[Bug 1859123] [NEW] No global menus (panel-appmenu / dbus) in Firefox 72.0.1

[Matt Mayfield]

Public bug reported:

No global menus are displayed in latest Firefox 72.0.1 (possibly in a
slightly earlier version).

This issue was observed on three different systems all running Ubuntu
MATE 20.04 Focal (development), and I first noticed it on each system
upon updating to 72.0.1 today.

The symptoms are identical to https://bugs.launchpad.net/ubuntu-
mate/+bug/1743687 , but running `env UBUNTU_MENUPROXY=0 firefox` does
not resolve the issue. `env UBUNTU_MENUPROXY=1 firefox` does not resolve
the issue either.

My first guess is that the issue is a change in Firefox, due to how the
previous solution with the environment variable no longer works.
(Perhaps a change to the Unity menu patch?)

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

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Title:
  No global menus (panel-appmenu / dbus) in Firefox 72.0.1

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