tom alderson says to YSITD https://www.google.com.tw/url?sa=t&source=web&rct=j&url=https://addons.mozilla.org/en-US/firefox/addon/hide-caption-titlebar-plus-sma/&ved=0ahUKEwjn6MbQxMHUAhUCkpQKHaY_B7sQFggfMAI&usg=AFQjCNFwwM9SwJ0xrdkO9KBac35qybX4iw