https://fxdx.dev/firefox-webdriver-newsletter-157/

Empowering everyone to build reliable and efficient software.

The team has been working hard behind the scenes laying a strong foundation for the Thunderbird iOS app, building natively from scratch.

Following the rollout of Firefox’s Shake to Summarize feature to Android devices this May, we wanted to take a closer look at the modeling work behind th

Empowering everyone to build reliable and efficient software.

https://this-week-in-rust.org/blog/2026/09/30/this-week-in-rust-671/

Hi Mozillian, In this edition, we’re exploring the new Firefox design, Mozilla’s recent partnership with Mistral to expand choice in AI-powered browsing, and several ways to get involved with MozFest. ...

Firefox 157 brings a new look. Here is what it means for the themes you have published on AMO, and what to check.

What comes to mind when you think of Firefox? Is it our best-in-class privacy features and ad blocking capabilities? Our partnerships with Wrexham, NVIDIA

Highlights Rév O'Conner added a settings popup to control the layout of the Inspector. Auto automatically switches the layout at a given toolbox width. The ...

Bugs resolved in Moz-Phab 2.21.0: bug 2068637 code review bot fails to apply patches when the parent is not known bug 2073291 moz-phab submit could load reviewers and review groups in parallel with revisions and diffs bug 2075401 “Phabricator Error: Validation errors” from moz-phab submit should display the revision Discuss these changes in #engineering-workflow on Slack or #Conduit Matrix.

We spend a lot of time browsing online. Whether you are researching for work, planning a trip, paying your bills, or scrolling through social media, your b

https://this-week-in-rust.org/blog/2026/09/23/this-week-in-rust-670/

The seasons are changing, and so is our Calendar UI. Learn more about this, Exchange support progress, contribution guidelines, and more.

Bugs resolved in Moz-Phab 2.20.0: bug 2066178 Drop support for Python 3.9 bug 2068605 preserve file logging from moz-phab list --format json and moz-phab patch --raw bug 2071586 Review queue reminders should ignore group reviews (at least optionally) bug 2073088 moz-phab submit is getting the file size from hg/git even if it could infer it from the blob itself bug 2074036 List index out of range Discuss these changes in #engineering-workflow on Slack or #Conduit Matrix.

Github Link The following changes have been pushed to bugzilla.mozilla.org: Thanks to Kohei for his work on the newly revised Guided Bug Entry form! If you want to check it out yourself, then click on the Switch to Bugzilla Helper link at the bottom of the enter bug product selection page. Normally users without canconfirm permissions will see the Guided Bug page by default which a large percentage of our Bugzilla users. Bug 1995464 - Overhaul guided bug entry form Bug 2002553 - BMO rest api...

Empowering everyone to build reliable and efficient software.

The latest version of the Firefox Profiler is now live! Check out the full changelog below to see what’s changed: Highlights: [fatadel] Show a category breakdown in profiler-cli (#6256) [fatadel] Show allocation data in the cli (#6246) [Florian Quèze] profiler-cli: add a thread list command (#6273) [Florian Quèze] profiler-cli: add a thread list command (#6273) [Nazım Can Altınova] Add a permalink command to profiler-cli for already published profiles (#6331) [Florian Quèze] profiler-cli: add...

Firefox DevTools MCP (firefox-devtools-mcp) 0.10.4 is out on npm. Changes This release only contains additional hooks and configuration files to register Firefox DevTools MCP on various third-party aggregators, as well as a new task to automatically register the mcp on https://registry.modelcontextprotocol.io/ on release. Full changelog: Release v0.10.4 · mozilla/firefox-devtools-mcp · GitHub Repository and issues: GitHub - mozilla/firefox-devtools-mcp: Model Context Protocol server for Fire...

Empowering everyone to build reliable and efficient software.

When it’s Monday morning and you’re on the subway, in a coffee shop, or squeezing in a few email replies after your morning workout, your phone becomes

Firefox DevTools MCP (firefox-devtools-mcp) 0.10.3 is out on npm. New features: New tool: close_firefox_session — ends the browser session: it releases the connection when the server is attached to an existing Firefox, and closes the browser when the server started it. New parameter: fullPage for screenshot_page — captures the whole scrollable document instead of the viewport. New parameter: downloadFolder for set_download_behavior — only used when setting the “allowed” behavior, it sets the ...

Empowering everyone to build reliable and efficient software.

Highlights Firefox 155 just released! That’s the first release that went through the full 2-week release cycle process. The WebExtensions team added a new backgrounds_area theme property so themes ...

