how do i clear mozilla usb passkey popup

dlcathcart1, this dialogue box might be appearing due to the setting "Require device sign in to fill and manage passwords" being enabled.

See this article for more information, especially the section "Enable or disable password authentication": https://support.mozilla.org/en-US/kb/firefox-password-authentification-prompt

You should look for any options on the site prompting you, to stop expecting the passkey or just go back to username + password. See: https://support.mozilla.org/questions/1583382