If you right-click a toolbar item in normal (non-customize) mode then you can remove this item from the toolbar. * "Remove from Toolbar" will remove this item from the Navigation Toolbar and moves it to the Customize palette ("3-bar" Firefox menu button > Customize) * "Move to Menu" will move this item to the "3-bar" Firefox menu button drop-down list * "Move to Toolbar" in the "3-bar" Firefox menu button drop-down list will move this item to the toolbar See also: *https://support.mozilla.org/kb/customize-firefox-controls-buttons-and-toolbars