Examine source code of Best Proxy Manager

{
  "name": "Best Proxy Manager",
  "version": "1.0.1",
  "description": "The best anonymous proxy solution for you",
  "manifest_version": 2,
  "homepage_url": "https://www.vpnside.com",
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "proxy",
    "storage"
  ],
  "optional_permissions": [
    "*://*/*",
    "webRequest"
  ],
  "icons": {
    "16": "icons/16x16.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png"
  },
  "browser_action": {
    "default_title": "Best Proxy Manager",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@vpnside.com",
      "strict_min_version": "42.0"
    }
  }
}