From: Hans Petter Jansson <hpj@copyleft.no>
      Wolfgang Rosenauer <wr@rosenauer.org>
Subject: use libnsssharedhelper if available at compile time
         (can be disabled by exporting MOZ_XRE_NO_NSSHELPER=1)
References:

diff --git a/config/autoconf.mk.in b/config/autoconf.mk.in
--- a/config/autoconf.mk.in
+++ b/config/autoconf.mk.in
@@ -548,16 +548,20 @@ MOZ_ENABLE_LIBNOTIFY	= @MOZ_ENABLE_LIBNO
 
 GLIB_CFLAGS	= @GLIB_CFLAGS@
 GLIB_LIBS	= @GLIB_LIBS@
 GLIB_GMODULE_LIBS	= @GLIB_GMODULE_LIBS@
 LIBIDL_CFLAGS = @LIBIDL_CFLAGS@
 LIBIDL_LIBS = @LIBIDL_LIBS@
 STATIC_LIBIDL = @STATIC_LIBIDL@
 
+MOZ_ENABLE_NSSHELPER = @MOZ_ENABLE_NSSHELPER@
+NSSHELPER_CFLAGS = @NSSHELPER_CFLAGS@
+NSSHELPER_LIBS = @NSSHELPER_LIBS@
+
 MOZ_NATIVE_MAKEDEPEND	= @SYSTEM_MAKEDEPEND@
 
 MOZ_AUTO_DEPS	= @MOZ_AUTO_DEPS@
 COMPILER_DEPEND = @COMPILER_DEPEND@
 MDDEPDIR        := @MDDEPDIR@
 
 MOZ_DEMANGLE_SYMBOLS = @MOZ_DEMANGLE_SYMBOLS@
 
diff --git a/configure.in b/configure.in
--- a/configure.in
+++ b/configure.in
@@ -7756,16 +7756,31 @@ AC_SUBST(MOZ_CAIRO_LIBS)
 
 dnl qcms
 dnl ========================================================
 
 QCMS_LIBS='$(DEPTH)/gfx/qcms/$(LIB_PREFIX)mozqcms.$(LIB_SUFFIX)'
 AC_SUBST(QCMS_LIBS)
 
 dnl ========================================================
+dnl Check for nss-shared-helper
+dnl ========================================================
+
+  PKG_CHECK_MODULES(NSSHELPER, nss-shared-helper, 
+   [MOZ_ENABLE_NSSHELPER=1],
+   [MOZ_ENABLE_NSSHELPER=])
+
+if test "$MOZ_ENABLE_NSSHELPER"; then
+  AC_DEFINE(MOZ_ENABLE_NSSHELPER)
+fi
+AC_SUBST(MOZ_ENABLE_NSSHELPER)
+AC_SUBST(NSSHELPER_CFLAGS)
+AC_SUBST(NSSHELPER_LIBS)
+
+dnl ========================================================
 dnl disable xul
 dnl ========================================================
 MOZ_ARG_DISABLE_BOOL(xul,
 [  --disable-xul           Disable XUL],
     MOZ_XUL= )
 if test "$MOZ_XUL"; then
   AC_DEFINE(MOZ_XUL)
 else
diff --git a/security/manager/ssl/src/Makefile.in b/security/manager/ssl/src/Makefile.in
--- a/security/manager/ssl/src/Makefile.in
+++ b/security/manager/ssl/src/Makefile.in
@@ -133,19 +133,20 @@ REQUIRES	= nspr \
 		  $(NULL)
 
 EXTRA_DEPS = $(NSS_DEP_LIBS)
 
 DEFINES += -DNSS_ENABLE_ECC
 
 # Use local includes because they are inserted before INCLUDES
 # so that Mozilla's nss.h is used, not glibc's
-LOCAL_INCLUDES += $(NSS_CFLAGS)
+LOCAL_INCLUDES += $(NSS_CFLAGS) $(NSSHELPER_CFLAGS)
 
