Open the Settings app
Scroll down and tap Safari
Tap Clear History and Website Data
Tap Clear History and Data to confirm
To clear Chrome history, open Chrome
Tap the three dots menu
Tap History
Tap Clear Browsing Data
Select the time range and data types
Tap Clear Browsing Data again to confirm
To clear Firefox history, open Firefox
Tap the menu button
Tap History
Tap Clear Recent History
Choose the time range
Tap Clear Recent History to confirm