Examine source code of Black Liquid

{
  "theme": {
    "images": {
      "theme_frame": "liquid_header.jpg"
    },
    "colors": {
      "frame": "#8c8c8c",
      "tab_background_text": "#dedede"
    }
  },
  "version": "2.0",
  "name": "Black Liquid",
  "manifest_version": 2,
  "description": "made with <a href=\"https://outgoing.prod.mozaws.net/v1/38a7c182d179e552d60914744c28feaf4059a4116b75a1f6bafcc6ff39ed4258/http%3A//paint.net\" rel=\"nofollow\">paint.net</a>"
}