Examine source code of Comodore C64

{
  "theme": {
    "images": {
      "theme_frame": "C64_Firfox-Persona1.png"
    },
    "colors": {
      "frame": "#808080",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Comodore C64",
  "manifest_version": 2
}