Examine source code of More Subscribers

{
  "theme": {
    "images": {
      "theme_frame": "Themeeblesbannertop.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#e00000"
    }
  },
  "version": "2.0",
  "name": "More Subscribers",
  "manifest_version": 2,
  "description": "<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/ad7eb562f541a32f193448f7882f2d2c713e3a1d8a59825f9299a3f9bde6afce/http%3A//www.youtube.com/user/THEMEEBLES\">http://www.youtube.com/user/THEMEEBLES</a>"
}