Examine source code of Spotlight Zoom

{
  "manifest_version": 2,
  "name": "Spotlight Zoom",
  "version": "1.0",
  "description": "Zoom in on a hovered part of an image like a magnifier, blurring other parts.",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "zoom.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bbcb43a6-52c1-4445-9e6d-c3bb1d56cac5}"
    }
  }
}