Addons.mozilla.org
Discover thousands of ways to customize your Mozilla software, or start coding and submit your own Add-on.
Mozilla Developer Center
The online hub for all things related to development of Firefox, Thunderbird and other Mozilla software.
Bugzilla
The comprehensive database of every bug or enhancement request filed for Firefox, Thunderbird and other Mozilla projects.
Mozilla.org
Home of the non-profit Mozilla Foundation. Includes info on the Mozilla Manifesto, how to donate and more.
Mozilla Labs
A virtual lab where people come together to create, experiment and play with new Web innovations and technologies.
Planet Mozilla Messaging
Wondering what’s going on in the Mozilla Messaging community? Check out this feed of blog posts from all around the Mozilla world.
MozillaZine
This community-powered site contains news, forums, help and blogs about the Mozilla Project.
Spread Thunderbird
Home of Mozilla Community Marketing, and the place to be if you want to help tell the world about Thunderbird.
QMO
Where the QA team and community work together to test and improve Firefox, Thunderbird, and other Mozilla projects.