Examine source code of Abstract glowing balls

{
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "#636060",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Abstract glowing balls",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/516dd05398239c24749424046e59bf73fdf877fab7ad34dc0819a43fb417979a/https%3A//www.facebook.com/FirefoxPersonasByTobias\" rel=\"nofollow\">https://www.facebook.com/FirefoxPersonasByTobias</a>"
}