How do i hide url WITHOUT hiding tabs in fullscreen mode (F11)?

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How do i hide url WITHOUT hiding tabs in fullscreen mode (F11)?
Title says it all. I want a fullscreen mode that works exactly like it did in Firefox 4.0.
Repaly
There are some hacky things you can do with the toolbar area in full screen mode. I worked on one recently to keep the Bookmarks Toolbar displayed. Hopefully someone can work out the rules for the tab bar.
That other thread: [https://support.mozilla.org/en-US/questions/956050 How do I show the bookmarks toolbar while in fullscreen on Firefox 20? In older versions you could edit the userChrome.css file. Does that still exist?]
Read More: The other 4 answers