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There isn't one. By deafult if you open a new page, or close all the pages, you will be directed to about:home, the start page. You may change the home page in the Settings.
If you really need a home button, then you can use this add-on: https://addons.mozilla.org/hu/android/addon/home-button-for-ff-on-android/
Изменено Balázs Meskó