1. Right click on the bar and select "Customize..."
2. The customize menu will open up and on the bottom left there "Titlebar"
3. Click on that and make sure Bookmark Toolbar is checked
4. It will appear and you can now drag and drop it into the all in one toolbar space(see image)

Appreciate that and the image! It appears that I can "move" the bookmark tool bar itself over to the all in one though it doesnt function the same as the normal bookmarks. But it literaly moves the whole thing there when I just want it to show in the sidebar like my normal bookmarks do.

I was able to pull another bookmark icon over which shows the bookmark toolbar. It does a popup box with it which is still not what I was after but its better than nothing. Ü

Is this like the "Bookmark Toolbar folder" that shows up in the Bookmarks toolbar by default if you hit CTRL + B, however it looks like you are talking about the actual Bookmarks Menu when you click on the Menu bar > Bookmarks and you can see all the folders. In this menu I can also see the Bookmarks toolbar folder (it has a blue star in the middle of the icon and I do not see this in your previous screenshot. )

After not figuring it out I came up with a work around. I added a subfolder to the "Bookmarks Toolbar Folder" and put everything in this folder to add a new layer. This created only one folder to show up in the toolbar on the left.

I started messing around with it trying to do what you had done... and it worked though I'm not sure if its the exact thing. I opened my bookmark ui from the FF top menu Bookmarks/Show All Bookmarks. Then I tried dragging the Bookmarks Toolbar that shows there over to my side bar but within my regular bookmarks. They moved flawlessly and they also sync up to my bookmark toolbar on top. So when an item is changed on either one it changes on the other.

Thank you so much! Nancy