Examine source code of One Tree Hill

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#182f33",
      "tab_background_text": "#ebfcff"
    }
  },
  "version": "2.0",
  "name": "One Tree Hill",
  "manifest_version": 2,
  "description": "Stock credit: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/f7d773aeb0c34c909520c9790df97ff3e99bf373c3f23854c4d3e230e6c44568/https%3A//pixabay.com/en/users/Bessi-909086/\">Bess Hamiti\n</a>"
}