Examine source code of stone wall

{
  "theme": {
    "images": {
      "theme_frame": "stonewall.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#f7f088"
    }
  },
  "version": "2.0",
  "name": "stone wall",
  "manifest_version": 2,
  "description": "Photo Copyright <a href=\"https://outgoing.prod.mozaws.net/v1/c70326051353b140c9831a96b9a11db974ba3a3d1f497592c3e3f29aaafc7d75/http%3A//FreeStockImages.org\" rel=\"nofollow\">FreeStockImages.org</a>"
}