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Julian Descottes
Jul 10
allowMatchingRejectionsGlobally no longer persists after each browser-chrome mochitest
Hi all, With https://bugzilla.mozilla.org/show_bug.cgi?id=1655422, exceptions added by
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allowMatchingRejectionsGlobally no longer persists after each browser-chrome mochitest
Hi all, With https://bugzilla.mozilla.org/show_bug.cgi?id=1655422, exceptions added by
Jul 10
Andrew Halberstadt
Jul 9
Engineering Effectiveness Newsletter (Q2 2026 Edition)
Welcome to the Q2 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness
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Engineering Effectiveness Newsletter (Q2 2026 Edition)
Welcome to the Q2 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness
Jul 9
Sylvestre Ledru
Jul 9
Firefox release cadence experiment: moving to 2 weeks starting in September
Hi everyone, We are planning to move Firefox Desktop and Android from a 4-week release cadence to a 2
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Firefox release cadence experiment: moving to 2 weeks starting in September
Hi everyone, We are planning to move Firefox Desktop and Android from a 4-week release cadence to a 2
Jul 9
Mike Conley
Jul 6
Firefox desktop development meeting cancelled for 2026-07-07
Hey all, Due to an intersecting MoCo meeting, we're cancelling the bi-weekly Firefox Desktop
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Firefox desktop development meeting cancelled for 2026-07-07
Hey all, Due to an intersecting MoCo meeting, we're cancelling the bi-weekly Firefox Desktop
Jul 6
Chris Peterson
Jul 1
Heads up: retiring the "early beta" period
In an effort to make Beta builds more representative of release candidate builds and avoid
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Heads up: retiring the "early beta" period
In an effort to make Beta builds more representative of release candidate builds and avoid
Jul 1
Beth Rennie
, …
Dan Mosedale
6
Jun 25
Support for shared per-task setup and teardown in mochitest tests and xpcshell tests
Good news everyone! This should now be available in all xpcshell and mochitests. Support for
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Support for shared per-task setup and teardown in mochitest tests and xpcshell tests
Good news everyone! This should now be available in all xpcshell and mochitests. Support for
Jun 25
Jared Hirsch
Jun 23
Firefox desktop development meeting - 2026-06-23
Hello Firefox fans! Earlier today we met to discuss recent developments in Firefox. Here are the
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Firefox desktop development meeting - 2026-06-23
Hello Firefox fans! Earlier today we met to discuss recent developments in Firefox. Here are the
Jun 23
Katherine Patenio
Jun 22
Eyedropper Quick Action, geckodriver 0.37, and Tighter File Permissions - These Weeks in Firefox: Issue 205
Hi Firefox fans, Here are the Firefox Desktop engineering notes from our June 9 meeting. We'll
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Eyedropper Quick Action, geckodriver 0.37, and Tighter File Permissions - These Weeks in Firefox: Issue 205
Hi Firefox fans, Here are the Firefox Desktop engineering notes from our June 9 meeting. We'll
Jun 22
Andrew McCreight
Jun 22
new JS actor registration property: safeForUntrustedWebProcess
Hello all, I have added a new property that you may need to use when registering a JS window or
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new JS actor registration property: safeForUntrustedWebProcess
Hello all, I have added a new property that you may need to use when registering a JS window or
Jun 22
Chris H-C
Jun 16
Phabricator Data Reviews: remember to add the bug number
Hello! All new or expanded data collection in Mozilla projects are subject to Data Collection Review[
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Phabricator Data Reviews: remember to add the bug number
Hello! All new or expanded data collection in Mozilla projects are subject to Data Collection Review[
Jun 16
Katherine Patenio
Jun 15
Giving You More Control - These Weeks in Firefox: Issue 204
Hey Firefox fans, On May 26, 2026, the Firefox Desktop team met to discuss what's new in the
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Giving You More Control - These Weeks in Firefox: Issue 204
Hey Firefox fans, On May 26, 2026, the Firefox Desktop team met to discuss what's new in the
Jun 15
Manuel Bucher
Jun 11
Intent-To-Unship: cookieBehavior LIMIT_FOREIGN (3) and REJECT_TRACKER (4)
We intend to remove support for two legacy cookie behaviors in Firefox: cookieBehavior=3 (
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Intent-To-Unship: cookieBehavior LIMIT_FOREIGN (3) and REJECT_TRACKER (4)
We intend to remove support for two legacy cookie behaviors in Firefox: cookieBehavior=3 (
Jun 11
Katherine Patenio
Jun 8
Firefox desktop development meeting - 2026-06-09
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
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Firefox desktop development meeting - 2026-06-09
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
Jun 8
Katherine Patenio
Jun 3
