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Firefox Developer Edition vs Firefox Developer Tools: catalog facts
Firefox Developer Edition	Firefox Developer Tools
Free Free to download and use.	Free Free and included with Firefox.
Windows, macOS, Linux	Windows, macOS, Linux
Newest developer tools before they reach stable Firefox Builds for Windows, macOS and Linux, including ARM64	Built into Firefox with nothing extra to install Can debug Firefox for Android remotely
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	Only available inside Firefox Tests Firefox's engine, so other browsers still need their own tools
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	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.