Examine source code of Feathery Clouds

{
  "theme": {
    "images": {
      "theme_frame": "fc-1.jpg"
    },
    "colors": {
      "frame": "#6b6b6b",
      "tab_background_text": "#daa"
    }
  },
  "version": "2.0",
  "name": "Feathery Clouds",
  "manifest_version": 2
}