More Kit, More Control – These Weeks in Firefox: Issue 203
Hey firefox-dev, Following Mike Conley's previous "These Weeks in Firefox" email (check
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More Kit, More Control – These Weeks in Firefox: Issue 203
Hey firefox-dev, Following Mike Conley's previous "These Weeks in Firefox" email (check
Jun 3
Mike Conley
Jun 1
Backup for a Rainy Day - These Weeks in Firefox: Issue 202
Hello firefoxd-dev, A few weeks back (April! Whoops, sorry for the delay!), the Firefox Desktop team
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Backup for a Rainy Day - These Weeks in Firefox: Issue 202
Hello firefoxd-dev, A few weeks back (April! Whoops, sorry for the delay!), the Firefox Desktop team
Jun 1
Olivier (shtrom) Mehani
2
May 28
`mach try` now uses the new lando instance
Hi all, More updates on try and new lando. On Thu, 16 Apr 2026 at 16:35, Olivier (shtrom) Mehani <
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`mach try` now uses the new lando instance
Hi all, More updates on try and new lando. On Thu, 16 Apr 2026 at 16:35, Olivier (shtrom) Mehani <
May 28
Mike Conley
May 26
Firefox desktop development meeting - 2026-05-26
Hello Firefox fans! Here are the details for today's meeting (in 30 minutes! Sorry for the late
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Firefox desktop development meeting - 2026-05-26
Hello Firefox fans! Here are the details for today's meeting (in 30 minutes! Sorry for the late
May 26
Bas Schouten
,
Alessio Placitelli
2
May 21
Removed Legacy Mirrors
Great job, Bas! On Wed, 20 May 2026 at 22:39, 'Bas Schouten' via firef...@mozilla.org <
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Removed Legacy Mirrors
Great job, Bas! On Wed, 20 May 2026 at 22:39, 'Bas Schouten' via firef...@mozilla.org <
May 21
Mark Striemer
May 12
Firefox desktop development meeting - 2026-05-12
Hello Firefox fans! Here are the details for todays's meeting: When: http://arewemeetingyet.com/
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Firefox desktop development meeting - 2026-05-12
Hello Firefox fans! Here are the details for todays's meeting: When: http://arewemeetingyet.com/
May 12
Donal Meehan
May 6
Weekly Firefox dot release schedule starting with Firefox 151
Hi everyone, We're planning a release process change to improve how quickly and predictably we
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Weekly Firefox dot release schedule starting with Firefox 151
Hi everyone, We're planning a release process change to improve how quickly and predictably we
May 6
Olivier (shtrom) Mehani
May 6
Lando can now show you your own queue of jobs
Hi all, A little heads up that we landed and deployed https://bugzilla.mozilla.org/show_bug.cgi?id=
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Lando can now show you your own queue of jobs
Hi all, A little heads up that we landed and deployed https://bugzilla.mozilla.org/show_bug.cgi?id=
May 6
Marcin Kozinski
Apr 30
Introducing kotlin-test to our codebase
Hi all, Today we landed our first ADR (Architectural Decision Record). It's about introducing a
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Introducing kotlin-test to our codebase
Hi all, Today we landed our first ADR (Architectural Decision Record). It's about introducing a
Apr 30
Katherine Patenio
Apr 30
Import-ant Updates - These Weeks in Firefox: Issue 201
Hello firefox-dev, We have another round of Firefox Desktop engineering updates to send out this week
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Import-ant Updates - These Weeks in Firefox: Issue 201
Hello firefox-dev, We have another round of Firefox Desktop engineering updates to send out this week
Apr 30
Mike Conley
Apr 28
Firefox desktop development meeting - 2026-04-28
Hello Firefox fans! Here are the details for today's meeting: When: http://arewemeetingyet.com/
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Firefox desktop development meeting - 2026-04-28
Hello Firefox fans! Here are the details for today's meeting: When: http://arewemeetingyet.com/
Apr 28
Niklas Baumgardner
Apr 27
VPN, Split View, and Other Goodies - These Weeks in Firefox: Issue 200!
Hello firefox-dev, The Firefox Desktop engineering team gathered a the other week to share the latest
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VPN, Split View, and Other Goodies - These Weeks in Firefox: Issue 200!
Hello firefox-dev, The Firefox Desktop engineering team gathered a the other week to share the latest
Apr 27
Florian Quèze
Apr 24
mochitest failures in CI are now retried within the same job
A recent patch (bug 2032038) changed how mochitest failures are handled in CI: - Failed mochitests
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mochitest failures in CI are now retried within the same job
A recent patch (bug 2032038) changed how mochitest failures are handled in CI: - Failed mochitests
Apr 24
Gregory Mierzwinski
Apr 22
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
Apr 22
Emilio Cobos Álvarez
, …
Dave Townsend
9
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
Frederik Braun
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
Mike Conley
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
