We're still getting sporadic test failures with BrowserStack. So per one
discussion online, attempting to run without concurrency to see if it
improves stability.
I note that the video from tests where we "fail to capture" shows a
browser with an error: "Safari Can't Connect to the Server" "Safari
can't open the page "localhost:9879/?id=75185158" because Safari can't
connect to the server "localhost".
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