可以通过开发工具栏CLI在运行中修改首选项，但与加载图像相比，它可能会带来更高的开销。这是Python示例：
from selenium import webdriverfrom selenium.webdriver.common.action_chains import ActionChains, Keysff = webdriver.Firefox()ff.get('http//<URL>')ac = ActionChains(ff)# SHIFT+F2 opens dev toolbarac.key_down(Keys.SHIFT).send_keys(Keys.F2).key_up(Keys.SHIFT).perform()# command to disable imagesac.send_keys('pref set permissions.default.image 2').perform()ac.send_keys(Keys.ENTER).perform()# command to disable flashac.send_keys('pref set plugin.state.flash 0').perform()ac.send_keys(Keys.ENTER).perform()# disable dev toolbarac.key_down(Keys.SHIFT).send_keys(Keys.F2).key_up(Keys.SHIFT).perform()ac.key_down(Keys.SHIFT).send_keys(Keys.F2).key_up(Keys.SHIFT).perform()# reload the page to confirm there are no images or flashff.refresh()
