[Bug 1786796] [NEW] click on menu button doesn't work with firefox 61

[alteo_gange]

Public bug reported:

I can't click on several icons with Firefox 61 on Ubuntu 16.04 (Xenial).
For example, a click on the menu button doesn't work. None comboboxs work.

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

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Title:
  click on menu button doesn't work with firefox 61

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