Examine source code of Green and Black Web

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Green and Black web",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(62, 66, 59)",
      "toolbar_text": "rgb(98, 189, 51)",
      "frame": "rgb(11, 13, 11)",
      "tab_background_text": "rgb(83, 144, 47)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(65, 205, 58)",
      "tab_line": "rgb(169, 248, 112)",
      "popup": "rgb(62, 66, 59)",
      "popup_text": "rgb(132, 245, 66)",
      "tab_loading": "rgb(169, 248, 112)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7af6094-1d33-48ab-bcb6-b46d5417c0f7}"
    }
  }
}