Examine source code of Hover Zoom for Thumbnails

{
  "manifest_version": 2,
  "name": "Hover Zoom for Thumbnails",
  "version": "1.0",
  "description": "Phóng to hình ảnh thumbnail khi di chuột qua.",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e5f2ce11-fe31-4f61-b69e-bf4f6b016503}"
    }
  }
}