Examine source code of Tabs counter

{
  "manifest_version": 3,
  "name": "Tabs counter",
  "version": "1.1",
  "description": "Displays the number of open tabs in your browser.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "images/window-tabs.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabs-counter@noan.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}