[Nightly Blog] More Kit, More Control – These Weeks in Firefox: Issue 203 https://blog.nightly.mozilla.org/2026/06/03/more-kit-more-control-these-weeks-in-firefox-issue-203/

The location permission icon in the address bar now turns red while a website is actively accessing your location, making it easier to notice when your location is being shared.
https://bugzilla.mozilla.org/2038194

Quickly pick and copy a color from any page by typing "pick color", "color picker", or "eyedropper" in the address bar and selecting the "Pick a color" quick action.

Firefox now verifies and displays Qualified Website Authentication Certificates (QWACs) in accordance with eIDAS regulations.
https://bugzilla.mozilla.org/2043399

[Nightly Blog] Backup for a Rainy Day – These Weeks in Firefox: Issue 202
https://blog.nightly.mozilla.org/2026/06/01/backup-for-a-rainy-day-these-weeks-in-firefox-issue-202/

The new JPEG XL image format support was activated today in Firefox Nightly
https://bugzilla.mozilla.org/2040074

Firefox Labs can now be opened quickly by typing "labs" or "experiment" in the address bar and selecting the Open Firefox Labs quick action.
https://bugzilla.mozilla.org/2023169

You can now generate a QR code for a page from the tab context menu (Share -> Generate QR code). https://bugzilla.mozilla.org/1996422

[Nightly Blog] Settings Are Getting a New Look!
https://blog.nightly.mozilla.org/2026/05/20/settings-are-getting-a-new-look/

"Behind the Scenes Hardening Firefox with Claude Mythos Preview" (https://hacks.mozilla.org/2026/05/behind-the-scenes-hardening-firefox/)