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Gregory Mierzwinski

8:51 AM

Telemetry Alerting Beta Now Open

Hello, We're excited to announce that the telemetry alerting beta is now open to everyone! Simply

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Telemetry Alerting Beta Now Open

Hello, We're excited to announce that the telemetry alerting beta is now open to everyone! Simply

8:51 AM

Emilio Cobos Álvarez, … Dave Townsend9

Apr 21

PSA: Node ownerGlobal changes

Sounds good. I don't want to bikeshed too much but I'm not sure `relevantGlobal` really

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PSA: Node ownerGlobal changes

Sounds good. I don't want to bikeshed too much but I'm not sure `relevantGlobal` really

Apr 21

Apr 17

Firefox Security & Privacy Newsletter Q1 2026

Welcome to the Q1 2026 edition of the Firefox Security & Privacy Newsletter. Security and privacy

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Firefox Security & Privacy Newsletter Q1 2026

Welcome to the Q1 2026 edition of the Firefox Security & Privacy Newsletter. Security and privacy

Apr 17

Olivier (shtrom) Mehani

Apr 16

`mach try` now uses the new lando instance

Hi all, tl;dr: No action needed, this should be transparent. Do report any issue, and bypass with `

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`mach try` now uses the new lando instance

Hi all, tl;dr: No action needed, this should be transparent. Do report any issue, and bypass with `

Apr 16

Apr 15

QR Codes, Speed Calculators, Better RAM Usage - These Weeks in Firefox: Issue 199

Hello firefox-dev, A few weeks ago, the Firefox Desktop team got together and compared notes on the

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QR Codes, Speed Calculators, Better RAM Usage - These Weeks in Firefox: Issue 199

Hello firefox-dev, A few weeks ago, the Firefox Desktop team got together and compared notes on the

Apr 15

Andrew Halberstadt2

Apr 12

[NOTICE] FirefoxCI Scheduled Downtime with Trees Closed (Sun April 12th)

The scheduled migration is complete. Please reach out in #Firefox-CI on Matrix if you're seeing

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[NOTICE] FirefoxCI Scheduled Downtime with Trees Closed (Sun April 12th)

The scheduled migration is complete. Please reach out in #Firefox-CI on Matrix if you're seeing

Apr 12

Apr 7

Engineering Effectiveness Newsletter (Q1 2026 Edition)

Welcome to the Q1 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness

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Engineering Effectiveness Newsletter (Q1 2026 Edition)

Welcome to the Q1 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness

Apr 7

Apr 7

New Feature: Request AI Code Review Directly from moz-phab

Hello, We've added AI-powered code review support to moz-phab! You can now request an AI review

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New Feature: Request AI Code Review Directly from moz-phab

Hello, We've added AI-powered code review support to moz-phab! You can now request an AI review

Apr 7

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

Jonathan Almeida

Mar 20

New and existing changes to try presets for Android

Hi all, With bug 2012189 landing, there is a new preset named `android-fullstack` that combines and

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New and existing changes to try presets for Android

Hi all, With bug 2012189 landing, there is a new preset named `android-fullstack` that combines and

Mar 20

Katherine Patenio

Mar 20

Extension Theming Improvements and More - These Weeks in Firefox: Issue 198

Hello firefox-dev, We're back to share more Firefox Desktop updates, this time from our

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Extension Theming Improvements and More - These Weeks in Firefox: Issue 198

Hello firefox-dev, We're back to share more Firefox Desktop updates, this time from our

Mar 20

Katherine Patenio

Mar 17

Firefox Profiler Dark Mode and Updated Smart Window Prompts - These Weeks in Firefox: Issue 197

Hi firefox-dev, Continuing from Mike Conley's previous "These Weeks in Firefox" email

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Firefox Profiler Dark Mode and Updated Smart Window Prompts - These Weeks in Firefox: Issue 197

Hi firefox-dev, Continuing from Mike Conley's previous "These Weeks in Firefox" email

Mar 17

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

Mar 16

New C++ and Rust functions for comparing user-visible strings for sorting in the UI

