Ditto! Firefox 102.0.1 (64-bit) on Windows 10 Pro (64-bit) with all updates applied.
1) Hit [F11] to get Firefox full-screen
2) Move the mouse cursor to the top of the screen and the top bar (sans the Bookmarks) that disappeared when I hit [F11] suddenly reappears.
How to Start Firefox Without the Add-Ons. Add-ons in Mozilla Firefox automate a wide variety of tasks and enhance the functionality of the Web browser. Too many Firefox add-ons slow the browser dow, however. Add-ons also occasionally limit the functionality of websites or even block websites...
Okay, then try clicking Firefox's Hamburger Menu (three stacked horizontal lines) over on the right, then Help > Troubleshoot Mode > then click the blue Restart button on the pop-up that looks like this:
And yet another way is when you don't see the File Menu at the top, press [Alt][H] to bring the Menu up with "Help" highlighted, then hit [M] for "Troubleshoot Mode".
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