 EXTRA_DSO_LDOPTS += \
 		$(MOZ_UNICHARUTIL_LIBS) \
 		$(MOZ_COMPONENT_LIBS) \
 		$(MOZ_JS_LIBS) \
+		$(NSSHELPER_LIBS) \
 		$(NSS_LIBS) \
 		$(NULL)
 
 include $(topsrcdir)/config/rules.mk
 
diff --git a/security/manager/ssl/src/nsNSSComponent.cpp b/security/manager/ssl/src/nsNSSComponent.cpp
--- a/security/manager/ssl/src/nsNSSComponent.cpp
+++ b/security/manager/ssl/src/nsNSSComponent.cpp
@@ -39,16 +39,23 @@
  * use your version of this file under the terms of the MPL, indicate your
  * decision by deleting the provisions above and replace them with the notice
  * and other provisions required by the GPL or the LGPL. If you do not delete
  * the provisions above, a recipient may use your version of this file under
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */
 
+#ifdef MOZ_ENABLE_NSSHELPER
+#pragma GCC visibility push(default)
+#include <nss-shared-helper.h>
+#pragma GCC visibility pop
+#include "prenv.h"
+#endif
+
 #include "nsNSSComponent.h"
 #include "nsNSSCallbacks.h"
 #include "nsNSSIOLayer.h"
 #include "nsSSLThread.h"
 #include "nsCertVerificationThread.h"
 
 #include "nsNetUtil.h"
 #include "nsAppDirectoryServiceDefs.h"
@@ -1600,17 +1607,31 @@ nsNSSComponent::InitializeNSS(PRBool sho
     // The call to ConfigureInternalPKCS11Token needs to be done before NSS is initialized, 
     // but affects only static data.
     // If we could assume i18n will not change between profiles, one call per application
     // run were sufficient. As I can't predict what happens in the future, let's repeat
     // this call for every re-init of NSS.
 
     ConfigureInternalPKCS11Token();
 
-    SECStatus init_rv = ::NSS_InitReadWrite(profileStr.get());
+    SECStatus init_rv = SECFailure;
+#ifdef MOZ_ENABLE_NSSHELPER
+    if (PR_GetEnv("MOZ_XRE_NO_NSSHELPER")) {
+      init_rv = ::NSS_InitReadWrite(profileStr.get());
+    } else {
+      init_rv = ::nsshelp_open_db ("mozilla-xul", profileStr.get(), 0);
+
+      if (init_rv != SECSuccess) {
+        PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("can not init NSS using nsshelp_open_db in %s\n", profileStr.get()));
+        init_rv = ::NSS_InitReadWrite(profileStr.get());
+      }
+    }
+#else
+    init_rv = ::NSS_InitReadWrite(profileStr.get());
+#endif
 
     if (init_rv != SECSuccess) {
       PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("can not init NSS r/w in %s\n", profileStr.get()));
 
       if (supress_warning_preference) {
         which_nss_problem = problem_none;
       }
       else {
diff --git a/toolkit/library/Makefile.in b/toolkit/library/Makefile.in
--- a/toolkit/library/Makefile.in
+++ b/toolkit/library/Makefile.in
@@ -189,17 +189,17 @@ else
 EXTRA_DSO_LDOPTS += \
 	$(MOZ_COMPONENT_LIBS) \
 	$(MOZ_JS_LIBS) \
 	$(NULL)
 endif
 
 DEFINES += -DIMPL_XREAPI
 
-EXTRA_DSO_LDOPTS += $(NSPR_LIBS)
+EXTRA_DSO_LDOPTS += $(NSPR_LIBS) $(NSSHELPER_LIBS)
 
 ifeq ($(MOZ_WIDGET_TOOLKIT),cocoa)
 CXXFLAGS	+= $(TK_CFLAGS)
 EXTRA_DSO_LDOPTS += \
 	-framework SystemConfiguration \
 	-framework QuickTime \
 	-framework IOKit \
 	-lcrypto \