Examine source code of Skyclouds

{
  "theme": {
    "images": {
      "theme_frame": "sky_a.jpg"
    },
    "colors": {
      "frame": "#729eb5",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Skyclouds",
  "manifest_version": 2,
  "description": "more matched accent color\n- for the lovers of sky"
}