I was working on multiple tabs and needed to access something in my history.
I clicked the URL bar, typed on my search term.
Dropdown located what I was looking for (yay)
Dropdown was unclickable (boo)
Dropdown would not go away (double boo)
Dropdown prevented anything under it from being clicked, dragged, opened, closed, or focused on (mo boo)
Ended up having to close the browser.
NOTE: I was accessing something on google docs when this happened.
NOTE 2: I was able to lock another browser up while trying to access this doc.