Examine source code of Cursor Converter

{
  "manifest_version": 2,
  "name": "Cursor Converter",
  "version": "1.0",
  "description": "Select text with numbers to convert currencies automatically",
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ccb5f4a-0783-4868-b095-b55cf9a87116}"
    }
  },
  "icons": {
    "48": "icons/48.png"
  },
  "permissions": [
    "storage",
    "https://cdn.jsdelivr.net/*"
  ],
  "options_page": "settings.html",
  "background": {
    "scripts": [
      "settings.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "cursor-converter.js"
      ]
    }
  ]
}