Examine source code of black/purple theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(11, 0, 20)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(213, 82, 255)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "icons": "rgb(189, 128, 255)",
      "popup_highlight": "rgb(116, 0, 239)",
      "toolbar_field_border_focus": "rgb(202, 55, 255)",
      "toolbar_field_border": "rgb(191, 107, 255)",
      "toolbar_field_highlight": "rgb(112, 0, 231)",
      "tab_loading": "rgb(213, 82, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f2fde9c5-4ed1-4662-a251-db73bffdc92c}"
    }
  }
}