 4:28 PM 'Kagami Rosylight' via dev-pl...@mozilla.org <dev-

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Intent to prototype: Add-On-Gated Web Serial

On Tue, Dec 23, 2025 at 4:28 PM 'Kagami Rosylight' via dev-pl...@mozilla.org <dev-

Jan 8

Jan 2

Intent to prototype: HTMLMediaElement.captureStream()

Summary: `HTMLMediaElement.captureStream()` is a standards-based API that exposes a `MediaStream`

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Intent to prototype: HTMLMediaElement.captureStream()

Summary: `HTMLMediaElement.captureStream()` is a standards-based API that exposes a `MediaStream`

Jan 2

Kagami Rosylight

12/23/25

Intent to prototype: Replacing <input type=color> picker with in-browser popup

As of 2025-12-21 I intend to replace the current platform-specific color picker with a common cross-

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Intent to prototype: Replacing <input type=color> picker with in-browser popup

As of 2025-12-21 I intend to replace the current platform-specific color picker with a common cross-

12/23/25

Keith Cirkel, … Nicolas Chevobbe4

12/18/25

Intent to Prototype: CSS gradient easing functions

No bug yet, but a WIP patch for folks to try is here: https://phabricator.services.mozilla.com/

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Intent to Prototype: CSS gradient easing functions

No bug yet, but a WIP patch for folks to try is here: https://phabricator.services.mozilla.com/

12/18/25

12/16/25

Intent to ship: Sanitizer API

As of Firefox 148, we intend to turn on the HTML Sanitizer API. Summary: Right now, to sanitize a

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Intent to ship: Sanitizer API

As of Firefox 148, we intend to turn on the HTML Sanitizer API. Summary: Right now, to sanitize a

12/16/25

Swarup Ukil, Nicolas Chevobbe2

12/16/25

Intent to prototype and ship: support shape() in basic-shape

Thanks Swarup for investigating this, it's exciting The DevTools bug you pointed to (https://

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Intent to prototype and ship: support shape() in basic-shape

Thanks Swarup for investigating this, it's exciting The DevTools bug you pointed to (https://

12/16/25

12/12/25

Intent to ship: Branch hinting

As of Firefox 148, I intend to enable the WebAssembly Branch Hinting proposal by default on all

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Intent to ship: Branch hinting

As of Firefox 148, I intend to enable the WebAssembly Branch Hinting proposal by default on all

12/12/25

Manuel Bucher, Lindsay Hall4

12/12/25

Intent to prototype: Storage-Access-Headers

Summary: Storage-Access-Headers allows servers to opt-in into unpartitioned cookies via HTTP headers

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Intent to prototype: Storage-Access-Headers

Summary: Storage-Access-Headers allows servers to opt-in into unpartitioned cookies via HTTP headers

12/12/25

Frédéric Wang, … Mathew Hodson4

12/11/25

Intent to ship: Trusted Types

On Tuesday, December 9, 2025 at 12:20:44 pm UTC-5 egu...@mozilla.com wrote: https://w3c.github.io/

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Intent to ship: Trusted Types

On Tuesday, December 9, 2025 at 12:20:44 pm UTC-5 egu...@mozilla.com wrote: https://w3c.github.io/

12/11/25

12/10/25

Intent to unship: asm.js optimizations

As of Firefox 148 I intend to disable asm.js optimizations for all platforms. asm.js [1] is the

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Intent to unship: asm.js optimizations

As of Firefox 148 I intend to disable asm.js optimizations for all platforms. asm.js [1] is the

12/10/25

Masayuki Nakano

12/9/25

Intent to ship: `movementX` and `movementY` of `pointerrawupdate` event

Currently, ` movementX ` and ` movementY ` are supported only when ` mousemove ` or ` pointermove `

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Intent to ship: `movementX` and `movementY` of `pointerrawupdate` event

Currently, ` movementX ` and ` movementY ` are supported only when ` mousemove ` or ` pointermove `

12/9/25

12/9/25

Intent to ship: Joint Iteration

As of Firefox 148, I intend to enable the Joint Iteration proposal by default on all platforms. It is

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Intent to ship: Joint Iteration

As of Firefox 148, I intend to enable the Joint Iteration proposal by default on all platforms. It is

12/9/25

Ryan VanderMeulen2

12/8/25

Soft code freeze for Firefox 147 starts on Thursday, December 4 @ 8am UTC

The version bump to 148 has now landed on firefox-main and the soft freeze period is over. Thank you,

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Soft code freeze for Firefox 147 starts on Thursday, December 4 @ 8am UTC

The version bump to 148 has now landed on firefox-main and the soft freeze period is over. Thank you,

12/8/25

12/4/25

PerfCompare Statistics Project Update

Hello everyone, Perftools has successfully completed the first part of the PerfCompare Statistics

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PerfCompare Statistics Project Update

Hello everyone, Perftools has successfully completed the first part of the PerfCompare Statistics

12/4/25

Emilio Cobos Álvarez

12/4/25

Intent to prototype and ship: overflow-clip-margin: <visual-box> and allow replaced elements to overflow their content box

Hi, In bug 1999100 I plan to (after the soft-freeze) land support for overflow-clip-margin: <

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Intent to prototype and ship: overflow-clip-margin: <visual-box> and allow replaced elements to overflow their content box

Hi, In bug 1999100 I plan to (after the soft-freeze) land support for overflow-clip-margin: <

12/4/25

Emilio Cobos Álvarez

12/4/25

Intent to prototype and ship: rch, rex, rcap, and ric CSS units

Summary: Few new CSS units for root-relative font metrics. Other browsers already implemented these

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Intent to prototype and ship: rch, rex, rcap, and ric CSS units

Summary: Few new CSS units for root-relative font metrics. Other browsers already implemented these

12/4/25

Jonathan Watt, … Emilio Cobos Álvarez3

12/3/25

Intent to ship: CSS Anchor Positioning

This is only the initial release (think of it as an MVP), so yeah, expect further updates to follow

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Intent to ship: CSS Anchor Positioning

This is only the initial release (think of it as an MVP), so yeah, expect further updates to follow

12/3/25

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