diff --git a/content/base/public/nsContentUtils.h b/content/base/public/nsContentUtils.h
index e46b21a7109..2c0bb08e744 100644
--- a/content/base/public/nsContentUtils.h
+++ b/content/base/public/nsContentUtils.h
@@ -950,6 +950,26 @@ public:
                                        bool aCanBubble,
                                        bool aCancelable,
                                        bool *aDefaultAction = nsnull);
+                                       
+  /**
+   * This method creates and dispatches a untrusted event.
+   * Works only with events which can be created by calling
+   * nsIDOMDocument::CreateEvent() with parameter "Events".
+   * @param aDoc           The document which will be used to create the event.
+   * @param aTarget        The target of the event, should be QIable to
+   *                       nsIDOMEventTarget.
+   * @param aEventName     The name of the event.
+   * @param aCanBubble     Whether the event can bubble.
+   * @param aCancelable    Is the event cancelable.
+   * @param aDefaultAction Set to true if default action should be taken,
+   *                       see nsIDOMEventTarget::DispatchEvent.
+   */
+  static nsresult DispatchUntrustedEvent(nsIDocument* aDoc,
+                                         nsISupports* aTarget,
+                                         const nsAString& aEventName,
+                                         bool aCanBubble,
+                                         bool aCancelable,
+                                         bool *aDefaultAction = nsnull);
 
   /**
    * This method creates and dispatches a trusted event to the chrome
@@ -1945,6 +1965,14 @@ private:
                              const nsIID* aIID, jsval *vp,
                              nsIXPConnectJSObjectHolder** aHolder,
                              bool aAllowWrapping);
+                            
+  static nsresult DispatchEvent(nsIDocument* aDoc,
+                                nsISupports* aTarget,
+                                const nsAString& aEventName,
+                                bool aCanBubble,
+                                bool aCancelable,
+                                bool aTrusted,
+                                bool *aDefaultAction = nsnull);
 
   static void InitializeModifierStrings();
 
diff --git a/content/base/src/nsContentUtils.cpp b/content/base/src/nsContentUtils.cpp
index 22e1efb6bcd..cf0d7a0a8ce 100644
--- a/content/base/src/nsContentUtils.cpp
+++ b/content/base/src/nsContentUtils.cpp
@@ -3072,7 +3072,7 @@ static
 nsresult GetEventAndTarget(nsIDocument* aDoc, nsISupports* aTarget,
                            const nsAString& aEventName,
                            bool aCanBubble, bool aCancelable,
-                           nsIDOMEvent** aEvent,
+                           bool aTrusted, nsIDOMEvent** aEvent,
                            nsIDOMEventTarget** aTargetOut)
 {
   nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aDoc);
@@ -3090,7 +3090,7 @@ nsresult GetEventAndTarget(nsIDocument* aDoc, nsISupports* aTarget,
   rv = event->InitEvent(aEventName, aCanBubble, aCancelable);
   NS_ENSURE_SUCCESS(rv, rv);
 
-  rv = privateEvent->SetTrusted(true);
+  rv = privateEvent->SetTrusted(aTrusted);
   NS_ENSURE_SUCCESS(rv, rv);
 
   rv = privateEvent->SetTarget(target);
@@ -3107,11 +3107,33 @@ nsContentUtils::DispatchTrustedEvent(nsIDocument* aDoc, nsISupports* aTarget,
                                      const nsAString& aEventName,
                                      bool aCanBubble, bool aCancelable,
                                      bool *aDefaultAction)
+{
+  return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable,
+                       true, aDefaultAction);
+}
+
+// static
+nsresult
+nsContentUtils::DispatchUntrustedEvent(nsIDocument* aDoc, nsISupports* aTarget,
+                                       const nsAString& aEventName,
+                                       bool aCanBubble, bool aCancelable,
+                                       bool *aDefaultAction)
+{
+  return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable,
+                       false, aDefaultAction);
+}
+
+// static
+nsresult
+nsContentUtils::DispatchEvent(nsIDocument* aDoc, nsISupports* aTarget,
+                              const nsAString& aEventName,
+                              bool aCanBubble, bool aCancelable,
+                              bool aTrusted, bool *aDefaultAction)
 {
   nsCOMPtr<nsIDOMEvent> event;
   nsCOMPtr<nsIDOMEventTarget> target;
   nsresult rv = GetEventAndTarget(aDoc, aTarget, aEventName, aCanBubble,
-                                  aCancelable, getter_AddRefs(event),
+                                  aCancelable, aTrusted, getter_AddRefs(event),
                                   getter_AddRefs(target));
   NS_ENSURE_SUCCESS(rv, rv);
 
@@ -3130,7 +3152,7 @@ nsContentUtils::DispatchChromeEvent(nsIDocument *aDoc,
   nsCOMPtr<nsIDOMEvent> event;
   nsCOMPtr<nsIDOMEventTarget> target;
   nsresult rv = GetEventAndTarget(aDoc, aTarget, aEventName, aCanBubble,
-                                  aCancelable, getter_AddRefs(event),
+                                  aCancelable, true, getter_AddRefs(event),
                                   getter_AddRefs(target));
   NS_ENSURE_SUCCESS(rv, rv);