Hi zurasha, You can use Forget About This Site to remove everything related to that site included the unwanted logins. All history items (browsing and download history, cookies, cache, active logins, passwords, saved form data, exceptions for cookies, images, pop-ups) for that site will be removed. Boookmarks will be retained. Copy the logins & passwords that you want to use later. Apparently, you now need to be signed in with your Primary Password for this to work thoroughly. See: Remove a single website from your history https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox#w_clear-cookies-and-data-for-a-specific-website