Firefox Nightly
@firefoxnightly.bsky.social
📤 945
📥 7
📝 71
Latest Firefox for Desktop development, live from Bugzilla!
https://firefox.com/nightly
[Nightly Blog] Import-ant Updates – These Weeks in Firefox: Issue 201
blog.nightly.mozilla.org/2026/04/30/i...
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Import-ant Updates – These Weeks in Firefox: Issue 201 – Firefox Nightly News
Highlights Import attributes will be supported for WebExtensions, starting in Firefox 150! This allows WebExtension authors to import CSS module scripts and JSON into their JavaScript modules. Ex...
https://blog.nightly.mozilla.org/2026/04/30/import-ant-updates-these-weeks-in-firefox-issue-201/
1 day ago
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[Nightly Blog] VPN, Split View, and Other Goodies – These Weeks in Firefox: Issue 200!
blog.nightly.mozilla.org/2026/04/27/v...
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VPN, Split View, and Other Goodies – These Weeks in Firefox: Issue 200! – Firefox Nightly News
Highlights The VPN feature is rolling out to users in the United States, the United Kingdom, Germany and France! Read more about it here. And here’s more information ...
https://blog.nightly.mozilla.org/2026/04/27/vpn-split-view-and-other-goodies-these-weeks-in-firefox-issue-200/
5 days ago
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[Nightly Blog] QR Codes, Speed Calculators, Better RAM Usage – These Weeks in Firefox: Issue 199
blog.nightly.mozilla.org/2026/04/15/q...
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QR Codes, Speed Calculators, Better RAM Usage – These Weeks in Firefox: Issue 199 – Firefox Nightly News
Highlights Thanks to overholt, macOS Nightly now has support for sharing the current tab’s URL via QR Code (Right-click tab, Share > Generate QR Code). This is held to ...
https://blog.nightly.mozilla.org/2026/04/15/qr-codes-speed-calculators-better-ram-usage-these-weeks-in-firefox-issue-199/
16 days ago
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Firefox Developer Edition and Beta: Try out Mozilla's .rpm package! - Mozilla Hacks - the Web developer blog
hacks.mozilla.org/2026/03/fire...
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Firefox Developer Edition and Beta: Try out Mozilla’s .rpm package! – Mozilla Hacks - the Web developer blog
In January, we introduced our Nightly package for RPM-based Linux distributions. Today, we are thrilled to announce it is now available for Firefox Beta! Firefox Beta is great for testing ...
https://hacks.mozilla.org/2026/03/firefox-developer-edition-and-beta-try-out-mozillas-rpm-package/
about 1 month ago
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[Gecko] Competition, Innovation, and the Future of the Web - Why Independent Browser Engines Matter
blog.mozilla.org/netpolicy/20...
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Competition, Innovation, and the Future of the Web – Why Independent Browser Engines Matter – Open Policy & Advocacy
Gecko matters because it ensures there’s an independent voice shaping how the internet evolves. Without Gecko, the landscape would be dominated by Apple and Google alone. Is that really the ...
https://blog.mozilla.org/netpolicy/2026/03/23/competition-innovation-and-the-future-of-the-web/
about 1 month ago
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Firefox & Gtk Emoji picker – Martin Stransky's Blog
mastransky.wordpress.com/2026/03/20/f...
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Firefox & Gtk Emoji picker
After nearly three years of development (it takes time to make up one’s mind) Firefox for Linux users can now enjoy seamless emoji insertion using the native GTK emoji chooser. This long-requ…
https://mastransky.wordpress.com/2026/03/20/firefox-gtk-emoji-picker/
about 1 month ago
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[Nightly Blog] Extension Theming Improvements and More – These Weeks in Firefox: Issue 198
blog.nightly.mozilla.org/2026/03/20/e...
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Extension Theming Improvements and More – These Weeks in Firefox: Issue 198 – Firefox Nightly News
Highlights Starting with Firefox 150, Firefox Desktop's theming internals have improved, allowing custom background images provided by built-in and custom themes to extend over the sidebar UI backgr...
https://blog.nightly.mozilla.org/2026/03/20/extension-theming-improvements-and-more-these-weeks-in-firefox-issue-198/
about 1 month ago
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[Nightly Blog] Firefox Profiler Dark Mode and Updated Smart Window Prompts – These Weeks in Firefox: Issue 197
blog.nightly.mozilla.org/2026/03/17/f...
