Some users accumulate a lot of open tabs over time and do not want to have to manually close them, Firefox for Android can automatically close tabs after one day, one week or one month.

Change your auto-close tab settings

1. Open your Tabs tray by tapping the number next to the address bar, this number shows how many open tabs you have.

   

2. Tap the three-dot menu button in the tabs tray.

   

3. Select Tab settings.
4. Under Close tabs you will see options:

   

5. Tap the selection of how frequently you want your open tabs to automatically close.