Examine source code of Hover Zoom Plus V2

{
  "manifest_version": 2,
  "name": "Hover Zoom Plus",
  "version": "1.2",
  "description": "Enlarge images and image links on hover, with delay and smart positioning.",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ec48c40-cdde-4156-bb3e-6ea4e4990928}"
    }
  }
}