Examine source code of NegaSonic

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxSonicSkinHeader.PNG"
    },
    "colors": {
      "frame": "#b0b0b0",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "NegaSonic",
  "manifest_version": 2,
  "description": "A Sonic Skin I created to celebrate the Hedgehog's 19th anniversary! I hope you enjoy. :)"
}