Examine source code of Disco Elysium Dark Mode

{
  "name": "Disco Elysium Dark Mode",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "theme.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(177, 182, 232, 1)",
      "toolbar": "rgba(12, 28, 46, 1)",
      "bookmark_text": "rgba(240, 240, 255, 1)",
      "toolbar_field": "rgba(4, 2, 20, 1)",
      "toolbar_field_text": "rgba(229, 230, 255, 1)",
      "tab_line": "rgba(210, 255, 125, 0.32)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7be15274-fb9b-46a8-9ef1-27aac345f887}"
    }
  }
}