Examine source code of Stels VPN

{
  "manifest_version": 3,
  "name": "Stels VPN",
  "version": "1.0.0",
  "description": "Stels VPN extension",
  "background": {
    "scripts": [
      "service-worker-loader.js"
    ],
    "type": "module"
  },
  "icons": {
    "16": "src/assets/icon/alpha.png",
    "32": "src/assets/icon/alpha.png",
    "48": "src/assets/icon/alpha.png",
    "128": "src/assets/icon/alpha.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "src/assets/icon/alpha.png",
      "32": "src/assets/icon/alpha.png"
    }
  },
  "permissions": [
    "storage",
    "proxy",
    "webRequest",
    "webRequestAuthProvider"
  ],
  "host_permissions": [
    "https://panel.stelsvpn.com/*"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "stels-vpn@stelsvpn.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}