Software Extensions Enable machine-wide extensions — Enable GNOME Shell extensions for all users. Lock down enabled extensions — Disallow the user to enable or disable GNOME Shell extensions. What are GNOME Shell extensions? — GNOME Shell extensions allow customizing the default GNOME Shell interface. Management Add a custom MIME type for all users — Create a MIME type specification and register a default application. Add a custom MIME type for individual users — Create a user's MIME type specification and register a default application. Add an autostart application for all users — How can I add an autostart application for all users? Disable command-line access — Prevent users from accessing the command-line. Override the default registered application for all users — Customize which application opens a specific MIME type. Override the default registered application for individual users — Customize per user which application opens a specific MIME type. Typical processes — Which processes should I expect to see running in a pristine, stock GNOME session? What are MIME types? — MIME types are used to identify the format of a file. Daha Çok Bilgi GNOME System Administration Guide — A guide for GNOME 3 system administrators.