Examine source code of X CountryBadge

{
  "manifest_version": 3,
  "name": "X CountryBadge – Twitter Account Location",
  "version": "1.3",
  "description": "Spot the real country behind every X account, no more mystery teams pretending to be local.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "declarativeNetRequest"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "X CountryBadge – Twitter Account Location",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "host_permissions": [
    "https://x.com/*",
    "https://twitter.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://x.com/*",
        "https://twitter.com/*"
      ],
      "js": [
        "accountLocationFlags.js",
        "content.bundle.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "xcb_iframe_rules",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "x-countrybadge@example.com",
      "strict_min_version": "113.0"
    }
  }
}