Examine source code of PreludePower

{
  "theme": {
    "images": {
      "theme_frame": "001.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "PreludePower",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/2442f94f373db4c891e2a53d3020769254dbaf95c546c7799262b6ac83c78288/http%3A//preludepower.com\" rel=\"nofollow\">preludepower.com</a>"
}