fidzu : thunderbird

The latest version of PerfCompare is now live!

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

[andra - esanuandra ]

• PCF-391 The keyboard handling for the revision dropdown should be done differently (#926)

[david - davidmiculit ]

• Bug 2040649 - Remove Raptor framework from PerfCompare (#1042)

[kala - kala-moz ]

• Results Page: Return the scatter series for base and new back to original order (#1046)

• Bug: 2044194 Port client-side KDE mode detection from kde-widget into CommonGraph (#1045)

• Bug 2034263: Give subtest column in subtest page a max-width (#1047)

[paul - padenot]

• Two small followups on modal-work (#1049)

• Assorted fixes to improve the app when numbers are very large and not measuring time. (#1050)

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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17 Jun 2026 4:46pm GMT

WebDriver is a remote control interface that enables introspection and control of user agents. As such, it can help developers to verify that their websites are working and performing well with all major browsers. The protocol is standardized by the W3C and consists of two separate specifications: WebDriver classic (HTTP) and the new WebDriver BiDi (Bi-Directional).

This newsletter gives an overview of the work we've done as part of the Firefox 152 release cycle.

Contributions

Firefox is an open source project, and we are always happy to receive external code contributions to our WebDriver implementation. We want to give special thanks to everyone who filed issues, bugs and submitted patches.

In Firefox 152, multiple WebDriver bugs were fixed by contributors:

• Khalid AlHaddad extended the webExtension.install command to support installing web extensions enabled in Private Browsing mode.
• Sameem improved the Marionette and WebDriver BiDi screenshot commands to enforce maximum allowed dimensions.
• Amin Amir fixed a bug in browsingContext.sys.mjs where a private field was incorrectly assigned without the # prefix.

WebDriver code is written in JavaScript, Python, and Rust so any web developer can contribute! Read how to setup the work environment and check the list of mentored issues for Marionette, or the list of mentored JavaScript bugs for WebDriver BiDi. Join our chatroom if you need any help to get started!

General

• Improved the Marionette and WebDriver BiDi screenshot commands to enforce maximum allowed dimensions.

WebDriver BiDi

• Extended the webExtension.install command to support installing web extensions in Firefox enabled in Private Browsing mode.
• Improved the browser.setDownloadBehavior command to allow overriding the download target folder before the temporary file is created.
• Fixed network events to only forward in-memory cached JavaScript responses when there is a matching network event collector, avoiding unnecessary data forwarding.

Marionette

• Improved the WebDriver:Navigate and WebDriver:Refresh commands to properly report errors when triggering the navigation fails, instead of silently ignoring them.

16 Jun 2026 2:00pm GMT

The latest version of the Firefox Profiler is now live! Check out the full changelog below to see what's changed:

Highlights:

• [Nazım Can Altınova] Add source map symbolication and source view support (#6018)
  • It requires Firefox changes that will land in Firefox 154, but after these changes, you will be able to see the source mapped function names as well as the source contents!
• [fatadel] Upgrade to React 19 (#6067)
• [fatadel] Drive counter tooltips from a tooltipRows schema (#6023)
• [Markus Stange] Support reading profiles from JsonSlabs files (#6037)
• [fatadel] Replace the footer-links overlay with a settings menu (#6042)

Other Changes:

• [Nazım Can Altınova] Fix call node context menu being hidden behind source view bottom box (#6045)
• [Nazım Can Altınova] Pass --use-env-proxy only when the node version is >= 24 (#6064)
• [fatadel] Upgrade @firefox-devtools/react-contextmenu to 5.2.4 (#6066)
• [Markus Stange] Switch profiler-edit from minimist to commander (#6065)
• [Florian Quèze] Don't fail profile processing when a marker's stack field is not a backtrace (#6069)
• [fatadel] Remove unused undici-types package (#6074)
• [cathaysia] Update isLocalURL to include LAN addresses, .local domains, and hostn… (#5973)
• [Markus Stange] Fix from-url with binary profiles (#6072)
• [Markus Stange] Add an insertStackLabels helper. (#6076)
• [fatadel] Add TrackPower-tooltip-average-power-microwatt (#6080)
• [Markus Stange] Downgrade to React 19.1 to fix unusable dev build performance. (#6082)
• [spokodev] fix(FilterNavigatorBar): clip overflow so many breadcrumbs do not expand the parent (#6085)
• [Markus Stange] Move paddings inside the tree header cells. (#6002)
• [Markus Stange] Add an --insert-label-frames argument to the profiler-edit tool (#5966)
• [Markus Stange] Stop printing "error: too many arguments" during tests. (#6088)
• [Markus Stange] More additions to profiler-edit, for sp3 profiles (#6009)
• [Nazım Can Altınova] Do not rely on localized texts in the settings menu tests (#6101)

Big thanks to our amazing localizers for making this release possible:

• be: Andrei Mukamolau
• de: Ger
• de: Michael Köhler
• de: Ralf Duehnfahr
• el: Jim Spentzos
• en-CA: chutten
• en-GB: Ian Neal
• es-CL: ravmn
• fr: Théo Chevalier
• fr: wy
• fur: Fabio Tomat
• fy-NL: Fjoerfoks
• ia: Melo46
• it: Francesco Lodolo [:flod]
• nl: Mark Heijl
• ru: Valery Ledovskoy
• sr: Марко Костић (Marko Kostić)
• sv-SE: Andreas Pettersson
• tr: Grk
• tr: Selim Şumlu
• zh-CN: Olvcpr423
• zh-TW: Pin-guang Chen

Find out more about the Firefox Profiler on profiler.firefox.com! If you have any questions, join the discussion on our Matrix channel!

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16 Jun 2026 1:38pm GMT