If you turned off the toolbar, see menu bar is missing, if you went into full screen mode, press F11 to get out of full screen mode.

Actually, I right clicked in the toolbar and unselected all of the menu toolbar options so the F11 doesn't help me. Any ideas on how to get any of the menu's back?

Thanks again.

You can press the F10 key to make the menu bar appear.
If you are in full screen mode then try to hover the mouse to the top of the screen and if the Navigation toolbar appears then right-click : Exit Full Screen Mode

I think the only way that you'll be able to see what I'm talking about is if you right click in the toolbar menu and unselect all of the menu toolbar options. You'll see that the F11 doesn't fix the problem. I can maximize and minimize the window fine. What I can't figure out how to turn the menu selections back on. I can't even type in a web address because I don't have the address window.

Thanks again.

Read the information that is provided!

This support article linked by TonyE tells you how to fix it.
https://support.mozilla.com/en-US/kb/Menu+bar+is+missing

Pressing F10 as cor-el mentioned does the same thing as hitting the Alt key - it temporarily reveals a hidden Menu bar.

Thank you very much! For whatever reason, it wouldn't respond to either the F10 or the Alt last night. So I shut everything down, restarted it this morning and both the F10 and the Alt operated perfectly.

Thanks again for the help!

The F10 key and Alt won't work if you are on a page with plugins and that plugin has focus.
It should always work with an empty tab or if you otherwise set focus outside that plugin.

That's probably what I was experiencing. Again, thank you very much!