Examine source code of dusk theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dusk",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-006-51ab495c5f5dde6a3cddb22484acd00d.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(154, 140, 152)",
      "toolbar_text": "rgb(34, 34, 59)",
      "frame": "rgb(74, 78, 105)",
      "tab_background_text": "rgb(201, 173, 167)",
      "toolbar_field": "rgb(242, 233, 228)",
      "toolbar_field_text": "rgb(34, 34, 59)",
      "tab_line": "rgb(34, 34, 59)",
      "popup": "rgb(34, 34, 59)",
      "popup_text": "rgb(201, 173, 167)",
      "tab_loading": "rgb(34, 34, 59)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9c732d7-334d-49b7-a314-b3edc109b541}"
    }
  }
}