here's some related terminology..

the line at the very top of your browser screen (this is true of virtually all apps) is called the Title Bar, and gives the title of the web page and app you're dealing with - in our case it reads: Wordsmith Talk - Mozilla Firefox (your browser may vary)

the next line down is the Menu Bar (if enabled), comprising the File / Edit / View / History / Bookmarks / etc. menus.

in an earlier post I suggested experimenting with the right mouse button is various areas - right clicking within the Menu Bar is where you will get the Options to disable the various toolbars, including the Menu Bar itself.