Examine source code of Bird on a tree

{
  "theme": {
    "images": {
      "theme_frame": "Header_birdie.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Bird on a tree",
  "manifest_version": 2,
  "description": "You want to wear this yourself? Just visit my new store: <a href=\"https://outgoing.prod.mozaws.net/v1/aa167e3b17df166f903c45735cca6986db30bc996727c22e67bebd36e2ac108a/http%3A//f-chen.spreadshirt.de/\" rel=\"nofollow\">http://f-chen.spreadshirt.de/</a>"
}