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1:43 PM

Intent to Ship: Module Service Workers

As of Firefox 147, I plan to ship support for module scripts for service workers (Bugzilla). This has

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Intent to Ship: Module Service Workers

As of Firefox 147, I plan to ship support for module scripts for service workers (Bugzilla). This has

1:43 PM

Yoshi Cheng-Hao Huang, Nicolas Chevobbe2

8:06 AM

Intent to prototype: Deferred Imports Evaluation

Thanks Yoshi for working on this Note that we do have a DevTools bug (https://bugzilla.mozilla.org/

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Intent to prototype: Deferred Imports Evaluation

Thanks Yoshi for working on this Note that we do have a DevTools bug (https://bugzilla.mozilla.org/

8:06 AM

Nov 13

Intent to ship: Iterator Sequencing

Iterator Sequencing will ship in Firefox 147, not 146 as originally planned. On Tue, Oct 14, 2025 at

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Intent to ship: Iterator Sequencing

Iterator Sequencing will ship in Firefox 147, not 146 as originally planned. On Tue, Oct 14, 2025 at

Nov 13

Nov 13

Intent to ship: CSS Module Scripts

As of Firefox 147, I intend to enable support for CSS Module Scripts by default on all platforms. It

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Intent to ship: CSS Module Scripts

As of Firefox 147, I intend to enable support for CSS Module Scripts by default on all platforms. It

Nov 13

Emilio Cobos Álvarez, Andrew McCreight3

Nov 12

PSA: Gecko now uses C++20

On Wed, Nov 12, 2025 at 10:47 AM 'Emilio Cobos Álvarez' via dev-pl...@mozilla.org <dev-

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PSA: Gecko now uses C++20

On Wed, Nov 12, 2025 at 10:47 AM 'Emilio Cobos Álvarez' via dev-pl...@mozilla.org <dev-

Nov 12

Emily McDonough

Nov 10

text-decorationt-trim renamed to text-decoration-inset

The text-decoration-trim property (enabled in Firefox 146 by https://bugzilla.mozilla.org/1993043)

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text-decorationt-trim renamed to text-decoration-inset

The text-decoration-trim property (enabled in Firefox 146 by https://bugzilla.mozilla.org/1993043)

Nov 10

Nov 10

Soft code freeze for Firefox 146 starts on Thursday, November 6 @ 8am UTC

The version bump to 147 has now landed on firefox-main and the soft freeze period is over. Thank you,

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Soft code freeze for Firefox 146 starts on Thursday, November 6 @ 8am UTC

The version bump to 147 has now landed on firefox-main and the soft freeze period is over. Thank you,

Nov 10

Nov 10

Searchfox Update: Field layout for template, opt build data, GC hazard analysis, and TOML/YAML/moz.build support

Hello Searchfox users! We have multiple new features in Searchfox! (1) (alpha-only) Template super

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Searchfox Update: Field layout for template, opt build data, GC hazard analysis, and TOML/YAML/moz.build support

Hello Searchfox users! We have multiple new features in Searchfox! (1) (alpha-only) Template super

Nov 10

Manuel Bucher, Lindsay Hall3

Nov 7

Intent to prototype: Storage-Access-Headers

Hi, The plan is to ship Storage-Access-Headers before or alongside "Strict Same-Origin policy

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Intent to prototype: Storage-Access-Headers

Hi, The plan is to ship Storage-Access-Headers before or alongside "Strict Same-Origin policy

Nov 7

Nov 7

Intent to prototype and ship: Navigation API

As of Firefox 147, I intend to turn on support for the Navigation API for all platforms supporting

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Intent to prototype and ship: Navigation API

As of Firefox 147, I intend to turn on support for the Navigation API for all platforms supporting

Nov 7

Emilio Cobos Álvarez, … Sam Davis Omekara3

Nov 6

Intent to prototype and ship: Untangle computed values of border / outline / column-rule widths and style

Thanks for the tag. As Kevin mentioned, aside from the inherit bug on the Blink side, we should be

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Intent to prototype and ship: Untangle computed values of border / outline / column-rule widths and style

Thanks for the tag. As Kevin mentioned, aside from the inherit bug on the Blink side, we should be

Nov 6

Nov 6

PSA: Improvements to Uplift Requests in Lando

Hey folks, tl;dr: Lando uplift requests now support selecting multiple trains at once, run early

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PSA: Improvements to Uplift Requests in Lando

Hey folks, tl;dr: Lando uplift requests now support selecting multiple trains at once, run early

Nov 6

Gregory Mierzwinski

Nov 4

Changes to CI Performance/Perfherder Data Ingestion

Hello, Over the last couple months, we've been working on moving all of our performance/

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Changes to CI Performance/Perfherder Data Ingestion

Hello, Over the last couple months, we've been working on moving all of our performance/

Nov 4

Diego Escalante

Oct 31

Intent to Ship: Scoped Styles (@scope)

Summary: Scoped styles let users limit styling to DOM subtrees (Which can be further limited to a

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Intent to Ship: Scoped Styles (@scope)

Summary: Scoped styles let users limit styling to DOM subtrees (Which can be further limited to a

Oct 31

Oct 31

A new way to run development builds with a temporary profiles.ini

When you run a development version of Firefox with `./mach run` it runs with a temporary profile but

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A new way to run development builds with a temporary profiles.ini

When you run a development version of Firefox with `./mach run` it runs with a temporary profile but

