Examine source code of Cat Sleeeeeeeeeping

{
  "theme": {
    "images": {
      "theme_frame": "cat.jpg"
    },
    "colors": {
      "frame": "#ebf5d5",
      "tab_background_text": "#fcf9f9"
    }
  },
  "version": "2.0",
  "name": "Cat Sleeeeeeeeeping",
  "manifest_version": 2,
  "description": "Cat made for you by <a href=\"https://outgoing.prod.mozaws.net/v1/91746f59d5a559a3490f5cddefc49c355682cf9a3dc56c315431f665f13bfeb3/http%3A//www.profesionalnet.net\" rel=\"nofollow\">www.profesionalnet.net</a>"
}