fidzu : thunderbird

Please note some of the information provided in this report may be subject to change as we are sometimes sharing information about projects that are still in early stages and are not final yet.

Welcome!

Are you a locale leader and want us to include new members in our upcoming reports? Contact us!

Changes to the localization team

A lot has changed in the team this year. Delphine and Peiying left Mozilla a few months ago, and we're now happy to welcome three new members:

• Camila (parker) will focus on our mobile projects (Android and iOS), while also helping with Spanish localization.
• Eda (edie) will focus on our web projects (mozilla.org, firefox.com, AMO, etc.), while also helping with Turkish localization.
• Eric (ewerybody) will work alongside Eemeli and Matjaž to support and improve our localization infrastructure, including the moz-l10n library that powers several features in Pontoon.

For both Camila and Eda, contributing directly in Pontoon will also be an important part of getting to know our localization community. By working as localizers themselves, they'll experience firsthand the challenges contributors encounter and gain a better understanding of how our communities organize and work together.

In the coming months, we'll publish a series of blog posts to introduce our new team members - and reintroduce some familiar faces, since it's either been a while or we never got around to introducing them when they joined.

What's new or coming up in Firefox desktop

Firefox 155 Beta

Today marks the beginning of the Beta cycle for Firefox 155 and the start of the shift to Firefox's 2-week release cycle. You can find more information on this change and how it affects you in our update here: Firefox Release Changes and Localization.

Themes

A new part of the upcoming Firefox redesign is a number of built-in themes a user can select for their profile. The theme-picker.ftl strings are landing in Firefox 155 and include a number of theme names which are short, evocative names in English. We have generated a reference document to help with creating localized names in your languages, it includes both testing instructions and screenshots.

What's new or coming up in SUMO

We would love more helping hands to bring the following locales across the finish line:

• Spanish - 48% remaining
• Japanese - 19% remaining
• Portuguese (Brazil) - 11% remaining
• Portuguese (Portugal) - 17% remaining

If you're a contributor in one of these locales, now is a great time to jump in. Every translated string brings us one step closer to shipping a better experience for users around the world!

What's new or coming up in Pontoon

Editor theme. The translation editor can now follow your theme choice. You can set the editor theme independently of the main interface - Light, Dark, or Main to match the rest of Pontoon. The change comes from Ayush (ayshushus), who is interning with the L10n team and wrote about the work on this blog back in July.

Copy from another locale. A new batch action lets you copy translations from another locale into the strings you've selected. It's especially handy for closely related languages, or for locales that share terminology and want to bootstrap from an existing translation as a starting point. The feature was contributed by Serah (MundiaNderi), a volunteer contributor who wrote about her work on Pontoon earlier this year.

Community health. Teams can now follow their Community Health Score over time in a new chart on the team Insights tab, alongside the existing activity charts. The L10n team also gets a cross‑locale overview to spot communities that may need support. The dashboard was built by Jamie (functionzz), who is interning with the L10n team. See his previous blog post on translation search unification.

Composed Machinery suggestions. Fluent messages with attributes or selectors used to require copying each field separately, one match at a time. Machinery now offers a single suggestion that covers the entire message: every field is filled from a perfect translation memory match, falling back to machine translation, and one click copies all of them into the editor at once.

Automatic LLM suggestions. Until now, getting an LLM suggestion meant opening the AI menu on a machine translation result and picking an option. The suggestion is now generated automatically and shown as its own entry in the Machinery panel. We're starting with a limited rollout - signed‑in users, strings without an approved translation, and a small set of locales - so we can evaluate quality and cost before expanding. The AI menu keeps working as before, in every locale.

Other improvements. A number of more focused changes also landed, thanks to our contributors:

• Notifications about new strings now link only to the strings that were actually added, instead of the full resource - by flodolo (#4185).
• A year selector was added to the chart on profile pages - by flodolo (#4205).
• The list of translations on a Search page is now more compact and easier to scan - by functionzz (#4157).
• Search boxes now look and behave consistently across the entire app - by MundiaNderi (#4301).
• A clear "String not found" page is now shown when the active filters don't match the string you're opening - by ayshushus (#4281).
• Profile images from Mozilla accounts are now supported - by wassafshahzad (#4215).
• String counts in the translate interface are now formatted using your locale's own conventions instead of a hardcoded en‑GB - by ewerybody (#4127).

New contributors. We're happy to welcome another group of contributors who made their first patches to Pontoon in the past few months: Kasturijadhav14 (6 patches), eshu3104 (2), jbuck, troypsierrallc-dot, msranjana, and denyshon. Their work spans notifications, contributor profiles, documentation, UI polish, the API, and infrastructure - thank you all!

Friends of the Lion

Know someone in your l10n community who's been doing a great job and should appear here? Contact us and we'll make sure they get a shout-out!

