Firefox Developer Tools

These are the tools provided by Firefox for developers to inspect web code.

We abide by our code of conduct, and expect all contributors to do the same.


News and demos

We publish news and updates to two blogs:

You’re more than encouraged to talk, write articles, or make demos about the tools. Let us know 🙂

Getting in touch


Most changes will be done via either the “pick a bug and send a patch” or “send a PR” processes.

For substantial changes, we ask that a “request for comment” (RFC) document is provided first, so we can examine what the implications of a change will be. Here is how to follow the RFC process.

People and modules

The tools are broadly divided into panels. Each panel has one or more owners, who mostly work(s) on that panel and are the best people to ask if you have specific questions about the code.