Examine source code of IPBurger Proxy & VPN v2

{
  "name": "IPBurger Proxy Manager",
  "description": "IPBurger's Fresh, Dedicated and Unlimited VPN directly in Firefox",
  "version": "2.2.10",
  "manifest_version": 2,
  "icons": {
    "48": "common/icons/logo-red.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "common/icons/logo-white.png"
    },
    "default_title": "IPBurgerVPN",
    "default_popup": "menu/index.html"
  },
  "background": {
    "scripts": [
      "background/index.js"
    ]
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "common/icons/**/*",
    "**/index.html",
    "**/index.js.map",
    "common/public/*",
    "common/public/**/*"
  ],
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self';",
  "homepage_url": "https://www.ipburger.com",
  "permissions": [
    "storage",
    "proxy",
    "privacy",
    "webNavigation",
    "webRequest",
    "tabs",
    "<all_urls>",
    "*://*/*",
    "webRequestBlocking",
    "webRequestAuthProvider"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d58ed22d-654b-4257-abfc-d25e083a8a22}",
      "strict_min_version": "91.1.0"
    }
  }
}