Python 2.7 Firefox与selenium一起使用时挂起

我正在使用selenium和firefox webdriver解析网页。我的selenium版本是2.42.1，firefox版本是30.0。点击“显示更多结果”按钮后，firefox挂起。我的代码写在下面。可能进行哪些编辑以防止其挂起

from random import randint
from selenium import webdriver
import time
driver = webdriver.Firefox()
driver.get("http://www.flipkart.com/mobiles/pr?p%5B%5D=facets.price_range%255B%255D%3DRs.%2B2000%2Band%2BBelow&p%5B%5D=sort%3Dpopularity&sid=tyy%2C4io&ref=c3bdacf2-56b7-49d6-a8bc-91b95e6031bf")
for i in range(4):
    driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    time.sleep(4)
while True:
  try:
    driver.find_element_by_xpath('//*[@id="show-more-results"]')  
    try:
        driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
        time.sleep(4)
        driver.find_element_by_xpath('//*[@id="show-more-results"]').click()
        time.sleep(randint(7,9))
    except Exception as e:
       continue
  except Exception as d:
   break

---

我想你必须卸载Firefox浏览器中的Skype插件/扩展。在我拆下它后，它对我来说就像一个符咒。试试看