[Bug 1576605] [NEW] Activating menu items creates permanent space between title bar and tabs

[Oxwivi]

Public bug reported:

This bug applies to all Firefox versions since Unity brought global
menus. However, only Firefox is affected, I've not observed any other
app with a similar issue.

What I expected:
 * Activating a menu item to simply display the relevant menu and cause no further interface changes

What happened instead:
 * Activating a menu item displays the relevant menu and introduces a space between the titlebar and tabs

The change is persistent as long as the window is open. Resizing or
maximizing makes no difference. Enabling and activating menus from the
title bar causes the exact same effect. Closing the window and reopening
it from History's "Restore Closed Windows" removes the space. In other
words, it does not affect newly opened windows.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1576605

Title:
  Activating menu items creates permanent space between title bar and
  tabs

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