Examine source code of Schatten

{
  "theme": {
    "images": {
      "theme_frame": "sigil_135x.jpg"
    },
    "colors": {
      "frame": "#450b75",
      "tab_background_text": "#a1a608"
    }
  },
  "version": "2.0",
  "name": "Schatten",
  "manifest_version": 2,
  "description": "Sigil"
}