Examine source code of MacOs CleanBlack

{
  "name": "MacOs CleanBlack",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "header-01.svg"
    },
    "colors": {
      "frame": "rgba(54, 54, 54, 1)",
      "tab_background_text": "rgba(61, 61, 61, 1)",
      "toolbar": "rgba(54, 54, 54, 1)",
      "bookmark_text": "rgba(66, 66, 66, 1)",
      "toolbar_field": "rgba(84, 84, 84, 1)",
      "toolbar_field_text": "rgba(51, 50, 50, 1)"
    }
  }
}