There are a lot of ways to contribute to the Mozilla project, and QA is one of the easiest ways to get started!  Our community is made up of a few different types of people... which ones do you want to be a part of?

Testers: Anyone can help us test!  Millions already do by using Firefox and submitting crash data and feedback , but we are always looking for more people to use Litmus and help us create better test cases. The Mozilla QA team is always working on some new release, and to get more test coverage from the community, we often have Test Days to get focused testing on a particular build or feature.

Buggers: The heart of Mozilla QA is Bugzilla . Our bug tracking system is where most of the interaction between the community, qa, and developers happens. That is why it's important to keep bugs updated through regular triage and help identify, reproduce, and verify bugs. We have Bug Days every Tuesday to give the community a chance to work with the Mozilla QA team and other "buggers" on Bugzilla related activities.

Analyzers - We collect a lot of information from our millions of uses.  We have Talkback to collect crash reports, Hendrix to gather user feedback, and the Website Reporter to find out which sites out there are broken.  If you like digging through tons of information, help us weed out the valuable crash bugs, help users with their issues, and tell web developers to improve their sites for maximum cross-browser compatiblity!

Automators - Are you a hacker?  The QA team is always working on new tools and automation to improve the quality of our products.  There are a number of projects going on right now, so have a look and see if you can contribute to one of them.