For Developers

Developers can help Mozilla by fixing bugs, adding new features, making Mozilla smaller and faster, and making Mozilla development easier for others.

How To Get In Touch With Mozilla Developers

You can find many Mozilla (and Firefox, Thunderbird, Camino, etc.) developers on IRC. You can talk with them in real time by logging on's chat server, with an IRC client. Mozilla comes bundled with a chat client, ChatZilla, which is available for Firefox as an extension.

Build Mozilla

Get the Source, then Build It.

Tools & Resources

For Testers

Our products are what they are because of the help of people just like you who use them day to day, reporting bugs and helping us improve quality. To get involved, read about how you can help to test Mozilla.

Report A Bug      Find Bugs      Go To Bug #:

Nightly Builds

Created most weekdays from the previous day's work, these builds may or may not work. Use them to verify that a bug you're tracking has been fixed.

We make nightly builds for testing only. We write code and post the results right away so people like you can join our testing process and report bugs. You will find bugs, and lots of them. Mozilla might crash on startup. It might delete all your files and cause your computer to burst into flames. Don't bother downloading nightly builds if you're unwilling to put up with problems.