代码如下(网上示例)：
#profile = webdriver.FirefoxProfile(r"C:UsersSkyyjAppDataRoamingMozillaFirefoxProfiles1rzh6139.default")
profile = webdriver.FirefoxProfile()
##设置成0代表下载到浏览器默认下载路径；设置成2则可以保存到指定目录
profile.set_preference("browser.download.folderList", 2)
#这里设置与否不影响，没有发现有什么影响。
#profile.set_preference("browser.download.manager.showWhenStarting", False)
profile.set_preference("browser.download.dir", r"c:Down")
profile.set_preference("browser.helperApps.neverAsk.saveToDisk", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
#这里设置与否没有发现有什么影响
#profile.set_preference("browser.helperApps.alwaysAsk.force", False);
self.driver = webdriver.Firefox(profile)
自己写的实例(Environment:Python3.6.5+Selenium+PyCharm+Firefox61+FirefoxDriver)：
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
import time,os
profile = webdriver.FirefoxProfile()
#save the file to directory=E:sliCIFS2
profile.set_preference("browser.download.dir", r"E:sliCIFS2")
profile.set_preference("browser.download.folderList", 2)
profile.set_preference("browser.download.manager.showWhenStarting", False)
#download .zip file
profile.set_preference("browser.helperApps.neverAsk.saveToDisk", "application/zip")
#driver = webdriver.Firefox(firefox_profile=profile)
driver = webdriver.Firefox(profile)
driver.get("http://10.49.5.8:8080/RLink/login.jsp")
driver.maximize_window()
# -----------------------------------Login Steps----------------------------------------------
# input user name
driver.find_element_by_id("j_username").send_keys("1")
time.sleep(1)
# input password
driver.find_element_by_id("j_password").send_keys("1")
time.sleep(1)
# click "Log in" button
driver.find_element_by_id("buttonSubmit").click()
time.sleep(1)
# -----------------------------------Download Steps----------------------------------------------
# Highlight a zip file by xpath
driver.find_element_by_xpath("/html/body/div[6]/div[2]/div/div[7]/div/div/div[3]/div/div[4]/div/div[4]/div/div/div/div/div/ul/li[10]/div/table/tbody/tr[1]/td/div/div/div/table/tbody/tr/td/div/div/img").click()
time.sleep(2)
# click "Download" button
driver.find_element_by_xpath("/html/body/div[6]/div[2]/div/div[5]/div/table/tbody/tr/td[1]/table/tbody/tr/td[2]/div/table/tbody/tr/td[2]/table/tbody/tr[2]/td/div").click()
time.sleep(2)
# -----------------------------------Logout Steps----------------------------------------------
# click "下拉框" of user menu
driver.find_element_by_xpath('/html/body/div[6]/div[2]/div/div[5]/div/table/tbody/tr/td[2]/table/tbody/tr/td/div/table/tbody/tr/td[2]/table/tbody/tr/td[2]/img').click()
time.sleep(1)
# click "Log Out"
driver.find_element_by_xpath("//div[text()='Log Out']").click()
time.sleep(1)
# click "Yes" on confirm dialog
driver.find_element_by_xpath('/html/body/div[9]/div/div/div/div[3]/div/div[2]/button[1]').click()
# click "No" on confirm dialog
#driver.find_element_by_xpath('/html/body/div[9]/div/div/div/div[3]/div/div[2]/button[2]').click()
time.sleep(1)
driver.quit()