#Firefox 138 is around the corner, did you noticed some of the changes we made in 137? Find out in our latest blog post: https://fxdx.dev/firefox-devtools-newsletter-137/

#devtools #html #css #js #network

and since I'm late (as always you might say), you get a bonus post from @juliandescottes talking about the new network request override feature: https://fxdx.dev/network-override-in-firefox-devtools/

Makes it way easier to debug code in prod!

#Firefox 138 is around the corner, did you noticed some of the changes we made in 137? Find out in our latest blog post: https://fxdx.dev/firefox-devtools-newsletter-137/

#devtools #html #css #js #network

[Nightly Blog] A Tab Groups Scoop – These Weeks in Firefox: Issue 179 https://blog.nightly.mozilla.org/2025/04/23/a-tab-groups-scoop-these-weeks-in-firefox-issue-179/

TIL that the most recent Firefox will now show the font licensing information in the inspector. Nice!

#Firefox

Exciting news: we're shipping Temporal in Firefox 139! Temporal is a new API for working with dates and times in JS.

This is a very large feature and our implementation was contributed by a single volunteer.

Read about it in our blog post: https://spidermonkey.dev/blog/2025/04/11/shipping-temporal.html

There is a flag for container style queries in Firefox!

I repeat, there is a flag 🏁 in Firefox! 🦊

You just need to switch it to true!

Thanks, @nicolaschevobbe!

#CSS

New for WebDriver BiDi in Firefox 137: commands to install/uninstall web extensions, support for containers with event subscriptions and more at https://fxdx.dev/firefox-webdriver-newsletter-137/

And finally Firefox 136, coming with improved Inspector autocomplete, nested CSS declarations fixes and improved Network monitor: https://fxdx.dev/firefox-devtools-newsletter-136/

Let's continue with updates for version 135 which improved WebExtension debugging, added information for CHIPS cookies and provided a new `$$$()` helper in the console: https://fxdx.dev/firefox-devtools-newsletter-135/

#firefox #devtools #cookies #webExtensions

Firefox 137 is around the corner and I realized I didn't wrote DevTools release post since the beginning of the year 🫣
Let's start with updates in version 134, which brought a few fixes and some nice accessibility improvements: https://fxdx.dev/firefox-devtools-newsletter-134/

#firefox #devtools #js #a11y

New features for WebDriver BiDi in Firefox 136: subscription IDs for better event management and support for containers with preload scripts! More details at https://fxdx.dev/firefox-webdriver-newsletter-136/ 🚀

#Firefox #WebDriver

[Nightly Blog] High Profile Improvements – These Weeks in Firefox: Issue 176 https://blog.nightly.mozilla.org/2025/03/05/high-profile-improvements-these-weeks-in-firefox-issue-176/

Want to investigate a quick fix in production directly?
No need to change your source file or deploy to a server, you can test your quick fix in DevTools directly!

Learn how: https://devtoolstips.org/tips/en/override-responses-with-files/

The Network panel now allows overriding network request responses with local files.

https://bugzilla.mozilla.org/1849920

Cypress 14.1.0 now defaults to WebDriver BiDi for Firefox 135+. A major step in modernizing browser automation!

https://fxdx.dev/webdriver-bidi-becomes-the-default-for-cypress-in-firefox/

#WebDriverBiDi #Firefox

Geckodriver 0.36.0 is here!
🚀 Improved WebExtension support, precise pointer move actions, better crash handling & fixed WebAuthn endpoints

Temporal is now enabled by default in @firefoxnightly!

#Temporal #JS #Firefox

https://bugzilla.mozilla.org/show_bug.cgi?id=1946823

Interop 2025 is here; a collaboration between browser and platform vendors to provide users and web devs with quality implementations of the web. 💻

Key Focus Areas:
✨ Storage Access
✨ Web Compat
✨ WebRTC
✨ Removing Mutation Events

Read more 👇
https://hacks.mozilla.org/2025/02/interop-2025/

We now* display fonts metadata (version, designer, vendor, license, …) in @FirefoxDevTools Inspector Fonts panel

* latest @firefoxnightly , `137.0a1 (2025-02-13)`