To clear just cookies, install the Cleary add-on https://addons.mozilla.org/en-US/mobile/addon/cleary Then in the details section, choose "Passwords"

Where do you find the details section?? Do you have to open Firefox and then do something or is it in my settings?

Hi,

After you have the Cleary add-on installed, you should open Firefox then swipe left to and tap the gear button at the bottom right.

The preferences will open and there should be a Clear private data item. When you tap it, you'll see four buttons (I think this is the details section verdi was referring to in his reply) and one will clear your passwords.

Thanks, Michelle

Awesome. Thank you to you both!

This worked.