Examine source code of Real_Black_

{
  "name": "Real Black",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "MV5BMTg3NTkwNzAxOF5BMl5BanBnXkFtZTcwMjM1NjI5MQ@@._V1_.jpg"
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(61, 61, 61, 1)",
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(110, 110, 110, 1)",
      "bookmark_text": "rgba(181, 181, 181, 1)"
    }
  }
}