Examine source code of Rainbow Apple

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Rainbow Apple",
  "manifest_version": 2,
  "description": "Made using the following image: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/9815c03c3e6aeb2323e0c89da8b64338f8b0bbcfb30a7350dc351ebc80c8c3cb/https%3A//pixabay.com/en/apple-object-sliced-%25E2%2580%258B%25E2%2580%258Bapples-red-2133771/\">https://pixabay.com/en/apple-object-sliced-%E2%80%8B%E2%80%8Bapples-red-2133771/</a>"
}