Hi msetley, Firefox is a web browser. It displays the content of existing sites. Things like email or page contents come from the content provider. Who is your email provider? You'll probably have better luck consulting their help documentation. Have you verified to see if these issues are in Firefox only? I would imagine that the autocomplete field you are referring to is powered by your mail provider, but just in case I would take a look at the [https://support.mozilla.org/en-US/kb/Form-autocomplete auto-complete Knowledge Base article]. Hopefully this helps!