Examine source code of Crypto Sender

{
  "manifest_version": 3,
  "name": "Crypto Sender",
  "version": "4.1",
  "description": "Send Encrypted Messages",
  "author": "Raffaele Catapano",
  "permissions": [
    "storage",
    "clipboardWrite",
    "clipboardRead"
  ],
  "action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Crypto Sender",
    "default_popup": "index.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "crypto-sender@raffaelecatapano.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'"
  }
}