Examine source code of Material Dark Chocolate

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark chocolate",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(25, 25, 25)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(154, 160, 166)",
      "toolbar_field": "rgb(46, 46, 46)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 0, 4, 0.69)",
      "popup": "rgb(20, 20, 20)",
      "popup_text": "rgb(255, 255, 255)",
      "icons": "rgb(178, 180, 182)",
      "tab_text": "rgb(255, 245, 157)",
      "tab_loading": "rgba(255, 0, 4, 0.69)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{404d4a5c-58ef-43ba-8c07-199f7e644e40}"
    }
  }
}