Examine source code of astrazero

{
  "theme": {
    "images": {
      "theme_frame": "astrazero-header2.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#d90d0d"
    }
  },
  "version": "2.0",
  "name": "astrazero",
  "manifest_version": 2,
  "description": "this Persona was created using a piece of digital art by astrazero @ <a href=\"https://outgoing.prod.mozaws.net/v1/371825ad786c66edce714aa137c713d246408124696874192d8e9e4a5ba7c5c8/http%3A//astrazero.net\" rel=\"nofollow\">astrazero.net</a> modified by me with his explicit permission and is my tribute to him and his brilliant artwork"
}