Examine source code of Glue User Clean Dark

{
  "name": "Clean Dark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "blank.png"
    },
    "colors": {
      "frame": "rgba(46, 46, 46, 1)",
      "tab_background_text": "rgba(186, 186, 186, 1)",
      "toolbar": "rgba(61, 60, 60, 1)",
      "bookmark_text": "rgba(143, 140, 140, 1)",
      "toolbar_field": "rgba(82, 79, 79, 1)",
      "toolbar_field_text": "rgba(161, 158, 158, 1)"
    }
  }
}