Examine source code of Dead Super Mushroom

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#a8a6a6",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Dead Super Mushroom",
  "manifest_version": 2,
  "description": "A dead super mushroom inspired by the super mushroom item from Mario games."
}