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Firefox Profiler Dark Mode and Updated Smart Window Prompts – These Weeks in Firefox: Issue 197 – Firefox Nightly News
Highlights Smart Window added contextual prompts for follow-ups bug 2012208 and conversation starters bug 2014946
https://blog.nightly.mozilla.org/2026/03/17/firefox-profiler-dark-mode-and-updated-smart-window-prompts-these-weeks-in-firefox-issue-197/
about 1 month ago
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[Nightly Blog] AI Controls – These Weeks in Firefox: Issue 196
blog.nightly.mozilla.org/2026/03/10/a...
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AI Controls – These Weeks in Firefox: Issue 196 – Firefox Nightly News
Highlights Shout out to mstriemer for getting the AI Controls work landed and uplifted! You choose. We’ve also enabled New Tab with Sections by default ...
https://blog.nightly.mozilla.org/2026/03/10/ai-controls-these-weeks-in-firefox-issue-196/
about 2 months ago
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As a reminder, you can follow the general Mozilla news, team work and individual contributors work on Planet Mozilla (which has a RSS feed you can subscribe to). We have 1 to 2 blog posts per day on Planet.
planet.mozilla.org
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Planet Mozilla
Follow the pulse of the Mozilla project. Aggregated updates from the developers, designers, and volunteers building a better internet.
https://planet.mozilla.org/
3 months ago
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reposted by
Firefox Nightly
Firefox for Web Developers
3 months ago
Here's a quick rundown of what we delivered as part of Interop 2025, and what's planned for Interop 2026!
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AI Controls are available in Firefox Nightly preferences! Documentation:
support.mozilla.org/kb/firefox-a...
If you find a bug, please report it on Bugzilla via this link:
mzl.la/AIControlsFi...
Thanks!
3 months ago
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[Nightly Blog] Profile, search and wallpaper bug fixes plus more! – These Weeks in Firefox: Issue 195
blog.nightly.mozilla.org/2026/02/02/p...
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Profile, search and wallpaper bug fixes plus more! – These Weeks in Firefox: Issue 195 – Firefox Nightly News
Highlights If you were running into any problems last week opening links from other applications, specifically with Firefox being foregrounded but not opening the URL, this should now be ...
https://blog.nightly.mozilla.org/2026/02/02/profile-search-and-wallpaper-bug-fixes-plus-more-these-weeks-in-firefox-issue-195/
3 months ago
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reposted by
Firefox Nightly
Firefox for Web Developers
3 months ago
AI Controls (formally 'kill switch') are landing in today's Firefox Nightly, and will land with Firefox 148 later this month.
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[Nightly Blog] Take note – Split View is ready for testing! – These Weeks in Firefox: Issue 194
blog.nightly.mozilla.org/2026/01/26/t...
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Take note – Split View is ready for testing! – These Weeks in Firefox: Issue 194 – Firefox Nightly News
Highlights Shout-out to new contributor Lorenz A, who fixed almost 70 bugs over the past few weeks! Most of this work was modernizing some of our DevTools code to ...
https://blog.nightly.mozilla.org/2026/01/26/take-note-split-view-is-ready-for-testing-these-weeks-in-firefox-issue-194/
3 months ago
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Brussels, here we come! 🦊🇧🇪 Mozilla will be at
@fosdem.org
next weekend. Swing by our stand to meet our staff and volunteers, and join the "Browser and Web Platform" devroom on Saturday! Track schedule:
fosdem.org/2026/schedul...
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FOSDEM 2026 - Browser and web platform
https://fosdem.org/2026/schedule/track/browser-and-web-platform/
3 months ago
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Firefox & Linux in 2025
mastransky.wordpress.com/2026/01/23/f...
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Firefox & Linux in 2025
HDR YouTube video clip I used for testing Last year brought a wealth of new features and fixes to Firefox on Linux. Besides numerous improvements and bug fixes, I want to highlight some major achie…
https://mastransky.wordpress.com/2026/01/23/firefox-linux-in-2025/
3 months ago
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[Nightly Blog] Introducing Mozilla’s Firefox Nightly .rpm package for RPM based linux distributions!
blog.nightly.mozilla.org/2026/01/19/i...
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Introducing Mozilla’s Firefox Nightly .rpm package for RPM based linux distributions! – Firefox Nightly News
After introducing Debian packages for Firefox Nightly, we're now excited to extend that to RPM-based distributions. Just like with the Debian packages, switching to Mozilla’s RPM repository allows Fir...
https://blog.nightly.mozilla.org/2026/01/19/introducing-mozillas-firefox-nightly-rpm-package-for-rpm-based-linux-distributions/
3 months ago
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[Nightly Blog] Phasing Out the Older Version of Firefox Sidebar in 2026
blog.nightly.mozilla.org/2026/01/13/p...
