Examine source code of Behind the ice

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ccd3db",
      "tab_background_text": "#5b83bf"
    }
  },
  "version": "2.0",
  "name": "Behind the ice",
  "manifest_version": 2,
  "description": "Mountains are covered with ice with the trees behind the ice."
}