Examine source code of Dark Feathers

{
  "theme": {
    "images": {
      "theme_frame": "darkfeathers.jpg"
    },
    "colors": {
      "frame": "#282c38",
      "tab_background_text": "#c2daed"
    }
  },
  "version": "2.0",
  "name": "Dark Feathers",
  "manifest_version": 2,
  "description": "Blue and blue-black with feathery-like plants."
}