http://pfpmd7dd5ijt4add2sfi4djsaij4u3ebvnwvyvuj6aeipe2f5llptkid.onion/ui3/chatFrame
Almost all applications need the basics of "open" and "close", etc. so the "File" menu held those. "Cut", "copy", and "paste" were also very common actions, and it was conventional to have an "Edit" menu for that.