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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

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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

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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

Bored Videos, Mike Conley2

12/19/25

Accessing the news articles

Hi Bored Videos, The Recommended Stories are served from Merino: https://github.com/mozilla-services/

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Accessing the news articles

Hi Bored Videos, The Recommended Stories are served from Merino: https://github.com/mozilla-services/

12/19/25

Jared Lockhart, Bored Videos2

12/19/25

Nimbus + AI Post Mortem

Can you give everyone read access? On Monday, December 15, 2025 at 4:43:51 PM UTC-6 Jared Lockhart

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Nimbus + AI Post Mortem

Can you give everyone read access? On Monday, December 15, 2025 at 4:43:51 PM UTC-6 Jared Lockhart

12/19/25

Andrew McCreight

12/18/25

New serializer for child-to-parent JS actor messages

# Introduction As part of my long-running project to enable type checking of child-to-parent JS actor

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New serializer for child-to-parent JS actor messages

# Introduction As part of my long-running project to enable type checking of child-to-parent JS actor

12/18/25

Ryan VanderMeulen2

12/8/25

Soft code freeze for Firefox 147 starts on Thursday, December 4 @ 8am UTC

The version bump to 148 has now landed on firefox-main and the soft freeze period is over. Thank you,

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Soft code freeze for Firefox 147 starts on Thursday, December 4 @ 8am UTC

The version bump to 148 has now landed on firefox-main and the soft freeze period is over. Thank you,

12/8/25

12/4/25

PerfCompare Statistics Project Update

Hello everyone, Perftools has successfully completed the first part of the PerfCompare Statistics

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PerfCompare Statistics Project Update

Hello everyone, Perftools has successfully completed the first part of the PerfCompare Statistics

12/4/25

12/2/25

Happy BMO Push Day! (20251202.1)

the following changes have been pushed to bugzilla.mozilla.org: (tag: https://github.com/mozilla-

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Happy BMO Push Day! (20251202.1)

the following changes have been pushed to bugzilla.mozilla.org: (tag: https://github.com/mozilla-

12/2/25

12/2/25

Firefox Security Advisory Survey

Hello, We have recently proposed a reduction in the scope of Firefox security advisories through the

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Firefox Security Advisory Survey

Hello, We have recently proposed a reduction in the scope of Firefox security advisories through the

12/2/25

11/24/25

Getting Better Every Day - These Weeks in Firefox: Issue 192

Hello firefox-dev, A few weeks back, the Firefox Desktop engineering teams got together to share the

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Getting Better Every Day - These Weeks in Firefox: Issue 192

Hello firefox-dev, A few weeks back, the Firefox Desktop engineering teams got together to share the

11/24/25

11/20/25

HTTPS servers for xpcshell-tests

Hi folks, I would like to announce that we recently moved NodeServer classes from head_servers.js

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HTTPS servers for xpcshell-tests

Hi folks, I would like to announce that we recently moved NodeServer classes from head_servers.js

11/20/25

11/10/25

Firefox desktop development meeting - 2025-11-11 - **CANCELLED**

Hi folks. Since America, Canada, France and possibly other countries are off for Armistice Day/

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Firefox desktop development meeting - 2025-11-11 - **CANCELLED**

Hi folks. Since America, Canada, France and possibly other countries are off for Armistice Day/

11/10/25

11/10/25

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,

11/10/25

11/6/25

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

11/6/25

Gregory Mierzwinski

11/4/25

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/

11/4/25

10/31/25

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

10/31/25

10/29/25

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:

10/29/25

10/28/25

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

10/28/25

Katherine Patenio

10/27/25

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

10/27/25

10/27/25

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

10/27/25

Sebastian Hengst

10/26/25

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

10/26/25

10/24/25

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

10/24/25

Katherine Patenio

10/14/25

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

10/14/25

Pascal Chevrel2

10/13/25

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,

10/13/25

Emilio Cobos Álvarez

10/8/25

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

10/8/25

Marco Castelluccio

10/7/25

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

10/7/25

10/7/25

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.

10/7/25

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