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Apr 1

New Feature: --auto Flag Now Available for mach test

Hello, We recently landed a new feature in mach test: the --auto flag. This allows ./mach test to use

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New Feature: --auto Flag Now Available for mach test

Hello, We recently landed a new feature in mach test: the --auto flag. This allows ./mach test to use

Apr 1

Hiroyuki Ikezoe, Mike Taylor2

Mar 26

Intent to ship: limited ::-webkit-scrollbar support

On 3/25/26 6:25 pm, 'Hiroyuki Ikezoe' via dev-pl...@mozilla.org wrote: I intend to ship

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Intent to ship: limited ::-webkit-scrollbar support

On 3/25/26 6:25 pm, 'Hiroyuki Ikezoe' via dev-pl...@mozilla.org wrote: I intend to ship

Mar 26

Emilio Cobos Álvarez

Mar 26

Intent to prototype and ship: CSSContainerRule.conditions

Hi, In bug 2022827 and related, we're adding support for multiple container conditions within a

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Intent to prototype and ship: CSSContainerRule.conditions

Hi, In bug 2022827 and related, we're adding support for multiple container conditions within a

Mar 26

Mar 24

Intent to prototype & ship: Canvas2D 'lang' attribute

As of Firefox 151, I intend to implement and ship the 'lang' attribute for Canvas2D text.

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Intent to prototype & ship: Canvas2D 'lang' attribute

As of Firefox 151, I intend to implement and ship the 'lang' attribute for Canvas2D text.

Mar 24

Marco Castelluccio, … Nicolas Qiu Guichard7

Mar 23

Code coverage data is now exclusively in Searchfox

Hi Frederik and all, Le vendredi 13 mars 2026, 10:59:57 heure normale d'Europe centrale Frederik

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Code coverage data is now exclusively in Searchfox

Hi Frederik and all, Le vendredi 13 mars 2026, 10:59:57 heure normale d'Europe centrale Frederik

Mar 23

Tiaan Louw, glob2

Mar 19

Intent to Ship: multi-color color-mix()

I'm trying to find the intent-to-prototype thread associated with this change but my Google-fu is

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Intent to Ship: multi-color color-mix()

I'm trying to find the intent-to-prototype thread associated with this change but my Google-fu is

Mar 19

Olivier (shtrom) Mehani, Mathew Hodson7

Mar 18

Lando now only accepts logins from LDAP accounts

On Friday, March 13, 2026 at 12:16:00 am UTC-4 ome...@mozilla.com wrote: This led to confusing

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Lando now only accepts logins from LDAP accounts

On Friday, March 13, 2026 at 12:16:00 am UTC-4 ome...@mozilla.com wrote: This led to confusing

Mar 18

Mar 17

PerfCompare: Default statistical method is now Mann-Whitney-U

Hello everyone, PerfCompare has switched the default statistical method from Student-T to Mann-

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PerfCompare: Default statistical method is now Mann-Whitney-U

Hello everyone, PerfCompare has switched the default statistical method from Student-T to Mann-

Mar 17

Emilio Cobos Álvarez

Mar 16

Intent to ship: light-dark() for CSS images

Hi, In bug 2023569 I plan to enable by default `light-dark()` for CSS image values. This was

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Intent to ship: light-dark() for CSS images

Hi, In bug 2023569 I plan to enable by default `light-dark()` for CSS image values. This was

Mar 16

Mar 13

Use SpecialPowers.spawn to run tasks in content processes from tests

We currently have two different methods for running tasks in content processes from tests.

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Use SpecialPowers.spawn to run tasks in content processes from tests

We currently have two different methods for running tasks in content processes from tests.

Mar 13

Mar 12

Intent to unship: Korean search collations

The exact mechanics didn't end up matching the path that was contemplated, but it terms of what

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Intent to unship: Korean search collations

The exact mechanics didn't end up matching the path that was contemplated, but it terms of what

Mar 12

Emilio Cobos Álvarez

Mar 3

Intent to prototype and ship: CSS revert-rule keyword

Summary: Add a CSS-wide keyword that allows reversing a single rule from the cascade, rather than a

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Intent to prototype and ship: CSS revert-rule keyword

Summary: Add a CSS-wide keyword that allows reversing a single rule from the cascade, rather than a

Mar 3

Gabriele Svelto

Mar 3

macOS system symbols are now scraped automatically

[cross-posting to stability] Hello all, I'm glad to inform you that symbol information for macOS

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macOS system symbols are now scraped automatically

[cross-posting to stability] Hello all, I'm glad to inform you that symbol information for macOS

Mar 3

Emilio Cobos Álvarez

Feb 27

Intent to prototype: Use SkPDF as our default print-to-pdf back-end

Hi all, In bug 2020017, I plan to start testing the SkPDF back-end on Nightly builds for print-to-pdf

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Intent to prototype: Use SkPDF as our default print-to-pdf back-end

Hi all, In bug 2020017, I plan to start testing the SkPDF back-end on Nightly builds for print-to-pdf

Feb 27

Frédéric Wang

Feb 22

Intent to unship: Adjustment of default MathML operator lspace/rspace when math-depth > 0

As of Firefox 150, I intend to remove adjustment of default MathML operator lspace/rspace when math-

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Intent to unship: Adjustment of default MathML operator lspace/rspace when math-depth > 0

As of Firefox 150, I intend to remove adjustment of default MathML operator lspace/rspace when math-

Feb 22

Feb 19

Intent to ship: ariaNotify

As of Firefox 150, I intend to turn ariaNotify on by default on all platforms. It has been developed

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Intent to ship: ariaNotify

As of Firefox 150, I intend to turn ariaNotify on by default on all platforms. It has been developed

Feb 19

Feb 19

Intent to prototype & ship document.caretRangeFromPoint

Summary: caretRangeFromPoint is a non-standard API for obtaining a Range object (node and position

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Intent to prototype & ship document.caretRangeFromPoint

Summary: caretRangeFromPoint is a non-standard API for obtaining a Range object (node and position

Feb 19

Feb 18

Intent to Ship: HTMLMediaElement.captureStream

Starting with Firefox 149, HTMLMediaElement.captureStream() will be enabled by default. captureStream

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Intent to Ship: HTMLMediaElement.captureStream

Starting with Firefox 149, HTMLMediaElement.captureStream() will be enabled by default. captureStream

Feb 18

Keith Cirkel, Nicolas Chevobbe3

Feb 17

Intent to Ship: CloseWatcher

We delayed shipping this due to Android support - it has been shipping in Desktop Nightly since ~140.

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Intent to Ship: CloseWatcher

We delayed shipping this due to Android support - it has been shipping in Desktop Nightly since ~140.

Feb 17

Feb 13

The next Nightly on Windows will be using the parent binary for GMP processes

Well that didn't last long. This has been disabled by default after Bug 2016525 was reported. On

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The next Nightly on Windows will be using the parent binary for GMP processes

Well that didn't last long. This has been disabled by default after Bug 2016525 was reported. On

Feb 13

Ryan VanderMeulen

Feb 11

Nightly soft freeze discontinuation and updated Beta schedule starting with Firefox 149

Hi everyone, We're making a release process change to reduce end-of-cycle friction in Nightly and

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Nightly soft freeze discontinuation and updated Beta schedule starting with Firefox 149

Hi everyone, We're making a release process change to reduce end-of-cycle friction in Nightly and

Feb 11

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

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