Examine source code of warm-dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "warm-dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(37, 14, 0)",
      "toolbar_text": "rgb(254, 204, 152)",
      "frame": "rgb(44, 21, 0)",
      "tab_background_text": "rgb(255, 192, 112)",
      "toolbar_field": "rgb(46, 28, 2)",
      "toolbar_field_text": "rgb(255, 192, 112)",
      "tab_line": "rgb(254, 204, 152)",
      "popup": "rgb(54, 19, 1)",
      "popup_text": "rgb(254, 204, 152)",
      "icons": "rgb(255, 192, 112)",
      "ntp_background": "rgb(37, 14, 0)",
      "ntp_text": "rgb(255, 192, 112)",
      "tab_loading": "rgb(254, 204, 152)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe182b8b-50fb-4117-91fa-515d89ff23aa}"
    }
  }
}