Examine source code of Time Machine by M♥Donna

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#fffcfc",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Time Machine by M♥Donna",
  "manifest_version": 2,
  "description": "My wallpaper to match is at: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/75673aea08ee6ba4775134fdcb3f52fd2b8e861e0c4cc83839620cd18ea90b30/https%3A//abstract.desktopnexus.com/wallpaper/2277216/\">https://abstract.desktopnexus.com/wallpaper/2277216/</a>"
}