#coding=utf-8

 #Import webdriver  time module

 from selenium import webdriver

 import time

 driver = webdriver.Firefox()

 driver.get("https://www.baidu.com")

 time.sleep(3)

 #refresh page

 driver.refresh()

 driver.get("http://cn.bing.com/")

 #back

 driver.back()

 time.sleep(2)

 #forward

 driver.forward()

 #resize window

 driver.set_window_size(540,960)

 time.sleep(2)

 #max window

 driver.maximize_window()

 driver.get_screenshot_as_file(r'snap_shot.jpg')

 #close is for ONLY current winidow

 #driver.close()

 #quit is for all the browser proceses

 driver.quit()