The update shipped in DSA 3928-1 failed to build on the mips, mipsel and powerpc architectures for the oldstable distribution (jessie). This has been fixed in 52.3.0esr-1~deb8u2.
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/