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