firefox-dev@mozilla.org

When you run a development version of Firefox with `./mach run` it runs with a temporary profile but

Until a couple days ago, when a test crashed, in the treeherder Failure Summary, you saw a line like:

Welcome to the Q3 2025 edition of the Firefox Security and Privacy newsletter! Security and Privacy

Hello everyone, We're back with another batch of Firefox engineering updates. Check them out

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

If you pushed changes for testing to Try between Friday 10:30pm UTC / 6:30pm EDT / 3:30pm PDT and

tl;dr: xpcshell tests now timeout by default in 30s instead of 5 minutes and you might need to add

Greetings Firefox fans, Our next Firefox Desktop meeting will start in about 40 minutes. You can find

The version bump to 146 has now landed on mozilla-central and the soft freeze period is over. Thanks,

Assuming things stick, the manifests for our built-in light / dark themes will be mostly empty as of

Welcome to the Q3 edition of the Engineering Effectiveness Newsletter! The Engineering Effectiveness

Hi all, Our friends at pernosco have worked with us to bring JavaScript support into their tools.

Hey Firefox friends! We're back with another round of highlights and improvements from across

Hello, With Firefox 145 in the Release Candidate phase this week, we are nearing the end of the

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

Happy Monday, Firefox team! Hope you had a restful weekend. We're kicking off the week with a

Hi Firefox friends, Hope this message finds you well! We've got another jam-packed roundup of

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

The version bump to 145 has now landed on mozilla-central and the soft freeze period is over. Thanks,

More of the latter. If you know the specific team to reach out to and how to get help, I'd say

Here are some screenshots of the form in Lando and the button to edit the form after submission. The

Hello Firefox fans! Getting this reminder out a bit early, since Monday is a holiday in the US and

Just to answer some questions I should have included in the original e-mail: 1. This only applies to

To make ChromeUtils.addProfilerMarker easier to use, I recently added a ChromeUtils.now method

After some fiddling with my build system it turned out that user_pref("termsofuse.

Hi Mike, Exciting! It looks like https://firefox-source-docs.mozilla.org/code-quality/coding-style/

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

The version bump to 144 has now landed on firefox-main (mozilla-central) and the soft freeze period

As I have been doing most of the work for CI upgrades, I would like to take the opportunity to share

Hey, hey Firefox fans! Here are the details for today's meeting: When: http://arewemeetingyet.com