Examine source code of Simple Flotsam

{
  "theme": {
    "images": {
      "theme_frame": "SimpleFlotsamHeader.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Simple Flotsam",
  "manifest_version": 2,
  "description": "Simple Flotsam design. Images are from Neopets (<a href=\"https://outgoing.prod.mozaws.net/v1/4382561ffc212ab2ad7b653f719dca320cb92ac4c8be72e3f8c6f9fc194d80e6/http%3A//www.neopets.com\" rel=\"nofollow\">www.neopets.com</a>)."
}