Examine source code of UltraDark

{
  "name": "UltraDark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2022-02-14 at 11-15-14 replit.png"
    },
    "colors": {
      "frame": "rgba(45, 45, 45, 1)",
      "tab_background_text": "rgba(104, 186, 237, 1)",
      "toolbar": "rgba(45, 45, 45, 1)",
      "bookmark_text": "rgba(57, 176, 78, 1)",
      "toolbar_field": "rgba(45, 45, 45, 1)",
      "toolbar_field_text": "rgba(43, 149, 255, 1)",
      "tab_line": "rgba(57, 176, 78, 1)"
    }
  }
}