Examine source code of Pikachu for Firefox 4

{
  "theme": {
    "images": {
      "theme_frame": "pikachunagweg.jpg"
    },
    "colors": {
      "frame": "#854c0f",
      "tab_background_text": "#261801"
    }
  },
  "version": "2.0",
  "name": "Pikachu for Firefox 4",
  "manifest_version": 2,
  "description": "For all Pokemon fans!\n\nThis works with Firefox 4, I'm not sure about other versions."
}