In case you ever wondered, you cannot test extensions with Selenium and headless Chrome. Chrome does not support this type of testing.
options = webdriver.ChromeOptions()
# print(dir(options))
# see this https://stackoverflow.com/questions/45372066/is-it-possible-to-run-google-chrome-in-headless-mode-with-extensions
# you cannot test extensions if you are in headless mode?
# it is a bug
options.add_argument('headless')
But the good news you can load an extension with Selenium easy-peasy. As long as you are not headless.
options.add_argument("--load-extension={0}".format("e:/projects/headless/myext"))
Another thing I found at least in Windows 10 with this version of chromedriver
ChromeDriver 75.0.3770.140 (2d9f97485c7b07dc18a74666574f19176731995c-refs/branch-heads/3770@{#1155})
I would get a errant chromedriver.exe process that hung around after each test (I was using the Python bindings).
To fix that I switched to using webdriver.Remote and ran the chromedriver.exe by hand only one time.
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