Examine source code of Sandstone Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Sandstone Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(60, 48, 31)",
      "toolbar_text": "rgb(223, 211, 188)",
      "frame": "rgb(17, 13, 6)",
      "tab_background_text": "rgb(223, 211, 188)",
      "toolbar_field": "rgb(17, 13, 6)",
      "toolbar_field_text": "rgb(223, 211, 188)",
      "tab_line": "rgb(232, 198, 54)",
      "popup": "rgb(255, 248, 213)",
      "popup_text": "rgb(17, 13, 6)",
      "button_background_hover": "rgba(255, 229, 114, 0.2)",
      "icons": "rgb(255, 245, 182)",
      "ntp_background": "rgb(17, 13, 6)",
      "ntp_text": "rgb(223, 211, 188)",
      "popup_border": "rgba(241, 195, 28, 0.2)",
      "sidebar_text": "rgb(223, 211, 188)",
      "sidebar": "rgb(17, 13, 6)",
      "tab_loading": "rgb(206, 77, 16)",
      "tab_selected": "rgb(255, 248, 213)",
      "tab_text": "rgb(17, 13, 6)",
      "toolbar_field_border_focus": "rgb(232, 198, 54)",
      "toolbar_field_focus": "rgb(255, 248, 213)",
      "toolbar_field_highlight": "rgb(120, 100, 2)",
      "toolbar_field_text_focus": "rgb(48, 40, 3)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{23e6b65d-88a1-4539-b28c-dcf3e143bbe2}"
    }
  }
}