Examine source code of Water Pattern

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#1e323d"
    }
  },
  "version": "2.0",
  "name": "Water Pattern",
  "manifest_version": 2,
  "description": "A theme for Firefox with a seamless pattern of water.  The image is available via <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/b8ac0542c40ff79e65f5827e89766d35dd3f64b69a63fd46a0cebc2d84ee49d5/http%3A//www.Tiled-bg.Blogspot.com\">www.Tiled-bg.Blogspot.com</a>"
}