Examine source code of Sunset theme (dark mode)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "sunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(117, 95, 145)",
      "toolbar_text": "rgb(247, 227, 215)",
      "frame": "rgb(72, 81, 129)",
      "tab_background_text": "rgb(247, 227, 215)",
      "toolbar_field": "rgba(0, 0, 0, 0.2)",
      "toolbar_field_text": "rgb(251, 131, 165)",
      "tab_line": "rgb(251, 178, 131)",
      "popup": "rgb(117, 95, 145)",
      "popup_text": "rgb(247, 227, 215)",
      "tab_loading": "rgb(251, 178, 131)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{79c00fc3-7ec4-4a18-9b96-371a0882efef}"
    }
  }
}