firefox-esr - security update

Multiple security issues have been found in the Mozilla Firefox web
browser: Multiple memory safety errors, buffer overflows and other
implementation errors may lead to the execution of arbitrary code or
information disclosure.

For the stable distribution (jessie), these problems have been fixed in
version 45.4.0esr-1~deb8u2.

For the unstable distribution (sid), these problems have been fixed in
version 45.4.0esr-1 of firefox-esr and in version 49.0-1 of firefox.

We recommend that you upgrade your firefox-esr packages.