Mozilla Services is the team within Mozilla that builds/runs much of the backend infrastructure, e.g. the firefox sync servers, marketplace servers etc. The ex

Mozilla Services is the team within Mozilla that builds/runs much of the backend infrastructure, e.g. the firefox sync servers, marketplace servers etc. The existence of separate "mozilla" and "mozilla-services" github projects is largely a historical accident, since different teams started moving to github organically at different times. (Source: I work for Mozilla, on the Services team)