get(url)：打开指定页面
set_window_size(x,y)  ：设置窗口大小
maximize_window()：放大浏览器为全屏模式
minimize_window()   最小化
forward()：前进 
back()：后退
refresh()：页面刷新
close() 关闭窗口
quit()  关闭浏览器

from selenium import webdriver
from time import sleep
driver = webdriver.Firefox()
# driver = webdriver.Chrome()
# from time import sleep
driver.get ('https://www.baidu.com/')
sleep(1)
driver.set_window_size(800,800)
sleep(1)
driver.minimize_window()
sleep(2)
driver.maximize_window()
sleep(2)
driver.forward()
driver.get ('https://hao.360.com/')
sleep(2)
driver.back()
sleep(2)
driver.refresh()
sleep(2)
driver.close()
sleep(2)
driver.quit()
sleep(2)