Examine source code of Image Hover Zoom

{
  "manifest_version": 2,
  "name": "Image Hover Zoom",
  "version": "1.0",
  "description": "Zoom images when hovering over them",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1627bc55-6107-4da7-b621-8a2927585a9d}",
      "strict_min_version": "113.0"
    }
  }
}