Examine source code of ferrishine

{
  "theme": {
    "images": {
      "theme_frame": "firefoxblueth.jpg"
    },
    "colors": {
      "frame": "#2b1d8e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "ferrishine",
  "manifest_version": 2,
  "description": "Deep blue and silver-gray cubes and abstract shapes set against a dark background."
}