13 May 2026

feedPlanet Mozilla

Firefox Tooling Announcements: MozPhab 2.15.1 Released

Bugs resolved in Moz-Phab 2.15.1:

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

1 post - 1 participant

Read full topic

13 May 2026 8:14pm GMT

This Week In Rust: This Week in Rust 651

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.

This Week in Rust is openly developed on GitHub and archives can be viewed at this-week-in-rust.org. If you find any errors in this week's issue, please submit a PR.

Want TWIR in your inbox? Subscribe here.

Updates from Rust Community

Foundation
Newsletters
Project/Tooling Updates
Observations/Thoughts
Rust Walkthroughs
Miscellaneous

Crate of the Week

This week's crate is cloakrs, a library and CLI tool for detecting and masking personally identifiable information.

Despite having no suggestion to work with, llogiq is content with his choice.

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.

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

502 pull requests were merged in the last week

Compiler
Library
Cargo
Clippy
Rust-Analyzer
Rust Compiler Performance Triage

This week saw a couple of PRs affecting the new trait solver, which is steadily moving forward, in particular #156139 was a massive perf. win. #156185 optimized visibility computation, resulting in up to a 8% win on the typenum crate.

Triage done by @Kobzol. Revision range: 1d72d7e8..aa31d6d8

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.3% [0.1%, 0.4%] 62
Regressions ❌
(secondary)		 0.5% [0.1%, 1.5%] 77
Improvements ✅
(primary)		 -1.7% [-8.8%, -0.2%] 18
Improvements ✅
(secondary)		 -13.6% [-85.6%, -0.0%] 34
All ❌✅ (primary) -0.2% [-8.8%, 0.4%] 80

2 Regressions, 2 Improvements, 5 Mixed; 4 of them in rollups 31 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:

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

Rust RFCs

Language Reference

Leadership Council

No Items entered Final Comment Period this week for Cargo, Compiler Team (MCPs only), Language Team or Unsafe Code Guidelines. 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

Upcoming Events

Rusty Events between 2026-05-13 - 2026-06-10 🦀

Virtual
Asia
Europe
North America
Oceania
South America

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

Of the last 150 merged PRs to Bun, 108 are memory-safety-adjacent - missed cleanup on an error path, use-after-free, uninitialized reads, out-of-bounds access, reentrancy. 75 of those would not compile in a language with destructors, move semantics, and a borrow checker. One in three PRs we ship is "forgot to free something on an error path."

Of the 108, ~88 are in Zig. The ~14 in C++ are mostly ref-cycles and GC-concurrency races - the residual class that survives any language. So the Zig→Rust delta is real: the Zig bugs are exactly the destructor/ownership-fixable kind, and the C++ side is already near the floor.

Without stronger compile-time guarantees, this stays a cat-and-mouse game. The proposal is to remove the largest bug class structurally rather than fix instances of it indefinitely.

- Jarred Sumner on the bun github

Thanks to Brian Kung for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by:

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

13 May 2026 4:00am GMT

11 May 2026

feedPlanet Mozilla

Mozilla Privacy Blog: Six Million Selections Later: How the DMA Is Giving People Browser Choice

At Mozilla, we've long believed in giving people choice and agency over their experiences online. As power in digital markets has concentrated in a small number of large companies, there have been efforts in the US, Japan, UK, India, Korea, Brazil and elsewhere to restore competition and put choice back in people's hands.

These efforts are at various stages, but first among them was the EU's Digital Markets Act. Over two years since obligations came into effect, the DMA is delivering for people in some key areas.

Not everywhere. Not perfectly. And not without enforcement. But browser choice is the clearest example.

Every 10 seconds, someone picks Firefox through a DMA choice screen

Operating systems like iOS, Android, Windows, and MacOS lean on pre-installed browsers, tricky default settings, and deceptive design to make it hard for people to exercise choice and to keep independent browsers from competing on a level playing field. But where the DMA has created opportunities for genuine browser choice, people are taking it.

New Mozilla data is clear: since the rules took effect, Firefox is selected through a DMA browser choice screen every 10 seconds. That adds up to more than six million Firefox selections. And people are sticking with us: retention is five times higher when people choose Firefox through a choice screen.

Academic analysis points the same way. Independent researchers compared Firefox daily active users in the EU with 43 non-EU countries. Comparing the 15 months before and after browser choice screens rolled out on iOS, they found that Firefox daily active users (DAU) were 113% higher in the EU than it would have been without the DMA. On Android, it was 12% higher. The smaller Android effect is due to the fact that Firefox usage there started from a much higher base, and the Android rollout has been more uneven than on iOS. The research also shows that the DMA's effect is growing over time.

Browser choice on mobile is moving, but desktop is left behind

The DMA's work isn't done. There remains room for improvement on mobile (including making it easier to import your data to a new browser and switch with one click). However, desktop remains largely untouched - leaving roughly 310 million desktops and laptops in the EU without equivalent browser choice. For example, Windows users are subject to deceptive design tactics and are not given an active choice. Even where choice screens exist, they are not a silver bullet; ecosystem lock-in and interoperability barriers still hold back competition and innovation.

Still, the signal is clear: when people get real browser choice, they take it and select alternatives. It's easy for gatekeepers to dismiss this as a couple of competitors benefiting. This ignores the range of challenger browsers also reporting huge growth in the EU. What's more, it ignores the benefit to people. DMA browser choice screens are reaching different audiences. Mozilla analysis shows that women make up a significantly higher share of Firefox selections on iOS via a choice screen than organic downloads, suggesting that choice screens may successfully reach a demographic that reports lower confidence in manually changing browser defaults. The DMA's effects are only starting to be felt and understood.

The road ahead

Effective enforcement of the obligations is the way forward. Gatekeepers continue to test and, in many instances, openly push back against the intent of the DMA provisions. This can take the form of implementation choices that limit real user uptake, delays in rolling out effective solutions, or sustained efforts to reinterpret, weaken, or roll back key provisions.

Most evidently, privacy and security arguments are often elevated in ways that risk diverting attention from whether compliance is delivering genuine choice and competition in practice. In reality, privacy, security, and effective competition can and should be designed to work hand-in-hand. They do not always have to be traded off.

Policymakers and enforcers should remain focused on outcomes: ensuring that the DMA delivers real-world competition and user choice, and resisting efforts to dilute its impact through partial compliance or narrative reframing.

Browser choice is just the start

Mozilla's hope is that real browser choice will become the rule, rather than the exception. And that the lessons of browser choice screens will be applied to other areas of the DMA, including data portability and interoperability. Only with full compliance - including applying the existing DMA text to AI - can the full benefits of competition and innovation be brought to people in the EU.

The post Six Million Selections Later: How the DMA Is Giving People Browser Choice appeared first on Open Policy & Advocacy.

11 May 2026 7:03pm GMT