Selenium Webdriver profile update No new window

Is it possible to switch to a new profile without opening a new window?

def proxyfunc(proxydir):
    print 'Starting proxy...'
    print proxydir
    proxyamount = sum(1 for line in open(proxydir))
    print proxyamount
    proxynum = 0
    with open(proxydir, "r") as proxy_text_file:
        for line in itertools.islice(proxy_text_file, proxynum, (proxynum + 1)):
            b = line.split(":")
            print b
            print 'making 2 variables'
            proxyip, tempproxyport = b
            print proxyip
            print tempproxyport
            proxyport = (tempproxyport.strip('n'))
            print proxyport

            if(proxynum >= proxyamount):
                proxynum = 0
            else:
                proxynum = proxynum + 1

    proxyprofile = webdriver.FirefoxProfile()
    proxyprofile.set_preference("network.proxy.type", 1)
    proxyprofile.set_preference("network.proxy.http", proxyip)
    proxyprofile.set_preference("network.proxy.http_port", proxyport)
    proxyprofile.update_preferences()

    driver = webdriver.Firefox(firefox_profile=proxyprofile)

As seen in the code above I would like to switch to a proxy and then the new profile with a proxy but when I do so it opens a new window.

Sorry for the messy code and I know its probably not efficient but I'm new to python coming from C.