Once the drop-down appears, you should be able to remove them this way: On the keyboard, press the down arrow key to highlight the unwanted item, then on the keyboard press * Mac: Shift+Delete * Windows: Delete Repeat for the second one you want to delete. There's an extension that allows you to do more extensive cleanup of saved form entries: https://addons.mozilla.org/firefox/addon/form-history-control/ ''Note: some reviewers of the extension criticized its feature of saving form information as you go, which may not be as good as those reviewers would like, but the data deletion feature should work fine.''