Press ≡ -> Customize and drag your home to the proper place.

You may have accidentally removed button(s) from the Navigation Toolbar. 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 *https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars *https://support.mozilla.org/en-US/kb/navigation-buttons-missing