Business Insider

How to delete saved passwords on your Mac computer, either one-by-one or all at once

You can delete saved passwords on a Mac by opening the Keychain Access app. Any password that's used to access an application on your Mac can be saved to Keychain ...
Business Insider

How to delete your saved passwords on a Firefox browser, so no one can log in using your data

You can delete saved passwords on Firefox at any time via the "Privacy & Security" menu. You may want to delete passwords from Firefox if they're no longer relevant ...