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Firefox Developer Tools vs Firefox Developer Edition: catalog facts
Firefox Developer Tools	Firefox Developer Edition
Free Free and included with Firefox.	Free Free to download and use.
Windows, macOS, Linux	Windows, macOS, Linux
Built into Firefox with nothing extra to install Can debug Firefox for Android remotely	Newest developer tools before they reach stable Firefox Builds for Windows, macOS and Linux, including ARM64
Only available inside Firefox Tests Firefox's engine, so other browsers still need their own tools	Pre-release software, so it can be less stable than the regular release Not supported on Windows 8.1 and older or macOS 10.14 and older
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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