The Services.jsm JavaScript code module offers a wide assortment of lazy getters that simplify the process of obtaining references to commonly used services.

To use it, you first need to import the code module into your JavaScript scope:

Components.utils.import("resource://gre/modules/Services.jsm");

Then you can obtain references to services by simply accessing them from the Services object exported by the code module. For example, to obtain a reference to the preferences service:

var prefsService = Services.prefs;