Examine source code of Firefox Black Jungle

{
  "theme": {
    "images": {
      "theme_frame": "Immagine.sopra.jpeg"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#030303"
    }
  },
  "version": "2.0",
  "name": "Firefox Black Jungle",
  "manifest_version": 2,
  "description": "Firefox Jungle"
}