Mozilla
Menu
  • Twitter
  • Get Involved
Download Firefox Nightly

Firefox Nightly News

Let's improve quality, build after build!

  • Explore
Printing the stacktrace in logpoint

Highlights from Volunteer Contributors – These Weeks in Firefox: Issue 184

Anna Kulyk
July 1, 2025

Highlights Some Picture-in-Picture improvements have landed recently from some volunteer contributors, and should be going out in Firefox 141 on July 22nd: Thanks to new contributor nrcrast for adding a … Read more

A conversion of two cups into approximately four hundred and seventy three millilitres.

Absolute Unit of an Update – These Weeks in Firefox: Issue 183

Katherine Patenio
June 18, 2025

Highlights Henrik removed all the code related to our experimental CDP (Chrome DevTools Protocol) implementation for browser automation. We also published a fxdx.dev blog post to explain what this means … Read more

A screenshot of a Google search for “mozilla firefox shirt” in Firefox Nightly, showing the Firefox address bar’s search engine selection feature. The dropdown menu displays alternative search options including Google, Amazon, Bing, DuckDuckGo, eBay, and Wikipedia.

Smarter Searches – These Weeks in Firefox: Issue 182

Mike Conley
June 6, 2025

Highlights The Search team has enabled the new URL bar search experience by default 🎉 and fixed action mode layout. See bugs: 1967857, 1967721 Check out this blog post on … Read more

Keep on Rolling with Profile Improvements – These Weeks in Firefox: Issue 180

Anna Kulyk
May 5, 2025

Highlights Profile Management is rolling out as an experiment in Firefox 138 Notice any issues? Help us out by filing a bug report! Do you have any suggestions for improvements … Read more

A Tab Groups Scoop – These Weeks in Firefox: Issue 179

Katherine Patenio
April 23, 2025

Highlights The WebExtensions team is fast-tracking support for “tab groups”-related updates to the tabs API (the updates have landed in Nightly 139 and been uplifted to Beta 138) Bug 1959713 … Read more

Putting up Wallpaper – These Weeks in Firefox: Issue 178

Mike Conley
April 7, 2025

Putting up Wallpaper – These Weeks in Firefox: Issue 178 Highlights Custom Wallpapers for New Tab are undergoing further refinement and bugfixing! Amy just fixed an issue which would cause … Read more

Turn Tabs To Their Side – These Weeks in Firefox: Issue 177

Niklas Baumgardner
March 11, 2025

Highlights Firefox 135 goes to release today (Feb 4th)! Lots of great changes in this release! We’ve landed Bug 1936379 – Add Sidebar and Vertical Tabs checkboxes in about:preferences and … Read more

The JSON Viewer developer tool showing two very large numeric values. They are shown exactly as they're defined in the JSON, and then right next to them is an indicator displaying the numeric value that they were parsed to.

High Profile Improvements – These Weeks in Firefox: Issue 176

Mike Conley
March 5, 2025

Highlights Multiple profiles are now enabled by default in Nightly! Preffed on in Nightly only – upcoming 0.5% rollout in Beta and Release will be done via Nimbus File bugs … Read more

The Firefox New Tab page is shown with the browser logo in the top-left, the weather indicator in the top-right, and 4 columns of stories rather than 3.

New Year New Tab – These Weeks in Firefox: Issue 175

Mike Conley
January 24, 2025

Highlights Firefox 134 went out earlier this month! A refreshed New Tab layout is being rolled out to users in the US and Canada, featuring a repositioned logo and weather … Read more

Firefox on macOS: now smaller and quicker to install!

Ben Hearsum
January 23, 2025

Firefox is typically installed on macOS by downloading a DMG (Disk iMaGe) file, and dragging the Firefox.app into /Applications. These DMG files are compressed to reduce download time. As of … Read more

The "Manage Extension Shortcuts" pane from about:addons. A series of keyboard shortcut mappings for an extension is displayed - one of which is mapped to the F19 key.