Useful Links

• #l10n-community channel on Element (chat.mozilla.org)
• Localization category on Discourse
• Mastodon
• L10n blog

Questions? Want to get involved?

If you want to get involved, or have any question about l10n, reach out to:

• Bryan - Project Manager (Firefox, Mozilla Accounts)
• Camila - Project Manager (Firefox for Android, Firefox for iOS)
• Eda - Project Manager (Web projects)
• Francesco (flod) - Project Manager, L10n Team Manager
• Francis - Project Manager (Common Voice, Mozilla Foundation)
• Théo - Project Manager (Mozilla Foundation)
• Kiki - Project Manager (SUMO)
• Eemeli - Developer (Pontoon, Infrastructure)
• Eric - Developer (Pontoon, Infrastructure)
• Matjaž (mathjazz) - Developer (Pontoon)

Did you enjoy reading this report? Let us know how we can improve it.

13 Aug 2026 8:38pm GMT

We have tokens that are added to official builds when a CI server is building the production-ready application. These tokens are added to the BuildConfig.java by using the [buildConfigField]1 function in a build.gradle.

While testing, you want to quickly regenerate just this file to see changes occur with a new value. Instead of using the more expensive assembleDebug task for your debug variant, you can use generateDebugBuildConfig.

In the Firefox monorepo world for the Fenix module, the fully-qualified task name would look like this:

./mach gradle :fenix:generateDebugBuildConfig

13 Aug 2026 12:00am 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.

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

Official

• Call for testing: Restricting trait implementability and field mutability

Foundation

• Rust Team Health Summit: September 8 in Montréal
• Catching Up with the Rust Content Team: RustWeek Interviews and a New Changelog Series

Newsletters

• This Month in Rust OSDev: July 2026

Project/Tooling Updates

We are making changes to the Project/Tooling Updates Section - see here for more details

• Bevy's Sixth Birthday
• fearless_simd v0.7: 64-bit integers, improved generics, SSE2, and upcoming v1.0
• vairedb 0.1.0 - Cloud Native Distributed Analytical Database
• OXVG 0.0.7: introducing an SVG-to-JSX transformer to the OXVG toolchain
• HTML, JavaScript, CSS should have died long ago
• Even more formal verification for BPF
• kache 0.14.0: debuggable restores and cross-clone convergence
• kobe 0.39.0: hardening the cluster-lease lifecycle
• renew 0.1.1: a deterministic, code-first game engine
• GRIT 1.1: type-check your quantized tensors
• floDl: Introducing AMD GPU support
• git-cache-proxy: read-only cache for git

Observations/Thoughts

• A Vision for Cargo
• Cylic trait implementations: motivation
• Rust SIMD on the GPU
• Rewriting in Rust: Performance, Failures, 2026 Reality Check
• RangeFrom, Part 1..: History and background
• Typed Conversations: Make Illegal Agent Dialogues Unrepresentable
• ECQV: implicit certificates, and why I kept them out of the project that motivated them
• TLS Handshakes: Measuring the Performance of 4 Cryptography Libraries
• Building scalable backend services with Rust and PostgreSQL
• PoC for universal hardware-in-the-loop HAL test suite - Tweede golf
• [video] FLOSS 878 - A Tool With Opinions

Rust Walkthroughs

• Downcasting Arcs in Rust
• Profiling Rust with hotpath-rs: The Complete Guide - From SQL Queries to CPU Sampling
• A chip-agnostic architecture for bare-metal embedded Rust

Research

• Rust Coreutils: Rebuilding Unix Foundations in a Modern Language

Miscellaneous

Crate of the Week

This week's crate is literator, a crate for efficiently displaying the items of an iterator without temporary allocations.

Thanks to Nora 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.

• Diesel - Improve the documentation of our derives

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

698 pull requests were merged in the last week

Compiler

• check the fallback map before queueing child in visible_parent_map breadth-first search
• enable polonius alpha on nightly
• improve canonical_param_env_cache
• interpret: skip deref-projection validity checks when they are not needed
• optimize crate resolution for large workspace
• optimize handling of solver errors
• optimize try_evaluate_obligations
• perf: cache already-checked types in the privacy visitor
• perf: lock-free root fast paths for hygiene queries
• perf: skip irrelevant foreign impls when building the specialization graph
• perf: store the fulfillment engine inline in ObligationCtxt
• shallow resolve ty and const vars to their root vars, attempt 2
• speed up EverInitializedPlaces
• split apply_primary_terminator_effect
• stabilize c_variadic_naked_functions

