Firefox Developer Tools
FREE
Set of web developer tools built into Firefox.
About
Firefox Developer Tools is a set of web developer tools built directly into the Firefox browser. It offers powerful features for debugging, editing, and optimizing websites.
Pricing
Pricing Type
Free
Last checked: February 20, 2026
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Key Facts
Categories
Platforms
Web
Company
Mozilla
Founded
Founded in 2004
Country
Global
Language
English