Examine source code of Old Book Minimalist

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Old Book Minimalist",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(221, 181, 119)",
      "toolbar_text": "rgb(169, 116, 82)",
      "frame": "rgb(223, 201, 154)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(169, 116, 82)",
      "tab_line": "rgb(120, 106, 93)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(120, 106, 93)",
      "tab_loading": "rgb(120, 106, 93)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c1d68f1-da04-4645-9c85-9267c134e44c}"
    }
  }
}