Examine source code of Newgrounds2

{
  "theme": {
    "images": {
      "theme_frame": "ng.jpg"
    },
    "colors": {
      "frame": "#d6d6d6",
      "tab_background_text": "#262626"
    }
  },
  "version": "2.0",
  "name": "Newgrounds2",
  "manifest_version": 2,
  "description": "A persona build based on <a href=\"https://outgoing.prod.mozaws.net/v1/26068c0d73d94d982348e72e49d694f47d88682cf1abd023189e71aab7cf9a7e/http%3A//newgrounds.com\" rel=\"nofollow\">newgrounds.com</a>, with a light header for clarity and a dark footer for contrast."
}