Hi, is this a problem with a login that was saved in Firefox, or does the old email appear even without being saved in Lockwise (Firefox's password manager)? To review/edit/delete logins, try the steps in this article: [[Edit or delete a login in Firefox Lockwise on desktop]]. If the old email is suggested even without being a saved login, it could be saved in form history. While you are in that form field, if you start typing the address and Firefox displays it as a suggestion in a drop-down, press the down arrow key to highlight the suggestion and then press Shift+Delete to remove it from form history. More info on form history in this article: [[Control whether Firefox automatically fills in forms]]. And finally, if it doesn't seem that Firefox is filling the address, it could be stored in a Google cookie. Here's how to remove those (assuming you don't have any unsaved work in progress on Google sites): While viewing a page on the site, click the lock icon at the left end of the address bar. After a moment, a "Clear Cookies and Site Data" button should appear at the bottom. Go ahead and click that. In the dialog that opens, you will see one or more matches to the current address so you can remove the site's cookies individually without affecting other sites.