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Eruda vs Firefox Developer Tools: catalog facts
Eruda	Firefox Developer Tools
Free The open-source tool is available without a license fee.	Free Free and included with Firefox.
Web	Windows, macOS, Linux
Debug a page on a real phone without remote debugging or a cable Added with a script tag or bookmarklet, no installation	Built into Firefox with nothing extra to install Can debug Firefox for Android remotely
It runs inside the page, so it cannot see what breaks before its own script loads Less capable than real remote debugging	Only available inside Firefox Tests Firefox's engine, so other browsers still need their own tools
Web application	Downloadable app
Open source	Open source
License: MIT	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 22, 2026	Official website Full listing and sources Checked September 23, 2026

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