Examine source code of Darker Daffodils 2

{
  "theme": {
    "images": {
      "theme_frame": "Dark-Daffodils-Header3.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Darker Daffodils 2",
  "manifest_version": 2,
  "description": "Dark green brush-stroke foliage with pale yellow daffodils brings spring to your browser in a more sophisticated hue."
}