The Height for Sidebar add-on enables you to save some space by removing the search box for the History or the Bookmarks toolbars, that you can open in the sidebar.NOTE: The Height for Sidebar add-on is cross-platform and it works on Windows, Linux and Mac OS.Here are some key features of "Height for Sidebar":

Ссылка: https://addons...US/firefox/downloads/file/79657/height_for_side-bar-0.4.3-fx.xpi?confirmed