Examine source code of Circles & Dots

{
  "theme": {
    "images": {
      "theme_frame": "marbles_top.png"
    },
    "colors": {
      "frame": "#feff69",
      "tab_background_text": "#ffcc69"
    }
  },
  "version": "2.0",
  "name": "Circles & Dots",
  "manifest_version": 2,
  "description": "Circles and dots=)"
}