Firefox OS Simulator is a test environment for Firefox OS. Use it to test your apps in a Firefox OS-like environment that looks and feels like a mobile phone.
If you remove the app "System" over Settings -> App permissions -> System -> Uninstall, the simulator wont start a second time. The result is clear, but maybe you should remove this option, because it's a little bit crazy to remove the whole system.
If you remove the app "System" over Settings -> App permissions -> System -> Uninstall, the simulator wont start a second time. The result is clear, but maybe you should remove this option, because it's a little bit crazy to remove the whole system.