[Bug 1856877] [NEW] [firefox 72 beta] Unity global menu: opening a menu makes a duplicate menubar appear in the window

[Olivier Tilloy]

Public bug reported:

This is a regression observed in firefox 72.0 beta builds
(https://launchpad.net/~mozillateam/+archive/ubuntu/firefox-next).

In a 16.04 VM with the default Unity session, a menubar is displayed in
the top panel. As soon as I click on one of the menus to open it, a
second, identical, menubar appears in the window, below the titlebar,
thus resizing the web content. After opening a menu in that second
menubar and closing it, it disappears again.

See the attached screenshot.

** Affects: firefox (Ubuntu)
     Importance: High
     Assignee: Olivier Tilloy (osomon)
         Status: Triaged

** Attachment added: "VirtualBox_xenial amd64_18_12_2019_18_24_35.png"
   https://bugs.launchpad.net/bugs/1856877/+attachment/5313683/+files/VirtualBox_xenial%20amd64_18_12_2019_18_24_35.png

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Title:
  [firefox 72 beta] Unity global menu: opening a menu makes a duplicate
  menubar appear in the window

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