TUTORIAL SOMEWHAT IRRELEVANT NOW
Edited 08/10/2022
While it is still possible to customize the toolbar area, it doesn't appear possible to add any number of additional toolbars like it used to be. Also, to customize the toolbar area, just right click the header over any area without a clickable button and select Customize Toolbar.
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Awhile back I started using the Classic Theme Restorer (NO LONGER AVAILABLE) add-on with Firefox so that I could bring back the footer area as well as customize certain things that were no longer doable in Firefox itself. And I honestly thought that even without that add-on you could add more toolbars. I found out that that wasn't the case when I was using my sister's laptop one day. So to customize the number of toolbars on your browser, you will need to add the Classic Theme Restorer add-on to Firefox.* From there, it's pretty simple and I've included some print screens below to show you how.
Once Classic Theme Restorer is installed, click on the menu button.
Then click on CUSTOMIZE from the menu that pops up.
At the bottom of the screen you will see an ADDITIONAL TOOLBAR button to the left of the green Exit Customize button. Click on that.







