diff -up firefox-45.0.1esr/configure.in.nss firefox-45.0.1esr/configure.in

--- firefox-45.0.1esr/configure.in.nss	2016-04-06 10:20:01.000000000 +0200

+++ firefox-45.0.1esr/configure.in	2016-04-06 10:25:56.998285981 +0200

@@ -53,7 +53,7 @@ dnl ====================================

 MOZJPEG=62

 MOZPNG=10619

 NSPR_VERSION=4

-NSPR_MINVER=4.12

+NSPR_MINVER=4.11

 NSS_VERSION=3

 dnl Set the minimum version of toolkit libs used by mozilla

@@ -3451,7 +3451,7 @@ MOZ_ARG_WITH_BOOL(system-nss,

     _USE_SYSTEM_NSS=1 )

 if test -n "$_USE_SYSTEM_NSS"; then

-    AM_PATH_NSS(3.21.1, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])

+    AM_PATH_NSS(3.21.0, [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