Examine source code of Kuroshitsuji Undertaker

{
  "theme": {
    "images": {
      "theme_frame": "underheader.jpg"
    },
    "colors": {
      "frame": "#de6ae8",
      "tab_background_text": "#f2a9e2"
    }
  },
  "version": "2.0",
  "name": "Kuroshitsuji Undertaker",
  "manifest_version": 2,
  "description": "Undertaker and the feather pen from Kuroshitsuji, a.k.a. Black Butler"
}