Examine source code of VPN Switch Plus

{
  "manifest_version": 2,
  "name": "VPN Switch Plus",
  "version": "1.0",
  "description": "Simple VPN/proxy toggle switcher",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "VPN Switch Plus",
    "default_popup": "popup.html"
  },
  "permissions": [
    "proxy",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "fernandesd.a.l.va5.90@gmail.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}