A firefox security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: firefox-91.0-1.fc34

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Fedora Update Notification
FEDORA-2021-63aac3b79c
2021-08-17 01:21:13.331748
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Name : firefox
Product : Fedora 34
Version : 91.0
Release : 1.fc34
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:

Updated to new upstream (91.0)
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ChangeLog:

* Tue Aug 10 2021 Martin Stransky - 91.0-1
- Updated to 91.0
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-63aac3b79c' 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