Examine source code of Mediocre Tomorrow

{
  "theme": {
    "images": {
      "theme_frame": "tomorrow.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Mediocre Tomorrow",
  "manifest_version": 2,
  "description": "A persona for the Mediocre Show podcast.\n\n<a href=\"https://outgoing.prod.mozaws.net/v1/3e8206f6952c18e8c80c3c0c2f6ad2f291ed7ac5fc999252731c81a23333337c/http%3A//www.mediocreshow.com\" rel=\"nofollow\">www.mediocreshow.com</a>"
}