Examine source code of Fourleaf Cloverfield

{
  "theme": {
    "images": {
      "theme_frame": "Fourleaf_cloverfield_header.jpg"
    },
    "colors": {
      "frame": "#ccf2a9",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Fourleaf Cloverfield",
  "manifest_version": 2,
  "description": "Field of four-leaf clover. Should be populair in Ireland. Photo taken in botanical gardens, Leiden, The Netherlands. Good Luck!"
}