Examine source code of Where Am I

{
  "manifest_version": 3,
  "name": "Where Am I",
  "version": "1.93",
  "description": "Helps you visually identify your current ServiceNow environment.",
  "author": "Sanket Priyadarshi",
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "whereami@sanketpriyadarshi.dev"
    }
  },
  "action": {
    "default_icon": "icon.png",
    "default_title": "Where Am I"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.service-now.com/*",
        "*://*.servicenow.com/*"
      ],
      "js": [
        "injector.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "main.js"
      ],
      "matches": [
        "*://*.service-now.com/*",
        "*://*.servicenow.com/*"
      ]
    }
  ],
  "permissions": []
}