A firefox-esr regression update has been released for Debian GNU/Linux 9 LTS to address an issue where the previous package fail to build on the arm64 and armhf architectures.

DLA 2387-2: firefox-esr regression update

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Debian LTS Advisory DLA-2387-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
September 29, 2020   https://wiki.debian.org/LTS
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Package : firefox-esr
Version : 78.3.0esr-1~deb9u2

This update fixes a problem that caused Firefox to fail to build on the
arm64 and armhf architectures.

For Debian 9 stretch, this problem has been fixed in version
78.3.0esr-1~deb9u2.

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/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