Examine source code of Tree SunSet

{
  "theme": {
    "images": {
      "theme_frame": "Tree.jpg"
    },
    "colors": {
      "frame": "#f6ff45",
      "tab_background_text": "#1000a1"
    }
  },
  "version": "2.0",
  "name": "Tree SunSet",
  "manifest_version": 2,
  "description": "With a peaceful sunset, place a wonderful tree on your Firefox wall to let relaxation seep through the sunset's reays."
}