Library

• add fast path to escape_string_symbol
• core: generalize BorrowedCursor::ensure_init
• hint that memchr returns an in-bounds index
• implement <OnceCell,OnceLock>::new_init
• implement to_string() on ByteStr and ByteString
• introduce a PinSafePointer trait that generalizes PinCoerceUnsized
• mark const ptr methods and free functions as inline(always) to match *mut
• optimize slice::contains for one-byte BytewiseEq types
• single-pass ASCII lower/upper case conversion
• stabilize fs_set_times

Cargo

• docs(changelog): Pull the --verbose item
• docs(ref): Add missing config env variables
• feat(log): emit build-started JSON message with run_id
• feat(profile): Add built-in profile debug
• feat(resolver): Report the min-publish-age in the lock message
• feat(toml): allow overriding inherited default-features in 2024
• feat(trim-paths): emit unremap files for final artifacts
• fix(clean): respect target with --doc
• fix(diag): Ensure diagnostic titles work without snippets
• fix(diag): Gate blanket_hint_mostly_unused with -Zprofile-hint-mostly-unused
• fix(diag): Remove complexity, perf, and nursery lint groups
• fix(git): Avoid use of git's core.fsmonitor
• fix(lock): Use more accurate 'highest, rather than 'latest'
• fix(resolver): Make min-publish-age relative to --publish-time
• fix(trim-paths): /cargo/deps fallback sources
• fix(trim-paths): workspace remap under -Zroot-dir
• refactor(resolver): resolve() does not need an optional gctx
• revert(compiler): forward verbose flag to rustc for local crates
• test(trim-paths): exercise unremap files with debuggers
• doc: don't use mergeable info and json together
• fix funding link
• refactor: remove unnecessary mut in sources
• test: handle non-deterministic compilation order

Rustdoc

• Create output file after we checked that the standalone markdown file is valid
• Do not take doc(cfg()) into account when filtering doctests

Clippy

• cast_possible_truncation: fix try_from suggestion expanding macros
• don't lint semicolon_if_nothing_returned in #[automatically_derived] …
• fix needless_range_loop suggests wrongly for nested index
• needless_bool: lint the early-return guard form
• new lint: nonzero operators and methods
• redundant_pattern_matching: parenthesize guarded matches! suggestion
• unwrap_or_default: respect MSRV for raw-pointer Default impls

Rust-Analyzer

• account for trailing line continuations in byte strings
• support #[rustc_must_implement_one_of] in the assists
• add replace_arith_with_strict assist
• term_search exclude useless target type
• add parens on some common cases for type_mismatch
• allow struct literals in match guards inside let exprs
• always allocate anon consts for c-strings/byte-strings literals
• avoid array len type mismatch with string panic
• avoid escaping bound vars produced by infer_method_call's skip_binder
• bound macro expansion depth across body and block boundaries
• do not consider locals of async fn as upvars of the returned coroutine
• do not declare the value NS constructor for structs/enum variants if it does not exist
• don't panic when a lifetime is passed to an ident metavariable
• fix 'no entry found for key' panic in VFS
• fix upvars query of const block inside closure
• fixed positive diagnostic for valid code
• initialize macro_depth to the file's macro depth in docs.rs and assoc.rs
• let Param::parent_fn return function for BuiltinDeriveImplMethod methods
• normalize associated types in orphan checks
• off-by-one in lifetime binders when lowering dyn Trait<'a>
• optimize memory usage of the item tree
• parse inline asm with keyword as operand name
• parse or pattern after range pattern
• preserve trailing text when InsertReplaceEdit is unsupported
• remove extra spaces in full function signatures
• support macros in #[doc] attributes in IDE features
• unresolved type variables shouldn't escape impl selection
• when searching for a pub macro, consider it available to reverse dependencies

Rust Compiler Performance Triage

This week so many new performance improvements landed that we needed to roll 10 of them up together to keep the bors queue manageable, great work! Also new is the LLVM 23 update which caused massive compile-time, run-time, bootstrap time and artifact size improvements. These improvements are reduced by the merge of Polonius Alpha on nightly causing a 3.0% regression. There still seems to be some potential to mitigate this regression.

Triage done by @JonathanBrouwer. Revision range: 65dd30fb..771916f9

Summary:

(instructions:u)	mean	range	count
Regressions ❌ (primary)	4.6%	[0.2%, 12.8%]	24
Regressions ❌ (secondary)	4.3%	[0.2%, 14.3%]	30
Improvements ✅ (primary)	-3.3%	[-16.4%, -0.2%]	251
Improvements ✅ (secondary)	-5.2%	[-34.8%, -0.2%]	308
All ❌✅ (primary)	-2.6%	[-16.4%, 12.8%]	275

1 Regression, 4 Improvements, 7 Mixed; 5 of them in rollups 25 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:

• Cargo: hints.min-opt-level
• Add extern "custom"

