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Firefox Nightly vs Microsoft Edge Dev / Canary: catalog facts
Firefox Nightly	Microsoft Edge Dev / Canary
Free Free and open source.	Free Free preview channels of Microsoft Edge.
Windows, macOS, Linux	Windows, macOS, Linux
Earliest access to new Firefox features Updated daily	Access to upcoming Edge features and DevTools before general release Separate install from stable Edge, so both can coexist
Pre-release builds can be unstable Not suited as a main browser for most people	Preview builds can be less stable than the regular release Not intended as a daily-driver browser for most users
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 22, 2026

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