Spawn_Dooley has that suggestion above. I am using version 35.0.1 of Firefox, and in order for me to hide the Toolbar, I have to select, from the View menu, Toolbars > Customize > Show/Hide Toolbars. For version 8.0.3 of Safari that I have (I am running Yosemite (OS 10.10.2)), and once in a while use, I would need to go to the View menu and select Hide Toolbar. To get them back, I would go to the View menu, and select Show Toolbar. Not sure how it would exactly work with your version of Safari. Maybe it's the same.