thunderbird

As we head into the summer months, a new Extended Support Release (ESR) is in full bloom. Thunderbird 153 "Meadow" is out now, and from all of us at MZLA, the Thunderbird Council, and our global community of contributors, we can't wait for you to try it out.

"Meadow" builds on Thunderbird 140 "Eclipse," along with the steady stream of features and improvements that have landed in the Monthly Release channel over the past year. This release makes first-time setup smoother with a redesigned Account Hub, brings native Microsoft Exchange support out into the open, and lets Thunderbird take on the colors of your desktop. Add privacy-minded networking, friendlier notifications, and a healthy crop of refinements, and Meadow is ready to grow with you.

Easier Account Creation

The all-new Account Hub makes setting up accounts faster and more intuitive than ever, with improved autodiscover, automatic protocol detection, and automatic setup of connected calendars and address books.

Address Book Setup

The new Account Hub modal lets you set up all types of local and remote address books. Existing email accounts are automatically scanned to detect available address books that haven't been configured yet.

Microsoft Exchange Support

We've added full support for Exchange email servers via Exchange Web Services: set up Microsoft Exchange accounts natively to read, manage, and write emails, no add-ons required. Experimental Microsoft Graph support is already in core but temporarily disabled behind a preference while we finish it, with full support plus Calendar and Address Book integration aimed for later this year.

Accent Colors

Meadow now inherits your operating system's accent color to match your preferred look. You can also customize your colors with the new accent color settings in the Appearance tab.

Do More From Your Notifications

Mark an email as read, delete it, flag it as spam, and more right from the native notifications on your operating system.

In addition to these headline features, there's a whole host of other updates you'll love, including:

OAuth in Browser

Thunderbird now supports OAuth authentication directly in your default browser.

Login With Thundermail

If you have a Thundermail account, you can sign in to Thunderbird with one-click authentication in the Account Hub.

Folder Sorting

Improvements An improved UI and better visual indicators make sorting your emails easier than ever.

Bug Fixes and Improvements

Thousands of bug fixes and performance improvements bring you the smooth, reliable Thunderbird experience you expect.

Looking Forward

Thunderbird 153 "Meadow" might seem soothing and calm, but we're excited to get these features into your hands. And if you'd like updates like these more often, there's no need to wait for the annual release: switching to Thunderbird Release gets you new updates on a monthly basis.

Thunderbird 153 Availability for Windows, Linux, and macOS

Even with QA and beta testing, any major software release may have issues that only surface after significant public use. That's why we're rolling out automatic updates gradually, enabling them more broadly as we confirm everything is stable.

Manual upgrade to 153 is now enabled via Help > About - you can upgrade now or wait to receive automatic updates. Thunderbird 153.0 is also offered as a direct download from thunderbird.net. Be sure to select 'Thunderbird Extended Support Release' in the 'Release Channel' drop-down menu.

For Linux users running Thunderbird from the Snap or Flatpak, 153 will be available within the next few weeks. Likewise, Thunderbird 153 will arrive on the Microsoft Store by mid-July.

Full r elease notes can be found he re.

If you have any issues, please reach out to support.

Have an idea? We want to hear it! Submit your ideas here.

The post Thunderbird 153 "Meadow" is out now! appeared first on The Thunderbird Blog.

22 Jul 2026 9:45pm GMT

The latest version of PerfCompare is now live!

Check out the change-log below to see the updates:

[kala-moz]

[moijes]

Bug 1986319: Auto-select for partial or full hash matches (#1066 )

[sumairq]

Bug-1855186 : Show whether lower or higher is "better" for each metric (#1051 )

Thank you for the contributions!

Bugs or feature requests can be filed on Bugzilla. The team can also be found on the #perfcompare channel on Element. Come and chat!

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22 Jul 2026 5:36pm GMT

Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tag us at @thisweekinrust.bsky.social on Bluesky or @ThisWeekinRust on mastodon.social, or send us a pull request. Want to get involved? We love contributions.

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Updates from Rust Community

Official

Announcing Rust 1.97.1

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The Embedded Rustacean Issue #76

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Crate of the Week

This week's crate is xan, a TUI toolkit to work with CSV files.

Thanks to Simeon H.K. Fitch for the suggestion!

Please submit your suggestions and votes for next week!

Calls for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization.

If you are a feature implementer and would like your RFC to appear in this list, add a call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

No calls for testing were issued this week by Rust, Cargo, Rustup or Rust language RFCs.

Let us know if you would like your feature to be tracked as a part of this list.

Call for Participation; projects and speakers

CFP - Projects

Always wanted to contribute to open-source projects but did not know where to start? Every week we highlight some tasks from the Rust community for you to pick and get started!

Some of these tasks may also have mentors available, visit the task page for more information.

No Calls for participation were submitted this week.

If you are a Rust project owner and are looking for contributors, please submit tasks here or through a PR to TWiR or by reaching out on Bluesky or Mastodon!

CFP - Events

Are you a new or experienced speaker looking for a place to share something cool? This section highlights events that are being planned and are accepting submissions to join their event as a speaker.

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If you are an event organizer hoping to expand the reach of your event, please submit a link to the website through a PR to TWiR or by reaching out on Bluesky or Mastodon!

Updates from the Rust Project

576 pull requests were merged in the last week

Compiler

Library

Cargo

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

The two most notable changes this week were #159115, which resulted in pretty nice instruction count wins for full incremental builds on several benchmarks, and #159091, which enabled PGO for rustdoc, which makes it ~3-4% faster across the board.

There were two large rollups with tiny performance regressions, which made it difficult to find the offending PRs.

Triage done by @Kobzol. Revision range: 5503df87..d527bc9b

Summary:

(instructions:u)	mean	range	count
Regressions ❌ (primary)	0.4%	[0.2%, 1.0%]	40
Regressions ❌ (secondary)	0.7%	[0.2%, 4.6%]	69
Improvements ✅ (primary)	-2.0%	[-6.2%, -0.2%]	136
Improvements ✅ (secondary)	-2.6%	[-8.4%, -0.2%]	119
All ❌✅ (primary)	-1.4%	[-6.2%, 1.0%]	176

2 Regressions, 3 Improvements, 6 Mixed; 4 of them in rollups 34 artifact comparisons made in total

Full report here.

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

No RFCs were approved this week.

Final Comment Period

Every week, the team announces the 'final comment period' for RFCs and key PRs which are reaching a decision. Express your opinions now.

Tracking Issues & PRs

Rust

Compiler Team (MCPs only)

Leadership Council

Deallocate post-2026 funds from PM and compiler-ops

Unsafe Code Guidelines

Do the bytes of a pointer have to stay in the same order?

No Items entered Final Comment Period this week for Cargo, Language Reference, Language Team or Rust RFCs.

Let us know if you would like your PRs, Tracking Issues or RFCs to be tracked as a part of this list.

New and Updated RFCs

RFC: Refactor the libs team

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