Browsermob proxy server crashes websites

[arno86]

trying to use browsermob proxy server by fallowing code:

    final int port = 9000;
    server  = new ProxyServer(port);
    server.start();         
    final DesiredCapabilities dc = new DesiredCapabilities();
    dc.setCapability(CapabilityType.PROXY, server.seleniumProxy());         
    setName("test");
    FirefoxBinary binary = new FirefoxBinary(new File("C:\\Program Files (x86)\\ff21\\firefox.exe"));
    File profileDir = new File("C:\\Users\\arno\\Documents\\profiles\\firefox21.default");
    FirefoxProfile profile = new FirefoxProfile(profileDir);
    driver = new FirefoxDriver(binary, profile, dc);//;
    server.newHar("monitis");

but it crashes the website: see the capture .
and the console capture

I'm using
Selenium 2.43
Mozilla FF 21
browsermob-proxy-2.0-beta-3.jar