Examine source code of Pokemon Starters mini

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#0025a6"
    }
  },
  "version": "2.0",
  "name": "Pokemon Starters mini",
  "manifest_version": 2,
  "description": "Full screen Pokemon 1st to 6th generation starters.\nArt made by <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/3eefcb22992fc97569eeaebc3b53e791e0271cae55ff645182f10237bc748b34/http%3A//www.pixiv.net/member.php%3Fid=44555\">Hoshiko</a>"
}