Firefox 160 release notes for developers (Nightly)
This article provides information about the changes in Firefox 160 that affect developers. Firefox 160 is the current Nightly version of Firefox and ships on November 10, 2026.
Note: The release notes for this Firefox version are still a work in progress.
Changes for web developers
Changes for add-on developers
runtime.PlatformInfonow returnsarchasarm64for ARM64 platforms. Previously, it returnedaarch64. This aligns the value returned by Firefox for ARM64 platforms with Chrome. (Firefox bug 2080310)
Experimental web features
These features are shipping in Firefox 160 but are disabled by default.
To experiment with them, search for the appropriate preference on the about:config page and set it to true.
You can find more such features on the Experimental features page.