From Mibbit Wiki
"Menu" may refer to:
- The menu on the nicknames of the userlist (see also User menu).
- This menu opens if you click a nick and provides often used user related commands like /whois, /ban, /ignore etc. Customized commands or just text phrases can be added in Pref(erence)s -> User list -> User Menus.
- The Menu button/link above or below the user list.
- Same as above, just not user related. Customizing is possible in Pref(erence)s -> Chat window -> Channel Menus.