Examine source code of Young Domain Guard

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    "service_worker": "js/background.js",
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
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      "js": [
        "js/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_popup": "popup.html",
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      "16": "icons/icon-default-16.png",
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    "48": "icons/icon-default-48.png",
    "128": "icons/icon-default-128.png"
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  "browser_specific_settings": {
    "gecko": {
      "id": "{b3e7f1a2-5d4c-4a89-9c6e-8f2d1b0a3e5c}",
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      "data_collection_permissions": {
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          "none"
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}