fidzu : thunderbird

Bugs resolved in Moz-Phab 2.15.4:

• bug 2058150 moz-phab patch crashes with KeyError when a stack relative is not visible to the user

Discuss these changes in #engineering-workflow on Slack or #Conduit Matrix.

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27 Jul 2026 4:15pm GMT

This past May, we shared our vision for the future of Firefox. Starting today, you can try out the next design evolution of Firefox in Nightly.

It's still Firefox, now with a more cohesive look and feel across tabs, menus, panels, and other browser surfaces. You'll notice softer tab shapes, a warmer color palette, updated icons, and - after hearing from many of you - the return of Compact Mode and new theme options to make Firefox your own.

Many of you have already spotted pieces of the new design in Nightly over the past few months. Now they're coming together into one complete experience.

You'll continue to see updates over the coming weeks as we polish the new Firefox design before it reaches Firefox users more broadly later this year. As you browse, we're especially interested in any visual or functional issues you encounter.

Keep an eye out for things like:

• Icons, spacing, and alignment
• Themes and personalization
• Different window sizes and display scaling
• Keyboard navigation
• Screen readers and other accessibility features
• Different languages and layouts

Found a bug?

If something doesn't look or behave as expected, please file a bug in Bugzilla.

When possible, include:

• Steps to reproduce the issue
• Screenshots or screen recordings
• Your operating system and Nightly version

If you have broader thoughts or questions about your experience, join the discussion on Mozilla Connect.

Thanks for using Nightly and helping us improve Firefox. Every bug report helps us identify issues and continue refining the new Firefox design before it reaches Firefox users more broadly later this year.

27 Jul 2026 3:00pm GMT

The following changes have been pushed to bugzilla.mozilla.org:

Github Link

• Bug 2055236 - The column headers in Github PR are barely visible in dark mode
• Bug 2054574 - Do not auto-assigning Hackbot when submitting a Phabricator revision

Github Link

The following changes have been pushed to bugzilla.mozilla.org:

• Bug 2055285 - Remove the "Show closed/merged PR" checkbox in the GH PR view

Discuss these changes in the BMO Matrix Room

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23 Jul 2026 10:34pm GMT