Examine source code of black hole

{
  "name": "black hole",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "BH1.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(184, 184, 184, 1)",
      "toolbar": "rgba(24, 28, 59, 1)",
      "toolbar_field": "rgba(66, 66, 66, 1)",
      "toolbar_field_text": "rgba(209, 209, 209, 1)"
    }
  }
}