Examine source code of gruvbox dark mode

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "gruvbox darkmode",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(40, 40, 40)",
      "toolbar_text": "rgb(69, 133, 136)",
      "frame": "rgb(60, 56, 54)",
      "tab_background_text": "rgb(177, 98, 134)",
      "toolbar_field": "rgb(80, 73, 69)",
      "toolbar_field_text": "rgb(249, 245, 215)",
      "tab_line": "rgb(152, 151, 26)",
      "popup": "rgb(40, 40, 40)",
      "popup_text": "rgb(104, 157, 106)",
      "icons": "rgb(215, 153, 33)",
      "tab_loading": "rgb(152, 151, 26)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{756bedb5-6565-4f7d-a144-4dd4cdda3b6a}"
    }
  }
}