Examine source code of ColoredCircles

{
  "theme": {
    "images": {
      "theme_frame": "9aff0934a047ff8bb813635bdc4ccb2f.png"
    },
    "colors": {
      "frame": "#4d0040",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "ColoredCircles",
  "manifest_version": 2,
  "description": "My first job"
}