function randomInteger(min, max) {
  var rand = min + Math.random() * (max - min)
  rand = Math.round(rand);
  return rand;
}
function UserAgent() {
    var frt = (randomInteger(1, 12));
    var agent = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];;
    var Cc = Components.classes,
        Ci = Components.interfaces;
    var prf = Cc['@mozilla.org/preferences-service;1'].getService(Ci.nsIPrefBranch);
    var str = Cc['@mozilla.org/supports-string;1'].createInstance(Ci.nsISupportsString);
    str.data = agent[frt];
    prf.setComplexValue('general.useragent.override', Ci.nsISupportsString, str);
}

var file = 'proxy.txt';    

for (i=1;;i++) {
    if(!(i%10)) {
        iimPlayCode('SET !DATASOURCE '+file+' \n SET !DATASOURCE_LINE '+i+' \n SET !EXTRACT {{!COL1}}');
        proxy = iimGetLastExtract().split(':')
        var ip   =  proxy[0]
        var port =  proxy[1]
        var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
        prefs.setIntPref("network.proxy.type", 1);
        prefs.setBoolPref("network.proxy.share_proxy_settings", true);
        prefs.setCharPref("network.proxy.http", ip);
        prefs.setIntPref("network.proxy.http_port", port);
    
        iimPlayCode('pause');
    }
}