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Phasing Out the Older Version of Firefox Sidebar in 2026 – Firefox Nightly News
Over a year ago, we introduced an updated version of the sidebar that offers easy access to multiple tools – bookmarks, history, tabs from other devices, and a selection of ...
https://blog.nightly.mozilla.org/2026/01/13/phasing-out-the-older-version-of-firefox-sidebar-in-2026/
4 months ago
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[Nightly Blog] Closing out 2025 Strong – These Weeks in Firefox: Issue 193
blog.nightly.mozilla.org/2025/12/19/c...
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Closing out 2025 Strong – These Weeks in Firefox: Issue 193 – Firefox Nightly News
Highlights Special shout-out to volunteer contributor Lorenz A for fixing a huge smattering of bugs in our DevTools code! Lorenz fixed the alignment of numeric values in Netmonitor ...
https://blog.nightly.mozilla.org/2025/12/19/closing-out-2025-strong-these-weeks-in-firefox-issue-193/
4 months ago
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[Nightly Blog] Getting Better Every Day – These Weeks in Firefox: Issue 192
blog.nightly.mozilla.org/2025/11/24/g...
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Getting Better Every Day – These Weeks in Firefox: Issue 192 – Firefox Nightly News
Highlights Collapsed tab group hover preview is going live in Firefox 145! Nicolas Chevobbe added a feature that collapses unreferenced CSS variables declarations in the ...
https://blog.nightly.mozilla.org/2025/11/24/getting-better-every-day-these-weeks-in-firefox-issue-192/
5 months ago
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bugzilla.mozilla.org/show_bug.cgi...
6 months ago
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reposted by
Firefox Nightly
Nicolas Chevobbe
6 months ago
The
@firefoxdevtools.bsky.social
JSON viewer got better in
@firefoxnightly.bsky.social
: the console offers access to the original json data via `$json`. This allows to easily manipulate the underlying data to get what you want
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[Nightly Blog] Extensions UI Improvements and More – These Weeks in Firefox: Issue 191
blog.nightly.mozilla.org/2025/10/27/e...
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Extensions UI Improvements and More – These Weeks in Firefox: Issue 191 – Firefox Nightly News
Highlights As part of improvements to the extensions panel, an empty state UI has been introduced to help users to understand why their installed extensions may not be listed ...
https://blog.nightly.mozilla.org/2025/10/27/extensions-ui-improvements-and-more-these-weeks-in-firefox-issue-191/
6 months ago
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[Nightly Blog] Smarter Search, Smoother Tools – These Weeks in Firefox: Issue 190
blog.nightly.mozilla.org/2025/10/06/s...
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Smarter Search, Smoother Tools – These Weeks in Firefox: Issue 190 – Firefox Nightly News
Highlights Google Lens support has been turned on by default in the latest nightly builds. When Google is your default search engine, and you right click an image ...
https://blog.nightly.mozilla.org/2025/10/06/smarter-search-smoother-tools-these-weeks-in-firefox-issue-190/
7 months ago
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[Nightly Blog] Firefox 144 Highlights: Faster Add-ons, Smarter DevTools, and Tab Group Boosts – These Weeks in Firefox, Issue 189
blog.nightly.mozilla.org/2025/09/22/f...
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Firefox 144 Highlights: Faster Add-ons, Smarter DevTools, and Tab Group Boosts – These Weeks in Firefox, Issue 189 – Firefox Nightly News
Highlights Leo Liu [:leoliu] added a panel for AntiTracking debugging (#1972771) behind devtools.anti-tracking.enabled Alexandre Poirot [:ochameau] added a User-defined badge in the markup view ...
https://blog.nightly.mozilla.org/2025/09/22/firefox-144-highlights-faster-add-ons-smarter-devtools-and-tab-group-boosts-these-weeks-in-firefox-issue-189/
7 months ago
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[Nightly Blog] Add-ons, Fixes, and DevTools Snacks – These Weeks in Firefox: Issue 188
blog.nightly.mozilla.org/2025/09/19/a...
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Add-ons, Fixes, and DevTools Snacks – These Weeks in Firefox: Issue 188 – Firefox Nightly News
Highlights The Timer and TODO List widget are now available to be enabled in Firefox Labs on Nightly and Beta: Firefox Desktop about:addons add-on card view ...
https://blog.nightly.mozilla.org/2025/09/19/add-ons-fixes-and-devtools-snacks-these-weeks-in-firefox-issue-188/
7 months ago
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[Nightly Blog] Webcam previews and more! – These Weeks in Firefox: Issue 187
blog.nightly.mozilla.org/2025/09/12/w...