Key Improvements – These Weeks in Firefox: Issue 174

Mike Conley
January 13, 2025

Highlights Nicolas Chevobbe [:nchevobbe] Added $$$ , a console helper that retrieve elements from the document, including those in the ShadowDOM (#1899558) Thanks to John Diamond for contributing changes to … Read more

Learning and Improving Every Day – These Weeks in Firefox: Issue 173

Niklas Baumgardner
December 6, 2024

Highlights Firefox 133 releases today! Lots of goodies in there, including Bounce Tracking Protection, GPU-accelerated canvas on Windows and more! Nicolas Chevobbe Enabled High Contrast Theme support (devtools.high-contrast-mode-support) on Nightly … Read more

  • Previous
  • Page1
  • Page2
  • Page3
  • Page4
  • …
  • Page20
  • Next

Recent Posts

  • Take note – Split View is ready for testing! – These Weeks in Firefox: Issue 194
  • Introducing Mozilla’s Firefox Nightly .rpm package for RPM-based linux distributions!
  • Phasing Out the Older Version of Firefox Sidebar in 2026
  • Closing out 2025 Strong – These Weeks in Firefox: Issue 193
  • Getting Better Every Day – These Weeks in Firefox: Issue 192

Recent Comments

  • David on Introducing Mozilla’s Firefox Nightly .rpm package for RPM-based linux distributions!
  • Harrie Baken on Introducing Mozilla’s Firefox Nightly .rpm package for RPM-based linux distributions!
  • tjdnjsrmsdidgkrID on Smarter Search, Smoother Tools – These Weeks in Firefox: Issue 190
  • erkolarda vardır on Highlights from Volunteer Contributors – These Weeks in Firefox: Issue 184
  • Monchi on Introducing Mozilla’s Firefox Nightly .deb Package for Debian-based Linux Distributions

Archives

  • January 2026
  • December 2025
  • November 2025
  • October 2025
  • September 2025
  • August 2025
  • July 2025
  • June 2025
  • May 2025
  • April 2025
  • March 2025
  • January 2025
  • December 2024
  • November 2024
  • October 2024
  • September 2024
  • August 2024
  • July 2024
  • June 2024
  • May 2024
  • April 2024
  • March 2024
  • February 2024
  • January 2024
  • December 2023
  • November 2023
  • October 2023
  • August 2023
  • July 2023
  • June 2023
  • May 2023
  • April 2023
  • March 2023
  • February 2023
  • January 2023
  • December 2022
  • November 2022
  • October 2022
  • September 2022
  • July 2022
  • June 2022
  • May 2022
  • April 2022
  • March 2022
  • February 2022
  • January 2022
  • December 2021
  • November 2021
  • October 2021
  • September 2021
  • August 2021
  • June 2021
  • May 2021
  • April 2021
  • March 2021
  • February 2021
  • January 2021
  • December 2020
  • November 2020
  • October 2020
  • September 2020
  • August 2020
  • July 2020
  • May 2020
  • April 2020
  • March 2020
  • February 2020
  • November 2019
  • October 2019
  • September 2019
  • August 2019
  • July 2019
  • June 2019
  • May 2019
  • April 2019
  • March 2019
  • February 2019
  • January 2019
  • November 2018
  • October 2018
  • September 2018
  • August 2018
  • July 2018
  • June 2018
  • May 2018
  • April 2018
  • March 2018
  • February 2018
  • January 2018
  • December 2017
  • November 2017
  • October 2017
  • September 2017
  • August 2017
  • July 2017
  • June 2017
  • May 2017
  • April 2017
  • March 2017
  • February 2017
  • January 2017
  • December 2016
  • November 2016
  • October 2016
  • September 2016
  • August 2016
  • July 2016

Love the Web?

Get the Mozilla newsletter and help us keep it open and free.

We will only send you Mozilla-related information.

Thanks!

If you haven’t previously confirmed a subscription to a Mozilla-related newsletter you may have to do so. Please check your inbox or your spam filter for an e-mail from us.

Mozilla
Mozilla
  • About
  • Contact Us
  • Donate
    • Twitter (@mozilla)
    • Instagram (@mozillagram)
Firefox
  • Download Firefox
  • Desktop
  • Mobile
  • Features
  • Beta, Nightly, Developer Edition
    • Twitter (@firefox)
    • YouTube (firefoxchannel)
  • Website Privacy Notice
  • Cookies
  • Legal

Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation.

Portions of this content are ©1998-2026 by individual contributors. Content available under a Creative Commons license.