Examine source code of Blue Moon

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#5d78b3",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Blue Moon",
  "manifest_version": 2,
  "description": "Stock Credit: Pellinni\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/7f52797a95cc837f5015b5860fa7965962d8fbf85f3dcaf8e76eb47548ce3cde/http%3A//www.freeimages.com/photographer/Pellinni-83165\">http://www.freeimages.com/photographer/Pellinni-83165</a>"
}