Examine source code of Rainbow Forest

{
  "theme": {
    "images": {
      "theme_frame": "forestabstract.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#f6dbfc"
    }
  },
  "version": "2.0",
  "name": "Rainbow Forest",
  "manifest_version": 2,
  "description": "forest trees tree rainbow colours colour design nature color colors abstract pastel pastels"
}