Examine source code of IpProxyHelper

{
  "manifest_version": 2,
  "name": "IpProxyHelper",
  "version": "1.0.2",
  "description": "IpProxyHelper allows you set ip proxy information.http, https, socks4 and socks5 proxies are supported.",
  "browser_action": {
    "default_icon": "icons/32.png",
    "default_popup": "page/popup.html"
  },
  "permissions": [
    "proxy",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "*://*/*"
  ],
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "page/popup.html"
  ]
}