Examine source code of white bubblemix

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#311438",
      "tab_background_text": "#f0f0f0"
    }
  },
  "version": "2.0",
  "name": "white bubblemix",
  "manifest_version": 2,
  "description": "White bubbles on purple ground.\n\n\n\n\nMore cool things at <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/78083926696d99fe63415c10bcad83f5a3de37fd2714a9a3dc336f6a0337535a/http%3A//www.dalenryder.com/\">http://www.dalenryder.com/</a>"
}