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Dave Townsend
3:59 AM
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
3:59 AM
Florian Quèze
Oct 29
Crashes happening during tests just became easier to look at
Until a couple days ago, when a test crashed, in the treeherder Failure Summary, you saw a line like:
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Crashes happening during tests just became easier to look at
Until a couple days ago, when a test crashed, in the treeherder Failure Summary, you saw a line like:
Oct 29
Frederik Braun
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
Katherine Patenio
Oct 27
Extensions UI Improvements and More - These Weeks in Firefox: Issue 191
Hello everyone, We're back with another batch of Firefox engineering updates. Check them out
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Extensions UI Improvements and More - These Weeks in Firefox: Issue 191
Hello everyone, We're back with another batch of Firefox engineering updates. Check them out
Oct 27
Jared Wein
Oct 27
Firefox desktop development meeting - 2025-10-27
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
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Firefox desktop development meeting - 2025-10-27
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
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
Florian Quèze
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
Katherine Patenio
Oct 14
Firefox desktop development meeting - 2025-10-14
Greetings Firefox fans, Our next Firefox Desktop meeting will start in about 40 minutes. You can find
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Firefox desktop development meeting - 2025-10-14
Greetings Firefox fans, Our next Firefox Desktop meeting will start in about 40 minutes. You can find
Oct 14
Pascal Chevrel
2
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
Emilio Cobos Álvarez
Oct 8
PSA: Built-in Light / Dark theme set-up change
Assuming things stick, the manifests for our built-in light / dark themes will be mostly empty as of
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PSA: Built-in Light / Dark theme set-up change
Assuming things stick, the manifests for our built-in light / dark themes will be mostly empty as of
Oct 8
Marco Castelluccio
Oct 7
Engineering Effectiveness Newsletter (Q3 2025 Edition)
Welcome to the Q3 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness
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Engineering Effectiveness Newsletter (Q3 2025 Edition)
Welcome to the Q3 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness
Oct 7
Frederik Braun
Oct 7
You can now test JavaScript debugging with Pernosco
Hi all, Our friends at pernosco have worked with us to bring JavaScript support into their tools.
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You can now test JavaScript debugging with Pernosco
Hi all, Our friends at pernosco have worked with us to bring JavaScript support into their tools.
Oct 7
Anna Kulyk
Oct 6
Smarter Search, Smoother Tools - These Weeks in Firefox: Issue 190
Hey Firefox friends! We're back with another round of highlights and improvements from across
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Smarter Search, Smoother Tools - These Weeks in Firefox: Issue 190
Hey Firefox friends! We're back with another round of highlights and improvements from across
Oct 6
Pascal Chevrel
Oct 6
Soft code freeze for Firefox 146 starts on Thursday, October 9 @ 8am UTC
Hello, With Firefox 145 in the Release Candidate phase this week, we are nearing the end of the
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Soft code freeze for Firefox 146 starts on Thursday, October 9 @ 8am UTC
Hello, With Firefox 145 in the Release Candidate phase this week, we are nearing the end of the
Oct 6
Jared Hirsch
Sep 29
Firefox desktop development meeting - 2025-09-30
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
unread,
Firefox desktop development meeting - 2025-09-30
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
Sep 29
Anna Kulyk
Sep 22
Firefox 144 Highlights: Faster Add-ons, Smarter DevTools, and Tab Group Boosts - These Weeks in Firefox, Issue 189
Happy Monday, Firefox team! Hope you had a restful weekend. We're kicking off the week with a
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Firefox 144 Highlights: Faster Add-ons, Smarter DevTools, and Tab Group Boosts - These Weeks in Firefox, Issue 189
Happy Monday, Firefox team! Hope you had a restful weekend. We're kicking off the week with a
Sep 22
Anna Kulyk
Sep 19
Add-ons, Fixes, and DevTools Snacks - These Weeks in Firefox: Issue 188
Hi Firefox friends, Hope this message finds you well! We've got another jam-packed roundup of
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Add-ons, Fixes, and DevTools Snacks - These Weeks in Firefox: Issue 188
