Examine source code of Three Blue Circles

{
  "theme": {
    "images": {
      "theme_frame": "HeaderImage.png"
    },
    "colors": {
      "frame": "#339999",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Three Blue Circles",
  "manifest_version": 2,
  "description": "This persona is light blue with three disc/circles. The font is the default black."
}