richb wrote:The F11 hide feature in FF can be modified to hide the titlebar. It hides the menu bar and bookmarks bar as well Type about:config in the address bar and find browser.fullscreen.autohide. Set the value to false. It will persist thorough browser close and reopen. Probably still not what FF 56 and older users are looking for, but a twist on F11.
I have all my maximized application's titlebars hidden with the xfce4-windowck-plugin. It requires that you also go into the Window Manager Tweaks/Accessiblity settings and enable "hide window titles when maximized".