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Firefox Developer Tools vs Eruda: catalog facts
Firefox Developer Tools	Eruda
Free Free and included with Firefox.	Free The open-source tool is available without a license fee.
Windows, macOS, Linux	Web
Built into Firefox with nothing extra to install Can debug Firefox for Android remotely	Debug a page on a real phone without remote debugging or a cable Added with a script tag or bookmarklet, no installation
Only available inside Firefox Tests Firefox's engine, so other browsers still need their own tools	It runs inside the page, so it cannot see what breaks before its own script loads Less capable than real remote debugging
Downloadable app	Web application
Open source	Open source
License: MPL-2.0	License: MIT
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 22, 2026

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