Examine source code of VPN7

{
  "manifest_version": 2,
  "name": "VPN7",
  "version": "1.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "vpn7-firefox@extensions.local",
      "strict_min_version": "91.1.0"
    }
  },
  "browser_action": {
    "default_title": "VPN7",
    "default_popup": "start.html",
    "default_icon": {
      "48": "icons/icon.png"
    }
  },
  "background": {
    "scripts": [
      "assets/js/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "proxy",
    "storage",
    "clipboardRead",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}