In Firefox, I did View=>Toolbars, and UNchecked the box for the main toolbar -- the one that lets you File, Edit, View, Bookmarks, etc.

Now I do not know how to make that toolbar visible again.

Go to the top of your screen where the toolbar would normally be (the beige area or whatever color you set it for), RIGHT CLICK to get a short list of options that show up in a small window, and check whichever menu items you want.

Did that work??

No, it didn't. I get a window w/ Tab options, but nothing about bookmarks when I do it on the Firefox tab, and Restore, Minimize, Maximize, Move, Size, and Close on the Firefox bar. But thanks for trying. 8^)

Right-click just above the location bar (where web addresses appear), you should get the menu as mentioned by Wondergirl. Here's a screen shot:

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No, it didn't. I get a window w/ Tab options, but nothing about bookmarks when I do it on the Firefox tab, and Restore, Minimize, Maximize, Move, Size, and Close on the Firefox bar. But thanks for trying. 8^)
Did you try right-clicking in various places at the top of your screen? I get that tab thing too when I right-click in the row where tabs show up. Try higher up. Do you still have the Navigation and/or Bookmarks toolbar showing? Click in that row.

@NeedKarma -- I can't tell where you mean. I have tried clicking on every bar that is at the top of my screen, and I do not get that window. All I get is the one with Restore, Minimize, Maximize, Move, Size, and Close.

@Wondergirl -- yes, I've tried clicking in almost every spot available on all bars. No, I don't have the Navigation toolbar -- that is the one I'm trying to get back.

LOL! I found a sure fire way:
Press the "Alt" to view a hidden Menu bar then select View > Toolbars

GOD BLESS YOU!! YOU, YOUR CHILDREN (IF ANY), YOUR PETS, YOUR PARENTS, EVERYONE YOU EVER MET...
Thank you, thank you, thank you, thank you!!

I'm glad you're happy. :)

LOL! I found a sure fire way:
press the "Alt" to view a hidden Menu bar then select View > Toolbars
I'll have to remember that since this question comes up every now and then. Make a sticky?

LOL! I know, that may have seemed a little over the top, but I've been frustrated by it for HOURS & HOURS & HOURS! You are a life-saver!

I guess I could whip an FAQ about Firefox as a sticky. Maybe in the next coming days, and I'll post it as a new "question" and the powers that be can make it a sticky if they wish.