Firefox navigation bar at the bottom

@notone,

There is a way via userChrome.css styling. Not that pretty, but it works.

You can try the following steps:

  1. Navigate to about:support
  2. Open your Profile Directory
  3. Create a folder named chrome, if it do not exists
  4. Create a file userChrome.css
  5. Open about:config
  6. Change toolkit.legacyUserProfileCustomizations.stylesheets to true
  7. Close FireFox
  8. Paste this into the userChrome.css
@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

#browser {
	-moz-box-ordinal-group: 0 !important;
	padding-top: 1px;
}

#nav-bar[inFullscreen],
#TabsToolbar[inFullscreen] {
	display: none;
}
  1. Start Firefox and Voila!
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