Examine source code of manchester_city

{
  "theme": {
    "images": {
      "theme_frame": "m_city.jpg"
    },
    "colors": {
      "frame": "#3b3b3b",
      "tab_background_text": "#e8e8e8"
    }
  },
  "version": "2.0",
  "name": "manchester_city",
  "manifest_version": 2,
  "description": "manchester city"
}