In the menu bar, open the Tools menu (in newer versions this will appear as three dashed lines in the upper right corner)
Select Options
Go to the Security tab (older versions of Firefox will list this as Privacy)
Select Saved Passwords
To eliminate all existing password, select Remove all. To eliminate specific saved passwords, select View Saved Passwords and delete just those associated with the page you're removing. If you wish, deselect the option for Remember passwords - this will prevent passwords from being saved in the future.
Go to the Security tab (older versions of Firefox will list this as Privacy)
Select Saved Passwords
To eliminate all existing password, select Remove all. To eliminate specific saved passwords, select View Saved Passwords and delete just those associated with the page you're removing. If you wish, deselect the option for Remember passwords - this will prevent passwords from being saved in the future.
Note: Keychain Access also has the ability to store passwords for web browsers - you can use the program to delete any unwanted passwords for websites if you are having problems with your web browser.
To view the password, tap the webpage and enter in your phone passcode. To delete select the Edit button and choose Delete for any websites that should be forgotten.