Hello firefox-dev, There are now new functions in C++ and Rust for comparing user-visible strings

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New C++ and Rust functions for comparing user-visible strings for sorting in the UI

Hello firefox-dev, There are now new functions in C++ and Rust for comparing user-visible strings

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

Olivier (shtrom) Mehani

Mar 13

Lando now only accepts logins from LDAP accounts

Hi all, In the past, it was possible to log in to Lando using Google and Firefox account details. We

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Lando now only accepts logins from LDAP accounts

Hi all, In the past, it was possible to log in to Lando using Google and Firefox account details. We

Mar 13

Mar 9

AI Controls - These Weeks in Firefox: Issue 196

Hello firefox-dev, It's been a few weeks since we posted one of these - apologies, we've got

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AI Controls - These Weeks in Firefox: Issue 196

Hello firefox-dev, It's been a few weeks since we posted one of these - apologies, we've got

Mar 9

Marco Castelluccio, … Tom Schuster3

Mar 5

Code coverage data is now exclusively in Searchfox

Hi! This is very exciting. Thank you and Nicolas for working on this. When can we expect the data on

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Code coverage data is now exclusively in Searchfox

Hi! This is very exciting. Thank you and Nicolas for working on this. When can we expect the data on

Mar 5

Feb 16

Firefox desktop development meeting - 2026-02-17

Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com

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Firefox desktop development meeting - 2026-02-17

Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com

Feb 16

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

Katherine Patenio

Feb 2

Profile, search and wallpaper bug fixes plus more! - These Weeks in Firefox: Issue 195

Hello everyone, Here are the latest Firefox Desktop engineering team updates! See below for a

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Profile, search and wallpaper bug fixes plus more! - These Weeks in Firefox: Issue 195

Hello everyone, Here are the latest Firefox Desktop engineering team updates! See below for a

Feb 2

Katherine Patenio

Feb 2

Firefox desktop development meeting - 2026-02-02

Hello Firefox fans, We have another Firefox Desktop development meeting scheduled for tomorrow. Here

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Firefox desktop development meeting - 2026-02-02

Hello Firefox fans, We have another Firefox Desktop development meeting scheduled for tomorrow. Here

Feb 2

Jan 30

Firefox Security & Privacy Newsletter Q4 2025

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

unread,

Firefox Security & Privacy Newsletter Q4 2025

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

Jan 30

Jan 26

Take note - Split View is ready for testing! - These Weeks in Firefox: Issue 194

Hello all, A few weeks ago, the Firefox Desktop engineering team got together to discuss the latest

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Take note - Split View is ready for testing! - These Weeks in Firefox: Issue 194

Hello all, A few weeks ago, the Firefox Desktop engineering team got together to discuss the latest

Jan 26

Jan 22

[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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[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

Katherine Patenio

Jan 19

Firefox desktop development meeting - 2026-01-20

Hello Firefox fans! Our next bi-weekly Firefox meeting is coming up on Tuesday, January 20. Here are

unread,

Firefox desktop development meeting - 2026-01-20

Hello Firefox fans! Our next bi-weekly Firefox meeting is coming up on Tuesday, January 20. Here are

Jan 19

Jan 13

Engineering Effectiveness Newsletter (Q4 2025 Edition)

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

unread,

Engineering Effectiveness Newsletter (Q4 2025 Edition)

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

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

Jan 6

Firefox desktop development meeting - 2026-01-06

Hello Firefox fans! Here are the details for today's meeting (coming up in about 15 minutes!):

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Firefox desktop development meeting - 2026-01-06

Hello Firefox fans! Here are the details for today's meeting (coming up in about 15 minutes!):

Jan 6

Niklas Baumgardner

12/19/25

Closing out 2025 Strong - These Weeks in Firefox: Issue 193

Hello firefox-dev, The Firefox Desktop engineering team gathered a few weeks ago to share the latest

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Closing out 2025 Strong - These Weeks in Firefox: Issue 193

Hello firefox-dev, The Firefox Desktop engineering team gathered a few weeks ago to share the latest

12/19/25

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