Examine source code of Halloween Sora

{
  "theme": {
    "images": {
      "theme_frame": "Halloweenmozcover.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Halloween Sora",
  "manifest_version": 2,
  "description": "Art by: <a href=\"https://outgoing.prod.mozaws.net/v1/aefba19ffa3f4d02792d185cb0cae9810031fd3d99f998284579fa3fe6580d8b/http%3A//captainardi.deviantart.com/\" rel=\"nofollow\">http://captainardi.deviantart.com/</a>"
}