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

• std: map ENOTSUP to ErrorKind::Unsupported- #158580
• feat: add symmetric PartialEq impls for Vec, &[T], &mut [T] versus Cow<'_, [T]>
• Add Default implementation for std::sync::Once
• Extend dropping_{references,copy_types} lints to drop_in_place
• lint on more incorrect usages of core::ffi::c_void
• target_features: sse (or at least avx2) is incompatible with soft-float ABI
• Make let-else respect macro_rules expr metavariable grouping
• PowerPC inline ASM: Fix scalar floats being in the wrong vector lane on little endian
• stabilize Box::take
• make closures act like MaybeDangling
• enable next solver by default in orphanck
• Error on projection of dyn noncompat type in old trait solver
• Stabilize -Zprofile-sample-use

Compiler Team (MCPs only)

• Stop using dlltool for generating import libraries on MinGW
• Promote riscv64a23-unknown-linux-gnu to Tier 2 with host tools
• Drop tier 2 i686-pc-windows-gnu host tools

Leadership Council

• Allocate more funds for the Funding team in 2026
• Allocate more funds to 2026 travel budget

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

• RFC: Support External Linkers

Upcoming Events

Rusty Events between 2026-08-12 - 2026-09-09 🦀

Virtual

• 2026-08-13 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-13 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-08-14 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-16 | Virtual (Bangalore, IN) | Embedded Rust
  • Silicon Sundays #2
• 2026-08-18 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-08-19 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-20 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Tock OS Part #5 - Wireless Communication with the IEEE 802.15.4 protocol
• 2026-08-21 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-25 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2026-08-27 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-28 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-31 | Virtual (Global) | Rust Maven
  • Workshop: Add tests to an open source Rust project
• 2026-09-01 | Virtual (Global) | Rust Maven
  • Tauri: Cross-Platform desktop applications with Rust and web technologies
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-04 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-08 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-09-08 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up

Africa

• 2026-09-08 | Johannesburg, ZA | Johannesburg Rust Meetup
  • Rust's extended standard library

Asia

• 2026-08-22 | Bangalore, IN | Rust Bangalore
  • August 2026 Rustacean Meetup
• 2026-08-22 | Delhi, IN | Rust Delhi
  • Rust Delhi X SciPy India Meetup
• 2026-08-22 | Noida, IN | SciPy India
  • Scientific Computing in Rust and Python
• 2026-08-29 | Pune, IN | Rust Pune
  • Rust Pune Meetup: August 2026

Europe

• 2026-08-13 | Switzerland, CH | PostTenebrasLab
  • Rust Meetup Geneva
• 2026-08-18 | Aarhus, DK | Rust Aarhus
  • Hack Night: Trust but verify the LLM
• 2026-08-18 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Topic TBD
• 2026-08-20 | Frankfurt, DE | Rust Rhein-Main
  • Building an acoustic camera with egui and embassy
• 2026-08-27 | Manchester, UK | Rust Manchester
  • Rust Manchester August Talks

North America

• 2026-08-13 | Lehi, UT, US | Utah Rust
  • Utah Rust August Meetup
• 2026-08-13 | San Diego, CA, US | San Diego Rust
  • San Diego Rust August Meetup - Back in person!
• 2026-08-15 | San Francisco, CA, US | Flower
  • BOG-A-THON 3
• 2026-08-18 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-08-19 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-19 | San Francisco, CA, US | Bay Area Rust
  • Bay Area Rust August Meetup
• 2026-08-20 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-08-20 | New York, NY, US | Rust NYC
  • Rust NYC: 'Data Shapes Your Memory' and 'Rust in Peace'
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-26 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-08-26 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA August! Rust in Quantum Computing
• 2026-08-27 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-09-03 | Saint Louis, MO, US | STL Rust
  • Cryptography + Quantum Computers
• 2026-09-08 | Montreal, QC, CA | Rust Foundation
  • Rust Teams Health Summit
• 2026-09-08 - 2026-09-11 | Montreal, QC, CA | RustConf 2026
  • RustConf 2026, Hosted by the Rust Foundation
• 2026-09-09 | Montreal, QC, CA | Women in Rust
  • RustConf Coffee Break Meetup

Oceania

• 2026-08-27 | Melbourne, AU | Rust Melbourne
  • Rust Melbourne Meetup

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

The AI discussion was already put to bed as off topic and derailing. Do not summon the Mods so carelessly, as they are wroth, and filled with cruel vengeance.

- Simon Buchan on rust-users

Thanks to Jonas Fassbender for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by:

• nellshamrell
• llogiq
• ericseppanen
• extrawurst
• U007D
• mariannegoldin
• bdillo
• opeolluwa
• bnchi
• KannanPalani57
• tzilist

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

12 Aug 2026 4:00am GMT