A thunderbird security update has been released for Fedora 31.

SECURITY: Fedora 31 Update: thunderbird-78.3.1-1.fc31

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Fedora Update Notification
FEDORA-2020-07c5770aa1
2020-10-20 19:02:39.491550
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Name : thunderbird
Product : Fedora 31
Version : 78.3.1
Release : 1.fc31
URL :   http://www.mozilla.org/projects/thunderbird/
Summary : Mozilla Thunderbird mail/newsgroup client
Description :
Mozilla Thunderbird is a standalone mail and newsgroup client.

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Update Information:

Rebase to latest upstream version.
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ChangeLog:

* Wed Sep 30 2020 Jan Horak - 78.3.1-1
- Update to 78.3.1 build1
* Tue Sep 8 2020 Jan Horak - 68.12.0-1
- Update to 68.12.0 build1
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References:

[ 1 ] Bug #1852658 - thunderbird-78.3.1 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1852658
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-07c5770aa1' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys