Thank you for reporting this. It appears there's an extension that does
this already that's mentioned in the upstream bug. The hope is
eventually it will be included in Thunderbird itself. Please report any
other issues you may find.
** Bug watch added: Mozilla Bugzilla #570815
https://bugzi
** Attachment added: "screenshot of the UI regression"
https://bugs.launchpad.net/bugs/691380/+attachment/1768281/+files/TB%203.1.7%20ui%20regression.png
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