Examine source code of Ubuntu 19.04 Dark

{
  "name": "Ubuntu 19.04 Dark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Ubuntu Logo Hi-Res Color.png"
    },
    "colors": {
      "frame": "rgba(29, 29, 29, 1)",
      "tab_background_text": "rgba(177, 177, 179, 1)",
      "toolbar": "rgba(50, 50, 52, 1)",
      "bookmark_text": "rgba(233, 84, 32, 1)",
      "toolbar_field": "rgba(71, 71, 73, 1)",
      "toolbar_field_text": "rgba(157, 156, 157, 1)"
    }
  }
}