Multiple security issues have been found in the Mozilla Firefox web browser, which could result in the execution of arbitrary code, privilege escalation or information disclosure.
For the stable distribution (stretch), these problems have been fixed in version 60.3.0esr-1~deb9u1.
We recommend that you upgrade your firefox-esr packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/