A firefox security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: firefox-87.0-2.fc33

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Fedora Update Notification
FEDORA-2021-c504fa63be
2021-03-26 17:52:06.072639
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Name : firefox
Product : Fedora 33
Version : 87.0
Release : 2.fc33
URL :   https://www.mozilla.org/firefox/
Summary : Mozilla Firefox Web browser
Description :
Mozilla Firefox is an open-source web browser, designed for standards
compliance, performance and portability.

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Update Information:

New upstream version (87.0) Release notes are available here -
  https://www.mozilla.org/en-US/firefox/87.0/releasenotes/
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ChangeLog:

* Wed Mar 24 2021 Martin Stransky - 87.0-2
- More test fixes
* Tue Mar 23 2021 Martin Stransky - 87.0-1
- Disabled ARM due to build failures
- Updated to 87.0
* Sat Mar 13 2021 Martin Stransky - 86.0.1-2
- Enabled ARM
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-c504fa63be' 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