Examine source code of Stained Cracked Wall

{
  "theme": {
    "images": {
      "theme_frame": "cracked.jpg"
    },
    "colors": {
      "frame": "#e3e3e3",
      "tab_background_text": "#141414"
    }
  },
  "version": "2.0",
  "name": "Stained Cracked Wall",
  "manifest_version": 2,
  "description": "A drity, grey, cracked wall."
}