Hi Firefox friends, Hope this message finds you well! We've got another jam-packed roundup of
Sep 19
Hanna Jones
Sep 15
Firefox desktop development meeting - 2025-09-15
Hey Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com/
unread,
Firefox desktop development meeting - 2025-09-15
Hey Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com/
Sep 15
Donal Meehan
2
Sep 15
Soft code freeze for Firefox 144 starts on September 11 @ 8am UTC
The version bump to 145 has now landed on mozilla-central and the soft freeze period is over. Thanks,
unread,
Soft code freeze for Firefox 144 starts on September 11 @ 8am UTC
The version bump to 145 has now landed on mozilla-central and the soft freeze period is over. Thanks,
Sep 15
Andrew Halberstadt
,
Erich Gubler
4
Sep 11
Introducing #dev-help on Matrix
More of the latter. If you know the specific team to reach out to and how to get help, I'd say
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Introducing #dev-help on Matrix
More of the latter. If you know the specific team to reach out to and how to get help, I'd say
Sep 11
Connor Sheehan
2
Sep 9
PSA: the uplift request assessment form is now in Lando
Here are some screenshots of the form in Lando and the button to edit the form after submission. The
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PSA: the uplift request assessment form is now in Lando
Here are some screenshots of the form in Lando and the button to edit the form after submission. The
Sep 9
Mike Conley
Aug 29
Firefox desktop development meeting - 2025-09-02
Hello Firefox fans! Getting this reminder out a bit early, since Monday is a holiday in the US and
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Firefox desktop development meeting - 2025-09-02
Hello Firefox fans! Getting this reminder out a bit early, since Monday is a holiday in the US and
Aug 29
Andrew Halberstadt
2
Aug 27
PSA: Deprioritizing excessively large try pushes
Just to answer some questions I should have included in the original e-mail: 1. This only applies to
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PSA: Deprioritizing excessively large try pushes
Just to answer some questions I should have included in the original e-mail: 1. This only applies to
Aug 27
Florian Quèze
Aug 27
Please use ChromeUtils.now instead of Cu.now
To make ChromeUtils.addProfilerMarker easier to use, I recently added a ChromeUtils.now method
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Please use ChromeUtils.now instead of Cu.now
To make ChromeUtils.addProfilerMarker easier to use, I recently added a ChromeUtils.now method
Aug 27
L Hombre
,
Julian Descottes
4
Aug 26
Get rid of the new Welcome Page for QA testing (since v 142.0)
After some fiddling with my build system it turned out that user_pref("termsofuse.
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Get rid of the new Welcome Page for QA testing (since v 142.0)
After some fiddling with my build system it turned out that user_pref("termsofuse.
Aug 26
Mike Hommey
,
Daniel Holbert
2
Aug 20
Minimum supported versions of GCC and Clang changed
Hi Mike, Exciting! It looks like https://firefox-source-docs.mozilla.org/code-quality/coding-style/
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Minimum supported versions of GCC and Clang changed
Hi Mike, Exciting! It looks like https://firefox-source-docs.mozilla.org/code-quality/coding-style/
Aug 20
Mark Striemer
Aug 18
Firefox desktop development meeting - 2025-08-19
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
unread,
Firefox desktop development meeting - 2025-08-19
Hello Firefox fans! Here are the details for tomorrow's meeting: When: http://arewemeetingyet.com
Aug 18
Ryan VanderMeulen
2
Aug 18
Soft code freeze for Firefox 143 starts on August 14 @ 8am UTC
The version bump to 144 has now landed on firefox-main (mozilla-central) and the soft freeze period
unread,
Soft code freeze for Firefox 143 starts on August 14 @ 8am UTC
The version bump to 144 has now landed on firefox-main (mozilla-central) and the soft freeze period
Aug 18
Joel Maher
Aug 5
Updated policy for adjust CI test platforms and related manifest conditions
As I have been doing most of the work for CI upgrades, I would like to take the opportunity to share
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Updated policy for adjust CI test platforms and related manifest conditions
As I have been doing most of the work for CI upgrades, I would like to take the opportunity to share
Aug 5
Maxx Crawford
Aug 5
Firefox desktop development meeting - 2025-08-05
Hey, hey Firefox fans! Here are the details for today's meeting: When: http://arewemeetingyet.com
unread,
Firefox desktop development meeting - 2025-08-05
Hey, hey Firefox fans! Here are the details for today's meeting: When: http://arewemeetingyet.com
Aug 5