Here's a more competent form - a one-key toggle, which doesn't rely on screen position & works regardless of resizing.
#IfWinActive ahk_class Chrome_WidgetWin_0 ; Opera 20 !b:: ; bookmark bar toggle send !p sleep 1000 send book sleep 600 send {tab}{space}^w returnThe 1-second delay, waiting for the settings page to load, isn't always enough; seems to take especially long when one is on this site, for some reason. But no harm is done if it fails.