Hey, Press the hamburger menu on the top right from there got to 'More Tools' and then 'Customize Toolbar', from there drag home icon to your toolbar and save the changes. After that whenever you press home icon it will take you to the home page. See the article below for detailed info. https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars

Note that some toolbar buttons aren't shown anymore by default useless they had been used. This includes the Home and the Library (bookshelf) and Sidebar buttons and in such a case you need to drag them yourself from the customize palette to the Navigation Toolbar.