Examine source code of Dark Marbled

{
  "name": "Dark Marbled",
  "manifest_version": 2,
  "version": "7.0",
  "theme": {
    "images": {
      "theme_frame": "21.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 0)",
      "tab_background_text": "rgba(255, 187, 0, 1)",
      "toolbar": "rgba(0, 89, 107, 0.37)",
      "bookmark_text": "rgba(66, 204, 176, 1)",
      "toolbar_field": "rgba(3, 0, 33, 0.86)",
      "toolbar_field_text": "rgba(245, 81, 218, 1)"
    }
  }
}