UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3187.1 Safari/537.36

Steps to reproduce the problem:
1. drag an existing tab out into a new window

What is the expected behavior?
tab becomes a new window

What went wrong?
new tab window doesn't reset to a single tab layout

browser UI becomes unresponsive

Did this work before? Yes 

Chrome version: 62.0.3187.1  Channel: canary
OS Version: 10.0
Flash Version: