[Bug 861664]

[A-geek]

They are not visible in the addons manager. I've reinstalled most of
them in the meantime because I needed them, but they were present in the
addons.sqlite file. For those that I didn't reinstall yet, they are not
listed under "Extensions" on "about:support". They have also been
removed from the extensions subdir of the profile, as a cursory look
indicates, but are (were?) still present in addons.sqlite.

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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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