UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Steps to reproduce the problem:
1. Quit Chrome
2. Restart Mac
3. 

What is the expected behavior?
Chrome is not supposed to stay open

What went wrong?
Chrome was open but on the new tab page. I believe it is because of an extension that runs in the background so it would be nice to have this policy for Mac as well.

Did this work before? N/A 

Chrome version: 63.0.3239.132  Channel: stable
OS Version: OS X 10.13.2
Flash Version: