[Bug 1586628] [NEW] Thunderbird should switch to GTK3

[Nikita Yerenkov-Scott]

Public bug reported:

I think that it would be good if Thunderbird got up-to-date with its GTK
look so it would be good if it upgraded from GTK2 to GTK3.

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: Invalid

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https://bugs.launchpad.net/bugs/1586628

Title:
  Thunderbird should switch to GTK3

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