Firefox Developer Tools Integrations

Mozilla created Firefox, a browser that protects your privacy.

Your new favorite browser is here. You'll find the latest features, high performance, and all the development tools you need for the open web. Beta includes all the latest developer tools, as well as experimental features such the multi-line console editor or WebSocket inspector. You can run it separately with a separate profile and path, so you can use it alongside beta Firefox or release. Preferences for web developers, remote debugging, and browser preferences are enabled by default. Also, the dark theme option and developer toolbar button are available. Firefox DevTools will now gray out CSS declarations that have no effect on the page. You can hover over the info icon to see a helpful message explaining why the CSS isn't being applied. It also includes a hint on how to fix it. The new Firefox DevTools can be powerful, flexible, and most importantly, hackable. This includes a JavaScript debugger that can target multiple browsers. It is built in React or Redux.