Examine source code of Sicily Firefox

{
  "theme": {
    "images": {
      "theme_frame": "Sicily_Firefox_header_1280.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#fcf9f9"
    }
  },
  "version": "2.0",
  "name": "Sicily Firefox",
  "manifest_version": 2,
  "description": "Strait Of Messina, Sicily, Italy.\nThis persona is adapted for 1280x monitor resolution"
}