[Python] Selenium leaves behind running processes?

When my selenium program crashes due to some error, it seems to leave behind running processes.

For example, here is my process list:

carol 30186 0.0 0.0 103576 7196 pts/11 Sl 00:45 0:00 /home/carol/test/chromedriver --port=51789
carol 30322 0.0 0.0 102552 7160 pts/11 Sl 00:45 0:00 /home/carol/test/chromedriver --port=33409
carol 30543 0.0 0.0 102552 7104 pts/11 Sl 00:48 0:00 /home/carol/test/chromedriver --port=42567
carol 30698 0.0 0.0 102552 7236 pts/11 Sl 00:50 0:00 /home/carol/test/chromedriver --port=46590
carol 30938 0.0 0.0 102552 7496 pts/11 Sl 00:55 0:00 /home/carol/test/chromedriver --port=51930
carol 31546 0.0 0.0 102552 7376 pts/11 Sl 01:16 0:00 /home/carol/test/chromedriver --port=53077
carol 31549 0.5 0.0 0 0 pts/11 Z 01:16 0:03 [chrome] <defunct>
carol 31738 0.0 0.0 102552 7388 pts/11 Sl 01:17 0:00 /home/carol/test/chromedriver --port=55414
carol 31741 0.3 0.0 0 0 pts/11 Z 01:17 0:02 [chrome] <defunct>
carol 31903 0.0 0.0 102552 7368 pts/11 Sl 01:19 0:00 /home/carol/test/chromedriver --port=54205
carol 31906 0.6 0.0 0 0 pts/11 Z 01:19 0:03 [chrome] <defunct>
carol 32083 0.0 0.0 102552 7292 pts/11 Sl 01:20 0:00 /home/carol/test/chromedriver --port=39083
carol 32440 0.0 0.0 102552 7412 pts/11 Sl 01:24 0:00 /home/carol/test/chromedriver --port=34326
carol 32443 1.7 0.0 0 0 pts/11 Z 01:24 0:03 [chrome] <defunct>
carol 32691 0.1 0.0 102552 7360 pts/11 Sl 01:26 0:00 /home/carol/test/chromedriver --port=36369
carol 32695 2.8 0.0 0 0 pts/11 Z 01:26 0:02 [chrome] <defunct>


Here is my code:

from selenium import webdriver

browser = webdriver.Chrome("path/to/chromedriver")
browser.get("http://stackoverflow.com")
browser.find_element_by_id('...').click()

browser.close()


Sometimes, the browser doesn't load the webpage elements quickly enough so Selenium crashes when it tries to click on something it didn't find. Other times it works fine.

This is a simple example for simplicity sake, but with a more complex selenium program, what is a guaranteed clean way of exiting and not leave behind running processes? It should cleanly exit on an unexpected crash and on a successful run.

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