diff --git a/xpfe/appshell/public/nsIAppShellService.idl b/xpfe/appshell/public/nsIAppShellService.idl
index 7a2fa8c67495..206713df0e44 100644
--- a/xpfe/appshell/public/nsIAppShellService.idl
+++ b/xpfe/appshell/public/nsIAppShellService.idl
@@ -17,7 +17,7 @@ interface nsIAppShell;
 #include "js/TypeDecls.h"
 %}
 
-[scriptable, uuid(5c19ab54-67bf-46d0-ac5b-21abd9050c3b)]
+[scriptable, uuid(3927a495-575a-4a12-b9ab-6b948f76ec1f)]
 interface nsIAppShellService : nsISupports
 {
   /**
@@ -44,7 +44,13 @@ interface nsIAppShellService : nsISupports
                                     in long aInitialWidth,
                                     in long aInitialHeight);
 
-  nsIWebNavigation createWindowlessBrowser();
+  /**
+   * This is the constructor for creating an invisible DocShell.
+   * It is used to simulate DOM windows without an actual physical
+   * representation.
+   * @param aIsChrome Set true if you want to use it for chrome content.
+   */
+  nsIWebNavigation createWindowlessBrowser([optional] in bool aIsChrome);
 
   [noscript]
   void createHiddenWindow();
diff --git a/xpfe/appshell/src/nsAppShellService.cpp b/xpfe/appshell/src/nsAppShellService.cpp
index baf00b4387cc..304b749d011f 100644
--- a/xpfe/appshell/src/nsAppShellService.cpp
+++ b/xpfe/appshell/src/nsAppShellService.cpp
@@ -348,7 +348,7 @@ NS_IMPL_RELEASE(WindowlessBrowserStub)
 
 
 NS_IMETHODIMP
-nsAppShellService::CreateWindowlessBrowser(nsIWebNavigation **aResult)
+nsAppShellService::CreateWindowlessBrowser(bool aIsChrome, nsIWebNavigation **aResult)
 {
   /* First, we create an instance of nsWebBrowser. Instances of this class have
    * an associated doc shell, which is what we're interested in.
@@ -374,7 +374,8 @@ nsAppShellService::CreateWindowlessBrowser(nsIWebNavigation **aResult)
   nsCOMPtr<nsIWebNavigation> navigation = do_QueryInterface(browser);
 
   nsCOMPtr<nsIDocShellTreeItem> item = do_QueryInterface(navigation);
-  item->SetItemType(nsIDocShellTreeItem::typeContentWrapper);
+  item->SetItemType(aIsChrome ? nsIDocShellTreeItem::typeChromeWrapper
+                              : nsIDocShellTreeItem::typeContentWrapper);
 
   /* A windowless web browser doesn't have an associated OS level window. To
    * accomplish this, we initialize the window associated with our instance of