Examine source code of roberta.roberta

{
  "theme": {
    "images": {
      "theme_frame": "roberta.roberta.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "roberta.roberta",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/c9c15bb4a7a194d813ae404b07d4d01de08e0f07c7e40871af1f28b60754c6e6/http%3A//www.robertaroberta.com\" rel=\"nofollow\">www.robertaroberta.com</a>"
}