Firefox - Display Toolbar in fullscreen mode

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When Firefox is launched in fullscreen mode, the toolbar will be in auto-hide mode. Here is a small tip to permanently display the Toolbar:
  • In the address bar of Firefox, type :
  • about:config
  • Confirm the warning window with the "I'll be careful I promise"
  • In the Filter field type: browser.fullscreen.autohide
  • Double click on the entry to set its value to False.
  • Restart Firefox