Examine source code of Doll Black Background

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Doll Black Background",
  "manifest_version": 2,
  "description": "Illustration by Nao Tukiji.\n\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/e30879998816e0b680d8f62275d5ae138fd0cfa904d534716b4562da8ecdc82d/https%3A//www.mangaupdates.com/authors.html%3Fid=6674\">https://www.mangaupdates.com/authors.html?id=6674</a>"
}