[Bug 376715]

[Jporter+bmo]

> Thunderbird 60 drops .xpi support

Where did you hear this? That's not true, and in fact I have a number of
old-style extensions I develop that work just fine in Thunderbird 60+.
However, add-ons will likely need some small updates for TB 60, so
they've been marked as incompatible by default.

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https://bugs.launchpad.net/bugs/376715

Title:
  Thunderbird - feature request - nest in toolbar

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