Examine source code of Rocky Sunset

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#573201",
      "tab_background_text": "#ffebcc"
    }
  },
  "version": "2.0",
  "name": "Rocky Sunset",
  "manifest_version": 2,
  "description": "Stock credit: tembi4\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/b70ac27f35b1e0cff833f672dc492d05ef0279215ea2e8ade5fb91ee449e4a38/http%3A//www.freeimages.com/photographer/tembi4-83277\">http://www.freeimages.com/photographer/tembi4-83277</a>"
}