Starting Oct 2015, we will no longer publish a monthly contribution wiki page. We will use the general contribution wikis to communicate opportunities and recognize contributors.
Contribute to Firefox Marketplace and AMO
Firefox Marketplace is the only app store dedicated to providing content built with HTML5 standards and open source values. Help bring openness, freedom, and user choice to the world of app publishing—–it's easy to start contributing to this project.
addons.mozilla.org, commonly known as "AMO", is Mozilla's official site for add-ons. Add-ons let you personalize your browsing experience on Firefox so you can make it your own. Contribute to user freedom by keeping Firefox the most customizable browser available.