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 NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.