Examine source code of drei.to black

{
  "theme": {
    "images": {
      "theme_frame": "black.jpg"
    },
    "colors": {
      "frame": "#faf7f7",
      "tab_background_text": "#f79308"
    }
  },
  "version": "2.0",
  "name": "drei.to black",
  "manifest_version": 2,
  "description": "by SCR3AM for <a href=\"https://outgoing.prod.mozaws.net/v1/bddd76ff9d93b8ca0897431bb8284ffc84300a81c32160c86102568869e534b4/http%3A//drei.to\" rel=\"nofollow\">drei.to</a>"
}