Examine source code of CryptostringV9

{
  "manifest_version": 2,
  "name": "CryptostringV9",
  "version": "1.0.3",
  "description": "Protect your private messages with secure dual-password encryption, ensuring only intended recipients can decrypt them. Simply enter your message, set two unique passwords, encrypt, and share the encrypted text via any platform. The recipient must enter the same passwords to reveal the original message. This tool offers enhanced security over single-password encryption, works offline, and does not store data, making it a fast, private, and reliable solution for confidential communication.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{afebad0f-345c-49e3-b936-61e6b3461e43}"
    }
  }
}