A firefox security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: firefox-85.0-4.fc33

--------------------------------------------------------------------------------
Fedora Update Notification
FEDORA-2021-750c85601a
2021-01-30 01:53:46.555672
--------------------------------------------------------------------------------

Name : firefox
Product : Fedora 33
Version : 85.0
Release : 4.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.

--------------------------------------------------------------------------------
Update Information:

Fixes startup crash.
--------------------------------------------------------------------------------
ChangeLog:

* Tue Jan 26 2021 Martin Stransky - 85.0-4
- Added fix for mozbz#1679933 - startup crash
* Tue Jan 26 2021 Fedora Release Engineering - 85.0-3
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
--------------------------------------------------------------------------------

This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-750c85601a' 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