A thunderbird security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: thunderbird-78.10.1-1.fc33

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Fedora Update Notification
FEDORA-2021-8f13872334
2021-05-11 01:15:16.743976
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Name : thunderbird
Product : Fedora 33
Version : 78.10.1
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:

Update to latest upstream version.
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ChangeLog:

* Tue May 4 2021 Jan Horak - 78.10.1-1
- Update to 78.10.1 build1
* Tue Mar 30 2021 Jonathan Wakely - 78.8.1-2
- Rebuilt for removed libstdc++ symbol (#1937698)
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References:

[ 1 ] Bug #1951957 - Thunderbird 78.10.0 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1951957
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-8f13872334' 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