Examine source code of Free VPN

{
  "manifest_version": 2,
  "name": "VPN Go",
  "version": "1.3.4",
  "browser_specific_settings": {
    "gecko": {
      "id": "vpngo@vpngo.com",
      "strict_min_version": "91.1.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "VPN Go",
    "default_popup": "loading.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "proxy",
    "storage",
    "tabs",
    "clipboardRead",
    "webRequest",
    "webRequestBlocking",
    "webRequestAuthProvider",
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}