Mozilla uses Python at nearly all stages of the build and release process. The goal of this talk is to give an overview of the various ways Python are used in a large scale infrastructure for shipping desktop and mobile applications.

In brief the flow is: version control (hg in python) -> taskcluster (node) -> build system (python) -> signing (python) -> publishing (python). Firefox’s update server (Balrog) is completely written in Python and serves millions of requests each day.

All of our code is developed in the open, and so you can follow along and see for yourself how Mozilla builds and ships Firefox to the world!