Examine source code of Mario Bros 8-Bit

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#36c777",
      "tab_background_text": "#b30000"
    }
  },
  "version": "2.0",
  "name": "Mario Bros 8-Bit",
  "manifest_version": 2,
  "description": "8-Bit sprites of Mario and Luigi atop a green background. An unused level background from New Super Mario Bros. DS."
}