Today at ALL IN, Canada’s largest AI and technology event, Mozilla and Mila announced a new initiative and fresh investment to build an open source AI fo

This is the second part of a two-part series in which we explore approaches to protecting children online while safeguarding privacy, security and the open web. Part one covers our ...

https://this-week-in-rust.org/blog/2026/09/16/this-week-in-rust-669/

Github Link The following changes have been pushed to bugzilla.mozilla.org: Bug 2069143 - When retrieving comments for a bug(s) via REST API, remove comments that would be collapsed in the web UI unless explicitly asking for them Bug 2070247 - Support limiting who can needinfo the Hackbot account Bug 2061445 - Migrate Bugzilla (system info) REST resource to native Mojo API Bug 1877201 - Post to bug/{bugid}/comment returns wrong comment_id Bug 2072224 - Update REST API authentication documenta...

Bugs resolved in Moz-Phab 2.19.1: bug 2071003 moz-phab patch --apply-to head moves to a detached HEAD Discuss these changes in #engineering-workflow on Slack or #Conduit Matrix.

The AI race is shifting. Again. Practically overnight, competition has expanded from “which AI model is best?” to a new high-stakes battle over which m

https://servo.org/blog/2026/09/15/one-year-of-sponsorship/

https://jonalmeida.com/til/fetch-one-off-github-contributions/

Highlights Firefox 154 went out today! Lots of goodies in there for our users, including support for NVIDIA GeForce NOW The new 2 week release cycle is now in ...

https://jonalmeida.com/til/do-not-relocate-objdir/

https://jonalmeida.com/til/relocate-objdir-mozbuild/

P.S. Apologies for the delay in publishing this edition on the community blog. The original newsletter was sent to subscribers on August 27. Firefox was leveling up in August! GeForce ...

https://this-week-in-rust.org/blog/2026/09/09/this-week-in-rust-668/

Github Link The following changes have been pushed to bugzilla.mozilla.org: Bug 1205300 - Missing: related documentation “Reporting” Bug 2068120 - Thunderbird access to “Iteration” and “Due Date” fields Bug 2066252 - Prevent save if keyword checkin-needed-tb exists without target milestone Bug 2070017 - Reinstate web bounty form Bug 2059948 - Do not offer printable recovery codes to Duo users Discuss these changes in the BMO Matrix Room

Bugs resolved in Moz-Phab 2.19.0: bug 1987220 moz-phab patch --apply-to here should apply to the original base revision and rebase, rather than applying the raw diff on HEAD bug 2016442 add moz-phab list subcommand Discuss these changes in #engineering-workflow on Slack or #Conduit Matrix.

Our goal is to remove the technical jargon, use plain language, and make it effortless to make decisions about their Thunderbird settings.

Highlights Want some Kit? Check out the store! Sebastian Zartner [:sebo] added a panel to expose @media emulation (#1692434) and provided a way to emulate ...

Empowering everyone to build reliable and efficient software.

Firefox DevTools MCP (firefox-devtools-mcp) 0.10.2 is out on npm. New tools: press_key — sends a single key, optionally with modifiers, to a snapshot element or the focused element (Return, Escape, Tab, arrows, ctrl+shift+t, …). type_text — types text key by key into the focused element, with an optional key to press afterwards. set_network_cache — bypass or restore the HTTP cache, for the selected tab or browser-wide. Useful before a performance measurement or when verifying a change a cache...

We heard you. You don’t want to open your PerfCompare performance comparison and feel like you need a background in statistics to interpret the Mann-Whitney-U results. Cliff's Delta, CLES, and ...

The latest version of PerfCompare is now live! This includes the launch of PerfCompare’s Simple View. Read the following blog post, Introducing PerfCompare’s Simple View, to learn more. Check out the change-log below to see the updates: Highlights: [kala-moz] Bug 2059826 - Simplified View: Create checkbox selection for advanced columns and display how to read the results #1069 Bug 2059830 Simplified View: Create checkbox selection for expanded row components (#1089) Bug 2068296 Simplif...

The latest version of the Firefox Profiler is now live! Check out the full changelog below to see what’s changed: Highlights: [Andrew Creskey] Show which network requests were prefetched (#6259) [Florian Quèze] profiler-cli: accept --limit 0 as unlimited, and make truncation loud (#6267) Other Changes: [Nazım Can Altınova] Update oxfmt 0.59.0 → 0.63.0 (major) (#6262) [Florian Quèze] profiler-cli: document the marker field:value search syntax (#6265) [Florian Quèze] profiler-cli: report one...

Empowering everyone to build reliable and efficient software.

https://this-week-in-rust.org/blog/2026/09/02/this-week-in-rust-667/

As many of you know, Microsoft will be disabling Exchange Web Services (EWS) support on its Microsoft 365 platform later this year. The Thunderbird Desktop team has been hard at work to ensure continuity of functionality through this transition, and today we are pleased to announce the release of native Thunderbird support for the Microsoft […]

People feel differently about AI, and here at Firefox, we think that is completely reasonable. Something else that is completely reasonable: deciding for y