Examine source code of Beautiful landscape

{
  "theme": {
    "images": {
      "theme_frame": "personaheadr.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Beautiful landscape",
  "manifest_version": 2,
  "description": "Image credit: axelhartmann link: <a href=\"https://outgoing.prod.mozaws.net/v1/3dce9ce6d3a3bf655413697b6efeec206eead585db41d0dc339dd9962502b15c/http%3A//www.flickr.com/photos/axelhartmann/278275400/sizes/o/in/photostream/\" rel=\"nofollow\">http://www.flickr.com/photos/axelhartmann/278275400/sizes/o/in/photostream/</a>"
}