What is Marionette?

For information on Marionette (Server, Python Client, Test Harness) and how to use it, please visit the Marionette entry on Firefox source docs.

The above link also explains how to contribute to the Marionette code base. If you know JavaScript or Python, this is a good project to get involved in.
We also have a rough guide for new Marionette contributors, which introduces you to the Marionette Python Test Harness and to Mozilla development in general.

Projects

You can track our development by checking our bugs, or contacting us over on the #interop channel.