diff -up firefox-52.0esr/old-configure.in.nss-ver firefox-52.0esr/old-configure.in

--- firefox-52.0esr/old-configure.in.nss-ver	2017-03-01 10:12:54.668047060 +0100

+++ firefox-52.0esr/old-configure.in	2017-03-01 10:13:01.733044933 +0100

@@ -2123,7 +2123,7 @@ MOZ_ARG_WITH_BOOL(system-nss,

     _USE_SYSTEM_NSS=1 )

 if test -n "$_USE_SYSTEM_NSS"; then

-    AM_PATH_NSS(3.28.6, [MOZ_SYSTEM_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])

+    AM_PATH_NSS(3.28.4, [MOZ_SYSTEM_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])

 fi

 if test -n "$MOZ_SYSTEM_NSS"; then