[Bug 1850780] [NEW] Right click often activates the first action

[Corentin Noël]

Public bug reported:

I'm having an issue on elementary OS (based on Ubuntu 18.04) every time
that I right click, I also activate the right click menu. setting
`ui.context_menus.after_mouseup` to true in about:config seems to fix
the issue for me.

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

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Title:
  Right click often activates the first action

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