Examine source code of PolyartSea

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#7d7d7d",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "PolyartSea",
  "manifest_version": 2,
  "description": "A beautiful low-poly theme.\nGraphics generated using <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/ca4bc1aca3300501525e1de0883540b8a69ab30a684a47520b4c2f4da0fdf2a5/http%3A//qrohlf.com/trianglify-generator/\">http://qrohlf.com/trianglify-generator/</a>"
}