Highlights The WebExtensions team has been working with other browser vendors to make it easier for extension authors to migrate to Manifest v3 To allow extensions developers to use the same manifest.json file across multiple browser vendors, extensions with a manifest.json file including both background.service_worker and background.scripts will load successfully instead of failing at install time, a warning will be logged and background.scripts will take precedence over the currently unsupported background.service_worker – Bug 1860304 The Ubuntu Snap improvements for the browser migratio ..read more

Highlights The platform team has sent an Intent to Ship for the :has selector! Currently targeting Firefox 121. There’s a new item in the content context menu in Nightly that lets you copy URLs to the clipboard, but with known tracking parameters stripped: No more manual stripping of known tracking parameters! Alex improved the JSTracer in the DevTools console by adding setInterval/setTimeout/requestAnimationFrame callbacks and DOM events in the traces (bug) You can test the JSTracer by setting devtools.debugger.features.javascript-tracing to true in about:config, and clicking the tr ..read more

Great news for people using Firefox Nightly on Debian-based Linux distributions (such as Debian, Ubuntu, Linux Mint, and others): installing, updating, and testing the latest Firefox Nightly builds just got a lot easier. We’ve set up a new APT repository for you to install Firefox Nightly as a .deb package. These packages are compatible with the same Debian and Ubuntu versions as our traditional binaries. If you’ve previously used our traditional binaries (distributed as .tar.bz2 archives), switching to Mozilla’s APT repository allows Firefox to be installed and updated like any other applicat ..read more

Highlights Extensions process support in Firefox Android is going to ride the Gecko 120 release train (tracked by Bug 1859533). This has been one of the many things blocking full support for WebExtensions on Firefox for Android. The plan is to allow users on Firefox for Android to install any supported WebExtension on addons.mozilla.org in the coming months! If you’re an addon developer, see this blog post for details. pbz added a new button for clearing your session in Private Browsing windows, enabled by default in Nightly Clear your session in the press of a button! Marc added the a ..read more

Highlights Firefox is rolling out worldwide support for Encrypted Client Hello to make your network connections even more private! Learn more about Encrypted Client Hello here Corner snapping a Picture-in-Picture window now works in Windows and Linux. Just hold the control key while moving the PiP window to snap to a corner. We’ve had this on macOS for a few years already (using the Cmd key). The DevTools debugger now runs up to 70% faster when many sources are created (alert). Thanks to Alex for the optimizations (bug, bug). Alex did a big refactor in the Debugger codebase to properly ..read more

Highlights Some more great work from our performance team means that sites using Vue.js 3.0 will run better in Firefox! We’ve added some new behaviours to session restore, and QA has given us the green light so we’ll be shipping those in Firefox 119 preffed on by default: Persisting closed tabs between sessions Expand recently closed tabs to all windows Include closed tabs from closed windows We’re also aiming to ship a brand new, more featureful version of Firefox View in Firefox 119! Coming to a Beta near you soon. A new Firefox View, coming soon to a browser near you! Chrome Exte ..read more

Highlights Several Developer Tools updates landed thanks to the DevTools team and fellow contributors. Be sure to check out the DevTools section for more details. Nicolas enabled the shape highlighter in devtools for offset-path property (bug) Logan Rosen fixed a color contrast issue in the inspector image preview (bug) We’re in the midst of improving our device migration page on SUMO to be less verbose and to move the wizard higher up on the page. We’re also looking to experiment with some illustrations! Thanks to Outreachy contributor Anna (:annhermy), we’re getting closer to havin ..read more

Highlights Mozilla published its standards position on the Web Environment Integrity API proposal draft put forward by the Google Chrome team. A new version of Firefox View is in Nightly behind the browser.tabs.firefox-view-next pref; it is still a Work-in-Progress but it’s undergoing QA testing now The new version includes sections to show your recent browsing, your currently open and recently closed tabs, tabs from other devices, and browsing history. The Necko team has landed some HTTP/2 upload speed improvements, and we’re seeing results with significant improvements in the 50th perce ..read more

Highlights Firefox 115 was released last week! Firefox 115 ESR also went out, which is the last release series that Mozilla will be supporting for Windows 7 and 8 as well as macOS 10.12, 10.13 and 10.14. Users on those operating systems will automatically move to the ESR channel if they’re using release or beta. Mozilla will continue providing security updates for those users on ESR until at least September 2024. As part of the second iteration on the Quarantined Domains project for WebExtensions, we’ve updated the SUMO page to (1) describe the motivations behind the feature and (2) mention t ..read more

Highlights We were able to disable some Spectre / Meltdown JIT mitigations! Nightly-only for now. These were mitigations we deployed years ago to protect users against various timing attacks. With Fission shipped, and ORB enabled on Nightly “This improves performance for JS-heavy workloads: at least 6% on JetStream 2 and 2-3% for a number of the TodoMVC sub tests in Speedometer 3.” niklas landed a brand new Picture-in-Picture control: a volume slider! We used to only have a mute toggle, but now you can have better control of the volume level If you see any issues with the slider, you ..read more