diff -up firefox-31.1.0/mozilla-esr31/configure.in.nss-3.16.2 firefox-31.1.0/mozilla-esr31/configure.in
--- firefox-31.1.0/mozilla-esr31/configure.in.nss-3.16.2	2014-09-10 10:30:03.958056094 +0200
+++ firefox-31.1.0/mozilla-esr31/configure.in	2014-09-10 10:30:04.073055533 +0200
@@ -3655,7 +3655,7 @@ MOZ_ARG_WITH_BOOL(system-nss,
     _USE_SYSTEM_NSS=1 )
 
 if test -n "$_USE_SYSTEM_NSS"; then
-    AM_PATH_NSS(3.16.2, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
+    AM_PATH_NSS(3.16.1, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
 fi
 
 if test -n "$MOZ_NATIVE_NSS"; then
diff -up firefox-31.1.0/mozilla-esr31/configure.nss-3.16.2 firefox-31.1.0/mozilla-esr31/configure
--- firefox-31.1.0/mozilla-esr31/configure.nss-3.16.2	2014-09-10 10:30:03.000000000 +0200
+++ firefox-31.1.0/mozilla-esr31/configure	2014-09-10 10:31:46.874554100 +0200
@@ -15222,7 +15222,7 @@ else
   echo "$ac_t""no" 1>&6
 fi
 
-	min_nss_version=3.16.2
+	min_nss_version=3.16.1
 	echo $ac_n "checking for NSS - version >= $min_nss_version""... $ac_c" 1>&6
 echo "configure:15228: checking for NSS - version >= $min_nss_version" >&5