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Webcam previews and more! – These Weeks in Firefox: Issue 187 – Firefox Nightly News
Highlights Nicolas Chevobbe added presentational hints in the Inspector's rule-view (#1212289)
https://blog.nightly.mozilla.org/2025/09/12/webcam-previews-and-more-these-weeks-in-firefox-issue-187/
7 months ago
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Mozilla - Ask a Fox event
community.mozilla.org/campaigns/as...
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Mozilla - Ask a Fox event - Mozilla Community Portal
The Mozilla Support platform (a.k.a. SUMO) receives over 20 million visits each month. It’s the go-to place for Firefox users to
https://community.mozilla.org/campaigns/ask-a-fox/
8 months ago
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Firefox Security & Privacy newsletter 2025 Q2 | Attack & Defense
attackanddefense.dev/2025/07/17/f...
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Firefox Security & Privacy newsletter 2025 Q2
Welcome to the Q2 2025 edition of the Firefox Security and Privacy newsletter!
https://attackanddefense.dev/2025/07/17/firefox-security-privacy-newsletter-2025-q2.html
8 months ago
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reposted by
Firefox Nightly
Pascal Chevrel
9 months ago
Fast, private and secure (pick three): Introducing CRLite in Firefox
blog.mozilla.org/en/firefox/c...
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Fast, private and secure (pick three): Introducing CRLite in Firefox | The Mozilla Blog
We are pleased to announce that Firefox 142 will begin production usage of our brand new certificate revocation system known as CRLite. CRLite makes your b
https://blog.mozilla.org/en/firefox/crlite/
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[Nightly Blog] Custom Profile Avatars Arrive in Nightly – These Weeks in Firefox: Issue 186
blog.nightly.mozilla.org/2025/08/04/c...
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Custom Profile Avatars Arrive in Nightly – These Weeks in Firefox: Issue 186 – Firefox Nightly News
Highlights Custom avatar picker (and more icon choices) now available in Nightly Tab Groups: 1971230 - [meta] Preview collapsed tab group on hover coming to ...
https://blog.nightly.mozilla.org/2025/08/04/custom-profile-avatars-arrive-in-nightly-these-weeks-in-firefox-issue-186/
9 months ago
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[Nightly Blog] Copy Link to Highlight in Nightly – These Weeks in Firefox: Issue 185
blog.nightly.mozilla.org/2025/07/28/c...
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Copy Link to Highlight in Nightly – These Weeks in Firefox: Issue 185 – Firefox Nightly News
Highlights The Text Fragments creation UI was just activated in Firefox Nightly allowing you to share/reference a link anchor to any text snippet in a page https://mastodon.social/@firefoxnightly/...
https://blog.nightly.mozilla.org/2025/07/28/copy-link-to-highlight-in-nightly-these-weeks-in-firefox-issue-185/
9 months ago
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Happy sysadmin day!
xkcd.com/705/
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Devotion to Duty
https://xkcd.com/705/
9 months ago
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reposted by
Firefox Nightly
Bag of Tricks for View Transitions
10 months ago
Just spotted: Firefox Nightly already supports view-transition-class from the Level 2 spec.
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reposted by
Firefox Nightly
10 months ago
Shipping WebGPU on Windows in Firefox 141 – Mozilla Gfx Team Blog
mozillagfx.wordpress.com/2025/07/15/s...
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Shipping WebGPU on Windows in Firefox 141
After years in development, we will be releasing WebGPU on Windows in Firefox 141! WebGPU gives web content a modern interface to the user’s graphics processor, enabling high-performance comp…
https://mozillagfx.wordpress.com/2025/07/15/shipping-webgpu-on-windows-in-firefox-141/
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The Text fragments creation UI was just activated in Firefox Nightly allowing you to share/reference a link anchor to any text snippet in a page
bugzilla.mozilla.org/1970641
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10 months ago
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[Nightly Blog] Highlights from Volunteer Contributors – These Weeks in Firefox: Issue 184
blog.nightly.mozilla.org/2025/07/01/h...
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Highlights from Volunteer Contributors – These Weeks in Firefox: Issue 184 – Firefox Nightly News
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 .....
https://blog.nightly.mozilla.org/2025/07/01/highlights-from-volunteer-contributors-these-weeks-in-firefox-issue-184/
10 months ago
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A foxfooding campaign was just launched by Paul, one of our core community members to help us find bugs and rough edges to the new Drag to Pin feature. Everybody is welcome to join us do some testing and report bugs!
discourse.mozilla.org/t/foxfooding...
bsky.app/profile/fire...
add a skeleton here at some point
11 months ago
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[Nightly Blog] Absolute Unit of an Update – These Weeks in Firefox: Issue 183
blog.nightly.mozilla.org/2025/06/18/a...
