On Android 4 and above, Firefox doesn't have a Quit option in the menu. We'll show you how to add this with an add-on.
Your Firefox menu will now have a Quit menu item that allows you to exit Firefox for Android.
The Quit option on Firefox for Android lets you close all of your open tabs at once. This option will also automatically clear your browsing history if you've activated this setting.
First, add the Quit option to the menu by setting Firefox to clear your data on exit:
If you don't see the Quit option, you might need to scroll further down the menu first.