1. Tap the menu button (either below the screen on some devices or at the top-right corner of the browser) and select Settings (you may need to tap More first) .
2. Tap Clear private data.
3. Put a check mark next to the items you want to clear and then tap Clear data.

1. Tap the menu button (either below the screen on some devices or at the top-right corner of the browser) and select Settings (you may need to tap More first) .
2. Tap Privacy and choose Clear now.
3. Put a check mark next to the items you want to clear and then tap Clear data.

   

Delete data on exit

This option automatically deletes your selected data (bookmarks, browsing or search history, saved passwords, and more) every time you quit Firefox:

1. Tap the menu button (either below the screen on some devices or at the top-right corner of the browser) and select Settings (you may need to tap More first) .
2. Tap Privacy and put a check mark next to Clear private data on exit.
3. In the pop-up window, select the types of information that you'd like to delete each time you quit Firefox, then tap Set.

Firefox will delete your information each time you close it through the Quit option on the menu.