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Absolute Unit of an Update – These Weeks in Firefox: Issue 183 – Firefox Nightly News
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 ....
https://blog.nightly.mozilla.org/2025/06/18/absolute-unit-of-an-update-these-weeks-in-firefox-issue-183/
11 months ago
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You can now drag a tab to your pinned tabs tray to pin it, or drag it out to unpin it.
bugzilla.mozilla.org/1944907
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11 months ago
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reposted by
Firefox Nightly
Firefox for Web Developers
11 months ago
State of CSS 2025 is now open:
stateofcss.com
Browser vendors use the results of 'State of' surveys to help prioritize the features to work on. If you care about CSS, please take some time to answer it, and help shape the future of the language
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Redirecting to: /en-US
https://stateofcss.com/
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[WebRTC] One-time permissions are here to stay!
blog.mozilla.org/webrtc/one-t...
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One-time permissions are here to stay! - Advancing WebRTC
One-time camera and microphone permissions are now in Chrome (since M116), joining Firefox and Safari. This means that per-session permissions are now available to use cross-browser. Chrome calls the ...
https://blog.mozilla.org/webrtc/one-time-permissions-are-here-to-stay/
11 months ago
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[Nightly Blog] Smarter Searches – These Weeks in Firefox: Issue 182
blog.nightly.mozilla.org/2025/06/06/s...
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Smarter Searches – These Weeks in Firefox: Issue 182 – Firefox Nightly News
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 ...
https://blog.nightly.mozilla.org/2025/06/06/smarter-searches-these-weeks-in-firefox-issue-182/
11 months ago
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New Extension Data Consent Experience now available in Firefox Nightly
blog.mozilla.org/addons/2025/...
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New Extension Data Consent Experience now available in Firefox Nightly – Mozilla Add-ons Community Blog
In a previous blog post I explained that we’re working to streamline the data consent experience for extensions and allow users to consent to sharing data with extensions directly in ...
https://blog.mozilla.org/addons/2025/05/09/new-extension-data-consent-experience-now-available-in-firefox-nightly/
12 months ago
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reposted by
Firefox Nightly
MDN Web Docs
12 months ago
🧪 Experiment with Temporal in @FirefoxNightly! The New API has, 🗺️ Time Zone Support → Easy UTC conversions! 🧮 Precise Calculations → Leap years, daylight saving ✅ Built-in Parsing & Formatting → No need for third-party libraries Start exploring 👇
developer.mozilla.org/en-US/docs/...
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Temporal - JavaScript | MDN
The Temporal object enables date and time management in various scenarios, including built-in time zone and calendar representation, wall-clock time conversions, arithmetics, formatting, and more. It is designed as a full replacement for the Date object.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal
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[Nightly Blog] Keep on Rolling with Profile Improvements – These Weeks in Firefox: Issue 180
blog.nightly.mozilla.org/2025/05/05/k...
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Keep on Rolling with Profile Improvements – These Weeks in Firefox: Issue 180 – Firefox Nightly News
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 ...
https://blog.nightly.mozilla.org/2025/05/05/keep-on-rolling-with-profile-improvements-these-weeks-in-firefox-issue-180/
12 months ago
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WebExtensions Support for Tab Groups
blog.mozilla.org/addons/2025/...
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WebExtensions Support for Tab Groups – Mozilla Add-ons Community Blog
Exciting news: with yesterday’s release of Firefox 138, tab groups are now available to all users! Tab groups have been a long standing feature request for users, so it’s wonderful ...
https://blog.mozilla.org/addons/2025/04/30/webextensions-support-for-tab-groups/
12 months ago
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You asked, we built it: Firefox tab groups are here
blog.mozilla.org/en/firefox/t...
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You asked, we built it: Firefox tab groups are here | The Mozilla Blog
What happens when 4,500 people ask for the same feature? At Firefox, we build it. Tab groups have long been the most requested idea on Mozilla Connect –
https://blog.mozilla.org/en/firefox/tab-groups-community/
12 months ago
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[Nightly Blog] A Tab Groups Scoop – These Weeks in Firefox: Issue 179
blog.nightly.mozilla.org/2025/04/23/a...
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A Tab Groups Scoop – These Weeks in Firefox: Issue 179 – Firefox Nightly News
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) ...
https://blog.nightly.mozilla.org/2025/04/23/a-tab-groups-scoop-these-weeks-in-firefox-issue-179/
about 1 year ago
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