2 firefox in task manager

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You can see that there are still 5 process alive,only 1 process is gone,I do not know why,Can anyone help me?Thanks a lot! I press Ctrl+C in 10 seconds,result like this: Then I wait 10 seconds,everything is fine,6 process is gone,like this: When firefox winodw showed,I notice there are 6 process in task manager,like this

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With this code,there are tow ways to close firefox window: I am using python 3.7 + selenium + geckodriver.exe + firefox 70.0.1圆4,I know driver.quit() could close firefox window,but in some situation I can not quit firefox totally,I do not know why,this is my code: from selenium import webdriver