Tiny Proxy Configurator

manifest.json

{
  "name": "Tiny Proxy Configurator",
  "version": "1.0",
  "description": "A tiny and simple proxy configurator.",
  "permissions": [
    "proxy"
  ],
  "background": {
    "scripts": [
      "pac.js"
    ],
    "persistent": false
  },
  "manifest_version": 2
}

pac.js

const url = chrome.extension.getURL('proxy.pac')
chrome.proxy.settings.set(
  {
    value: {
      mode: 'pac_script',
      pacScript: {
        url,
        //mandatory: true,
      },
    },
    scope: 'regular',
  },
  () => {}
)

proxy.pac

function FindProxyForURL(url, host) {

    if ( isInNet(host, "203.104.209.71","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.87","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.184.215","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.183","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.150","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.134","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.167","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.248.135","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.7","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.39","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.71","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.103","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.135","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.167","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.215","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "125.6.189.247","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.23","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.39","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.55","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

    if ( isInNet(host, "203.104.209.102","255.255.255.255") ) {
      return "PROXY 127.0.0.1:8989";
    }

  return "DIRECT";
}