1 files changed, 5 insertions, 0 deletions
diff --git a/toolkit/modules/sessionstore/Utils.jsm b/toolkit/modules/sessionstore/Utils.jsm
index 863bca6f5..25b75c71b 100644
--- a/toolkit/modules/sessionstore/Utils.jsm
+++ b/toolkit/modules/sessionstore/Utils.jsm
@@ -16,12 +16,17 @@ Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
 XPCOMUtils.defineLazyServiceGetter(this, "serializationHelper",
                                    "@mozilla.org/network/serialization-helper;1",
                                    "nsISerializationHelper");
+XPCOMUtils.defineLazyGetter(this, "SERIALIZED_SYSTEMPRINCIPAL", function() {
+  return Utils.serializePrincipal(Services.scriptSecurityManager.getSystemPrincipal());
+});
 
 function debug(msg) {
   Services.console.logStringMessage("Utils: " + msg);
 }
 
 this.Utils = Object.freeze({
+  get SERIALIZED_SYSTEMPRINCIPAL() { return SERIALIZED_SYSTEMPRINCIPAL; },
+
   makeURI: function (url) {
     return Services.io.newURI(url, null, null);
   },