Debian follows the extended support releases (ESR) of Firefox.
Starting with this update we're now following the 128.x releases.
Between 115.x and 128.x, Firefox has seen a number of feature
updates. For more information please refer to
https://www.firefox.com/en-US/firefox/128.0esr/releasenotes/?redirect_source=mozilla-org
For Debian 11 bullseye, these problems have been fixed in version
128.3.0esr-1~deb11u2.
We recommend that you upgrade your firefox-esr packages.
For the detailed security status of firefox-esr please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/firefox-esr
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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