Examine source code of Ghost Modern Warfare 2

{
  "theme": {
    "images": {
      "theme_frame": "modernwarfare247_15_1920x12003.jpg"
    },
    "colors": {
      "frame": "#827f7f",
      "tab_background_text": "#080808"
    }
  },
  "version": "2.0",
  "name": "Ghost Modern Warfare 2",
  "manifest_version": 2,
  "description": "Modern Warfare 2 Ghost is here for your Firefox!"
}