Examine source code of Dolphin Family

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#3f83ba",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Dolphin Family",
  "manifest_version": 2,
  "description": "Stock credit: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/7eca1e6a7140df18fae9dc03b5207d89302fd39a5f3f46ffa0f0cedb51829ae6/https%3A//pixabay.com/en/users/cocoparisienne-127419/\">Anja</a>"
}