Examine source code of Splashtop Web Tunnel

{
  "manifest_version": 3,
  "name": "Splashtop Web Tunnel",
  "version": "1.0.2",
  "description": "Splashtop Web Tunnel provides secure access to internal web applications via encrypted web tunnels without exposing inbound ports.",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "web-tunnel@splashtop.com",
      "strict_min_version": "140.0"
    }
  },
  "permissions": [
    "nativeMessaging",
    "activeTab",
    "scripting",
    "proxy",
    "storage"
  ],
  "host_permissions": [
    "http://localhost/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "logo.png",
      "32": "logo.png",
      "48": "logo.png",
      "128": "logo.png"
    }
  },
  "icons": {
    "16": "logo.png",
    "32": "logo.png",
    "48": "logo.png",
    "128": "logo.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "logo.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}