Examine source code of Blue Head

{
  "theme": {
    "images": {
      "theme_frame": "Naamloos-1.jpg"
    },
    "colors": {
      "frame": "#9cd0f0",
      "tab_background_text": "#00002b"
    }
  },
  "version": "2.0",
  "name": "Blue Head",
  "manifest_version": 2,
  "description": "A very good skin!"
}