Customise Firefox

Whether you’re new to extension development, polishing up or porting an existing extension or theme, or creating a custom enterprise solution, we’ve got the resources to support you.

Learn how to make an extension

Ready to submit or manage your extension?

Sign in to the Developer Hub to submit or manage extensions and themes.

Register for a developer account or log in to the Developer Hub
developers working on add-ons

Get involved

Connect with thousands of developers and discover more ways you can contribute to the extension ecosystem.

Learn more about the developer community

Connect with us

Twitter

Extensions Developers Newsletter

Stay up-to-date on news and events for Firefox extension developers.