I can't restore my toolbars and the "full screen" mode button is NOT at the top right-hand corner of my browser (or anywhere else)

My toolbar and menu is gone from Firefox. I have tried closing the browser and opening new ones and all the suggestions in the help forums on this website (as well as several others). Pressing "alt", "F10", "F11" and SEVERAL other things have NOT helped.
There is no full screen mode button anywhere on my browser and when I put my cursor at the top of the window, NO menu options appear at all.
I normally would quit Firefox but the icon won't appear in my dock and my computer won't let me eject the application (to download again) because apparently it's in use (even when I've closed all windows).

F11 doesn't work on a Mac to toggle full screen mode.
Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).
*https://support.mozilla.org/kb/how-to-use-full-screen

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