Examine source code of the simpsons doughnut

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "the simpsons doughnut",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-024-8de86d890779309c9a66423c64daa480.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(237, 145, 173)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(215, 113, 134)",
      "tab_background_text": "rgb(126, 43, 9)",
      "toolbar_field": "rgb(223, 183, 126)",
      "toolbar_field_text": "rgb(126, 43, 9)",
      "tab_line": "rgb(251, 181, 205)",
      "popup": "rgb(112, 209, 254)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(251, 181, 205)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fcbddf70-2f89-45cd-bc6d-6055186a49d3}"
    }
  }
}