Examine source code of cyberkey

{
  "manifest_version": 3,
  "name": "Password Scrambler - Defeat Keyloggers",
  "version": "1.0.0",
  "version_name": "1.0.0 Stable",
  "description": "Type passwords in any order - keyloggers get garbage, websites get your real password!",
  "author": "Mugisha Billy Chriss",
  "homepage_url": "https://cyberkey.vercel.app",
  "short_name": "PW Scrambler",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Password Scrambler",
    "default_icon": {
      "16": "icon/icon16.png",
      "48": "icon/icon48.png",
      "128": "icon/icon128.png"
    }
  },
  "icons": {
    "16": "icon/icon16.png",
    "48": "icon/icon48.png",
    "128": "icon/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "password-scrambler@billy.rw",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "data_collected": {},
        "data_used": {}
      }
    }
  },
  "offline_enabled": true
}