Firefox Nightly
Release Notes

Starting with Firefox 124, a simpler and more unified dialog for clearing user data is now available in Nightly builds. In addition to streamlining data categories, the new dialog also provides insights into the site data size corresponding to the selected time range.

Starting with Firefox 125, Nightly builds support resolving HTTPS DNS records with the operating system's DNS resolver on specific platforms (Windows 11, Linux, Android 10+) without requiring DNS over HTTPS to be enabled. This capability allows the use of HTTP/3 without needing to use the Alt-Svc header, upgrades requests to HTTPS when the DNS record is present, and enables wider use of ECH. This feature is expected to ship in Firefox 126.

A simpler and more unified dialog for clearing user data is now available.
In addition to streamlining data categories, the new dialog also provides insights into the site data size corresponding to the selected time range.

Enabled AV1 hardware decode acceleration on macOS for M3 Macs.

Fix for MFSA 2024-15 included in 2024-03-21 builds and newer.

For consistency with Firefox Desktop and addons.mozilla.org, Firefox for Android's "add-ons" settings have been renamed to "Extensions".

Added an option to disable/enable the Developer Tools' Split console feature

Starting with Firefox 125, the transition-behavior CSS property is now supported in Nightly builds.

Starting with Firefox 125, Nightly builds will attempt to establish TLS connections using a hybrid post-quantum key agreement mechanism (X25519+Kyber768). This may result in slow TLS handshakes or failed connections on networks with TLS intercepting middleboxes. The feature can be disabled by setting the security.tls.enable_kyber preference to false.

Starting with Firefox 126, the shape() function on clip-path property is now supported in nightly builds.

Starting with Firefox 126, the shape() function on offset-path property is supported in nightly builds.

Starting with Firefox 126, interpolation between path() function and shape() function is now supported in nightly builds.

Implemented URL.parse(). Unlike the URL constructor, which throws when parsing fails, the static URL.parse() method instead returns null.

The CSS zoom property has been enabled by default following a lot of web compatibility and standardization work in the CSSWG.

Added support for CSS Custom :state() and CustomStateSet.

Aded support for Screen Wake Lock API.

Added support for IDBFactory.databases for enumeration of IndexedDB databases.