Oct 31

Florian Quèze, Emilio Cobos Álvarez3

Oct 30

Crashes happening during tests just became easier to look at

On Wed, Oct 29, 2025 at 9:05 PM Emilio Cobos Álvarez <emi...@mozilla.com> wrote: I wonder if

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Crashes happening during tests just became easier to look at

On Wed, Oct 29, 2025 at 9:05 PM Emilio Cobos Álvarez <emi...@mozilla.com> wrote: I wonder if

Oct 30

Vincent Hilla, Nicolas Chevobbe2

Oct 29

Intent to prototype: Document Picture-in-Picture API

Hello Vincent, I think you forgot to link to the bug that covers that work, if I'm correct this

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Intent to prototype: Document Picture-in-Picture API

Hello Vincent, I think you forgot to link to the bug that covers that work, if I'm correct this

Oct 29

Oct 28

Firefox Security & Privacy Newsletter - Q3 2025

Welcome to the Q3 2025 edition of the Firefox Security and Privacy newsletter! Security and Privacy

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Firefox Security & Privacy Newsletter - Q3 2025

Welcome to the Q3 2025 edition of the Firefox Security and Privacy newsletter! Security and Privacy

Oct 28

Daniel Holbert, 一丝4

Oct 27

Intent to ship: CSS '-webkit-fill-available' sizing keyword in the 'height' and 'width' properties

update: due to a few bugs, we've gone back to disabling this feature by-default on 145 (currently

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Intent to ship: CSS '-webkit-fill-available' sizing keyword in the 'height' and 'width' properties

update: due to a few bugs, we've gone back to disabling this feature by-default on 145 (currently

Oct 27

Emilio Cobos Álvarez

Oct 27

Intent to prototype and ship: display-p3-linear color space for CSS colors

Hi, In bug 1996318 I'm adding the display-p3-linear color space to CSS colors. This is a

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Intent to prototype and ship: display-p3-linear color space for CSS colors

Hi, In bug 1996318 I'm adding the display-p3-linear color space to CSS colors. This is a

Oct 27

Jonathan Kew, Nicolas Chevobbe2

Oct 27

Intent to prototype & ship: CSS contrast-color() function

Thanks for sending this Jonathan. I filed a bug for DevTools support as this might break a few things

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Intent to prototype & ship: CSS contrast-color() function

Thanks for sending this Jonathan. I filed a bug for DevTools support as this might break a few things

Oct 27

Sebastian Hengst

Oct 26

Try pushes: re-push for recent submissions needed

If you pushed changes for testing to Try between Friday 10:30pm UTC / 6:30pm EDT / 3:30pm PDT and

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Try pushes: re-push for recent submissions needed

If you pushed changes for testing to Try between Friday 10:30pm UTC / 6:30pm EDT / 3:30pm PDT and

Oct 26

Oct 24

Shorter xpcshell test timeouts

tl;dr: xpcshell tests now timeout by default in 30s instead of 5 minutes and you might need to add

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Shorter xpcshell test timeouts

tl;dr: xpcshell tests now timeout by default in 30s instead of 5 minutes and you might need to add

Oct 24

Oct 23

Intent to prototype and ship: HTMLInputElement showPicker() for textual input with datalist

Summary: showPicker enables showing pickers for types such as file or color programmatically. We

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Intent to prototype and ship: HTMLInputElement showPicker() for textual input with datalist

Summary: showPicker enables showing pickers for types such as file or color programmatically. We

Oct 23

Alex Hochheiden

Oct 17

Announcing MozillaBuild 4.2.1 Release

MozillaBuild 4.2.1 contains a major version bump for 7zip going from version 18.05 to 25.01. Links:

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Announcing MozillaBuild 4.2.1 Release

MozillaBuild 4.2.1 contains a major version bump for 7zip going from version 18.05 to 25.01. Links:

Oct 17

Ting-Yu Lin 林庭宇, 一丝3

Oct 17

Intent to ship: CSS text-autospace property

Thank you for all the hard work you and Firefox have put in, which has greatly benefited the vast CJK

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Intent to ship: CSS text-autospace property

Thank you for all the hard work you and Firefox have put in, which has greatly benefited the vast CJK

Oct 17

Oct 17

Intent to prototype: Sanitizer API

Summary: The Sanitizer API provides new methods for HTML manipulation. As an example, element.setHTML

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Intent to prototype: Sanitizer API

Summary: The Sanitizer API provides new methods for HTML manipulation. As an example, element.setHTML

Oct 17

Eri Pazos Pérez

Oct 14

Intent to ship: Mirroring of RTL MathML operators

As of today (2025-10-14), I intend to turn support for mirroring RTL MathML stretchy operators using

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Intent to ship: Mirroring of RTL MathML operators

As of today (2025-10-14), I intend to turn support for mirroring RTL MathML stretchy operators using

Oct 14

Eri Pazos Pérez

Oct 14

Intent to ship: MathML Core math-shift: compact

As of today (2025-10-14), I intend to turn support for math-shift: compact on by default. It has been

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Intent to ship: MathML Core math-shift: compact

As of today (2025-10-14), I intend to turn support for math-shift: compact on by default. It has been

Oct 14

Pascal Chevrel2

Oct 13

Soft code freeze for Firefox 145 starts on Thursday, October 9 @ 8am UTC (replaces previous email)

The version bump to 146 has now landed on mozilla-central and the soft freeze period is over. Thanks,

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Soft code freeze for Firefox 145 starts on Thursday, October 9 @ 8am UTC (replaces previous email)

The version bump to 146 has now landed on mozilla-central and the soft freeze period is over. Thanks,

Oct 13

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