Examine source code of Return Tweet Source Label

{
  "name": "Return Tweet Source Label",
  "description": "__MSG_Description__",
  "manifest_version": 3,
  "version": "1.3.3",
  "content_scripts": [
    {
      "matches": [
        "https://*.x.com/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "host_permissions": [
    "https://*.x.com/*"
  ],
  "default_locale": "en",
  "icons": {
    "16": "icon/icon16.png",
    "48": "icon/icon48.png",
    "128": "icon/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4801724c-9d0a-48fc-b663-86400e45f940}"
    }
  }
}