Examine source code of Metal Gear Knuckles

{
  "theme": {
    "images": {
      "theme_frame": "thingy.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#f2f2f2"
    }
  },
  "version": "2.0",
  "name": "Metal Gear Knuckles",
  "manifest_version": 2,
  "description": "This is mainly made of the Mushroom Hill Zone backdrop, but with a 'logo' and sprite pose from my comic's (Random Adventures of Sonic The Hedgehog) 'Metal Gear Knuckles' story arc."
}