Examine source code of SmartCopy

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "short_name": "__MSG_appShortName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "4.16.4.0",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "smartcopy@historylink.herokuapp.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_icon": "images/icon.png",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "images/icon.png",
        "images/content_*.png"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.geni.com/*"
      ],
      "js": [
        "jquery.js",
        "jquery.csv.min.js",
        "moment.js",
        "parse-names.js",
        "shared.js",
        "content.js"
      ]
    }
  ],
  "permissions": [
    "scripting",
    "activeTab",
    "storage",
    "tabs",
    "declarativeNetRequestWithHostAccess",
    "offscreen"
  ],
  "sandbox": {
    "pages": [
      "sandbox.html"
    ]
  },
  "host_permissions": [
    "*://*.geni.com/",
    "*://*.findagrave.com/",
    "*://*.familysearch.org/",
    "*://*.familysearchcdn.org/",
    "*://familysearch.org/",
    "*://*.wikitree.com/",
    "*://*.billiongraves.com/",
    "*://billiongraves.com/",
    "*://*.ancestrylibrary.com/",
    "*://*.ancestry.com/",
    "*://*.myheritage.com/",
    "*://*.mhcache.com/",
    "*://*.filae.com/",
    "*://filae.com/",
    "*://historylink.herokuapp.com/",
    "*://maps.googleapis.com/",
    "*://*.gravez.me/",
    "*://gravez.me/",
    "*://*.toldot.ru/",
    "*://toldot.ru/",
    "*://*.yadvashem.org/",
    "*://yadvashem.org/",
    "*://*.geneanet.org/",
    "*://geneanet.org/",
    "*://*.bezikaron.co.il/",
    "*://bezikaron.co.il/",
    "*://*.online-ofb.de/",
    "*://online-ofb.de/",
    "*://ofb.genealogy.net/"
  ]
}