[Bug 1265898]

[Najoll]

I have found a workaround for the problem.

The workaround may suggest where the problem lies.

The workaround is: disable drawing on tabs in titlebar; maximise the
main window; close Thunderbird; re-enable drawing of tabs in titlebar.
Result: Thunderbird will now open maximised.

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https://bugs.launchpad.net/bugs/1265898

Title:
  thunderbird doesn't remember maximized window state in Ubuntu Gnome

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