Examine source code of Rei Ayanami-

{
  "theme": {
    "images": {
      "theme_frame": "AyanamiRei.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#011226"
    }
  },
  "version": "2.0",
  "name": "Rei Ayanami-",
  "manifest_version": 2,
  "description": "Some spare time :P"
}