Firefox Nightly 🔥

Latest Firefox for Desktop development, live from Bugzilla!

[Firefox Nightly 🔥 @FirefoxNightly]

Starting with Firefox 161, Firefox Nightly supports the CSS margin-trim property for block containers, which removes the margins of child elements at the container's edges.
https://t.co/ba4jZobYHL

[Firefox Nightly 🔥 @FirefoxNightly]

Starting with Firefox 162, Firefox Nightly now supports the ident() arbitrary substitution function, which allows authors to dynamically construct identifiers by concatenating other values. The ident() function can be used wherever an <ident> is accepted.
https://t.co/fQCREXq534

[Firefox Nightly 🔥 @FirefoxNightly]

Fixed the Developer Tools eyedropper showing the wrong colors after the page is scrolled.
https://t.co/j6razwUt5U

[Firefox Nightly 🔥 @FirefoxNightly]

Starting with Firefox 161, the address bar in Firefox Nightly explains why some results are shown, such as when a page was last visited or bookmarked.
https://t.co/APruiEO1p4

[Firefox Nightly 🔥 @FirefoxNightly]

Browsing history imported from Chrome now includes how often you visited each page, so the sites you use most rank higher in address bar suggestions and shortcuts.
https://t.co/8vTfxW8TY8

[Firefox Nightly 🔥 @FirefoxNightly]

Cross-document CSS view transitions are enabled on Firefox nightly
https://t.co/PIrwyPRYCs

[Firefox Nightly 🔥 @FirefoxNightly]

Firefox Security & Privacy Newsletter 2026 Q3 | Attack & Defense
https://t.co/TbzU77CN2n

[Firefox Nightly 🔥 @FirefoxNightly]

Firefox now supports [nested arbitrary substitution functions][1] in the primary parameters of var(), attr(), and env(); for example, var(attr(data-theme-prop type(<custom-ident>))) and env(var(--safe-area-block-start)).
https://t.co/XYdmBDtnrH

[Firefox Nightly 🔥 @FirefoxNightly]

Tab groups are now listed in the application menu, making it easier to find and reopen them
https://t.co/BmRUqeDf4y

[Firefox Nightly 🔥 @FirefoxNightly]

Fixed typing with an input method, such as for Japanese or Korean, stopping after the first character in Canva Docs.
https://t.co/PGIaNYeSBg

[Firefox Nightly 🔥 @FirefoxNightly]

@s_hentzschel Maybe you can file this bug as a dependency of the implementation bug.

[Firefox Nightly 🔥 @FirefoxNightly]

Starting with Firefox 161, the search engine button in the address bar is always visible in Firefox Nightly, not only when the address bar is focused.
https://t.co/bb9sJgvo1f

[Firefox Nightly 🔥 @FirefoxNightly]

Fixed some tabs not being restored after a restart when the saved session referred to a tab group that no longer existed.
https://t.co/RsJ3WWVFAT

[Firefox Nightly 🔥 @FirefoxNightly]

Fixed WebRTC video calls with some services sending low-resolution H.264 video since Firefox 158.
https://t.co/549I6ufG2F

[Firefox Nightly 🔥 @FirefoxNightly]

Fixed Firefox hanging on macOS 26+ when opening Spotlight with a large number of bookmarks.
https://t.co/u8HNUjRncq

[Firefox Nightly 🔥 @FirefoxNightly]

Firefox now supports the random() CSS function, which allows authors to introduce randomness into their styles, generating a random value in a given range. https://t.co/6GBfFti9gk

[Firefox Nightly 🔥 @FirefoxNightly]

On macOS, keyboard shortcuts assigned to Firefox menu items in System Settings now replace the built-in shortcuts for those items.
https://t.co/59lKEdlVIW

[Firefox Nightly 🔥 @FirefoxNightly]

Fixed the Windows taskbar staying visible over full-screen Firefox windows after switching back from another application.
https://t.co/hKUVRwkF1N

[Firefox Nightly 🔥 @FirefoxNightly]

Firefox roadmap: What's new and what's coming next
https://t.co/c1x9c8HCsA

[Firefox Nightly 🔥 @FirefoxNightly]

about:keyboard of course 😀

[Firefox Nightly 🔥 @FirefoxNightly]

You can now copy the current tab's URL with a keyboard shortcut. No shortcut is assigned by default, so you can choose your own key combination in about:keyword (Ctrl+shift+C for example).