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Firefox Nightly vs Safari Technology Preview: catalog facts
Firefox Nightly	Safari Technology Preview
Free Free and open source.	Free Free download from Apple.
Windows, macOS, Linux	macOS
Earliest access to new Firefox features Updated daily	Latest WebKit engine ahead of stable Safari Runs side by side with regular Safari
Pre-release builds can be unstable Not suited as a main browser for most people	macOS only Pre-release software that may be less stable
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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