It's open source, and you can file bugs and submit patches. We provide free hosting and update services and can help you reach a large audience of users. Add-ons support user choice and customization in Firefox, and you can contribute in the following ways: Mozilla is a non-profit champion of the Internet, we build Firefox to help keep it healthy, open and accessible. Some add-ons listed on AMO have been automatically published and may be subject to review by a team of editors once publicly listed. The add-ons listed here are created by thousands of developers and theme designers from all over the world, ranging from individual hobbyists to large corporations. If you are looking for add-ons for Thunderbird or SeaMonkey, please visit or /seamonkey.
Add-ons help you modify and personalize your browsing experience by adding new features to Firefox, enhancing your interactions with Web content, and changing the way your browser looks. (AMO), is Mozilla's official site for discovering and installing add-ons for the Firefox browser.
