Examine source code of Viewcounter for Wikipedia

{
  "manifest_version": 3,
  "version": "1.3",
  "name": "Viewcounter for Wikipedia",
  "short_name": "Viewcounter",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2b8e0e79-9c9a-4fef-975d-2a3e30319b06}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "host_permissions": [
    "*://wikimedia.org/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.wikipedia.org/*",
        "*://*.wikimedia.org/*",
        "*://*.wikiwand.com/*"
      ],
      "js": [
        "functions.js"
      ]
    },
    {
      "matches": [
        "*://*.wikipedia.org/*",
        "*://*.wikimedia.org/*"
      ],
      "js": [
        "wikipedia.js"
      ]
    },
    {
      "matches": [
        "*://*.wikiwand.com/*"
      ],
      "js": [
        "wikiwand.js"
      ]
    }
  ]
}