Examine source code of Opeth - Black Backdrop

{
  "theme": {
    "images": {
      "theme_frame": "Opeth_Black_Header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Opeth - Black Backdrop",
  "manifest_version": 2,
  "description": "Opeth's logo on a black backdrop"
}