[Bug 861664]

[Fligtar-h]

You don't need to make any changes for that to work with SeaMonkey;
simply installing, removing, or enabling/disabling any add-on and
restarting Firefox will fix the issue.

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https://bugs.launchpad.net/bugs/861664

Title:
  Upgrading Firefox/Thunderbird when an add-on update is waiting to be
  installed hides the add-on

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