Examine source code of Abyssal Fleet

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Abyssal Fleet",
  "manifest_version": 2,
  "description": "Image by infukun\n\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/1179c20ad9e3c3c0aa84bd7039f786dc70119e0a4c8d4eb1cc5eb31e874c40d6/https%3A//www.pixiv.net/member_illust.php%3Fmode=medium&amp;illust_id=47263624\">https://www.pixiv.net/member_illust.php?mode=medium&amp;illust_id=47263624</a>"
}