Examine source code of Transfer Forum Tool

{
  "manifest_version": 3,
  "name": "Transfer Forum Tool",
  "version": "2.5",
  "description": "Extracts reservation data and exports it as Excel or PDF.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/document.png",
      "48": "icons/document.png",
      "128": "icons/document.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "libs/*",
        "images/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "transferforum@yourdomain.com"
    }
  }
}