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Firefox Nightly vs Firefox: catalog facts
Firefox Nightly	Firefox
Free Free and open source.	Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
Earliest access to new Firefox features Updated daily	Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web
Pre-release builds can be unstable Not suited as a main browser for most people	A small number of sites are still built and tested only against Chromium Mozilla’s revenue comes largely from a search deal, which shapes some defaults
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.