Examine source code of Shadow Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Shadow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-013-06591d4ad28ab7b9ee90f62f81d6b505.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(17, 15, 21)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(9, 8, 13)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgb(19, 18, 24)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(149, 143, 232)",
      "popup": "rgb(9, 8, 13)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(9, 8, 13)",
      "tab_loading": "rgb(149, 143, 232)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{174f6d12-d535-48eb-ace9-2ddc1c9fd5ec}"
    }
  }
}