Examine source code of Wild Possum

{
  "theme": {
    "images": {
      "theme_frame": "Possum1.jpg"
    },
    "colors": {
      "frame": "#361f02",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Wild Possum",
  "manifest_version": 2,
  "description": "Wild New Zealand Possum. Introduced in 1837 by settlers from Australia, this pest has no natural predator and is doing a lot of damage to the native plants, animals and birds."
}