Examine source code of Trees with blue sky

{
  "theme": {
    "images": {
      "theme_frame": "treeshead.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ebe4e4"
    }
  },
  "version": "2.0",
  "name": "Trees with blue sky",
  "manifest_version": 2,
  "description": "trees with smoke and blue sky"
}