A thunderbird security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: thunderbird-78.3.1-1.fc33

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Fedora Update Notification
FEDORA-2020-f5ba8be492
2020-10-06 14:04:21.152655
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Name : thunderbird
Product : Fedora 33
Version : 78.3.1
Release : 1.fc33
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
* Thu Aug 6 2020 Jan Horak - 68.11.0-1
- Update to 68.11.0 build1
* Sat Aug 1 2020 Fedora Release Engineering - 68.10.0-3
- Second attempt - Rebuilt for
  https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Wed Jul 29 2020 Fedora Release Engineering - 68.10.0-2
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
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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-f5ba8be492' 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