Examine source code of Coiled Snake

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#4d5942",
      "tab_background_text": "#efffe5"
    }
  },
  "version": "2.0",
  "name": "Coiled Snake",
  "manifest_version": 2,
  "description": "Image credit: Ferr Fikkers\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/2a74a0329168f5e9659ce3d7f707ee9f88b44dfdbc9fb327f30c9e90d0fcddaa/http%3A//www.freeimages.com/photographer/FerrF-57475\">http://www.freeimages.com/photographer/FerrF-57475</a>"
}