Examine source code of Summer evening

{
  "theme": {
    "images": {
      "theme_frame": "ff_head.jpg"
    },
    "colors": {
      "frame": "#cfcfcf",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Summer evening",
  "manifest_version": 2,
  "description": "This foto was taken in Baden-Wuerttemberg (Germany) from my balcony. Last summer, there were some really beautiful twilights, this is one of them. \nI hope you enjoy it."
}