Examine source code of blue city lightning

{
  "theme": {
    "images": {
      "theme_frame": "lightning.jpg"
    },
    "colors": {
      "frame": "#978db3",
      "tab_background_text": "#faf7f7"
    }
  },
  "version": "2.0",
  "name": "blue city lightning",
  "manifest_version": 2,
  "description": "blue city lightning"
}