Examine source code of vaan ff12

{
  "theme": {
    "images": {
      "theme_frame": "vaan.jpg"
    },
    "colors": {
      "frame": "#4652d6",
      "tab_background_text": "#f5e4e4"
    }
  },
  "version": "2.0",
  "name": "vaan ff12",
  "manifest_version": 2
}