I often run testcafe and then go back to my text editor. However, I notice that when it opens a chrome window, it takes focus away from my current window so I need to click back into it to continue working. This happens even with headless chrome, and also regular firefox and s, but not headless firefox.
It would be nice if the window did not take focus away when it opened. I don't have that issue when running tests with protractor.
I have OS X Sierra and Chrome 62.