Examine source code of Stone Arch

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#e0e0e0"
    }
  },
  "version": "2.0",
  "name": "Stone Arch",
  "manifest_version": 2,
  "description": "Stock credit: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/c2b5235ada4f4d0ce00361e97bacec4456241149969449131c8b69aa033f3da9/https%3A//pixabay.com/en/users/tpsdave-12019/\">David Mark\n</a>"
}