diff --git a/suite/browser/navigator.js b/suite/browser/navigator.js
index d66497f86d86..d9701658e616 100644
--- a/suite/browser/navigator.js
+++ b/suite/browser/navigator.js
@@ -212,7 +212,7 @@ const gPopupPrefListener =
 function addPrefListener(observer)
 {
   try {
-    var pbi = pref.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
+    var pbi = pref.QueryInterface(Components.interfaces.nsIPrefBranch2);
     pbi.addObserver(observer.domain, observer, false);
   } catch(ex) {
     dump("Failed to observe prefs: " + ex + "\n");
@@ -222,7 +222,7 @@ function addPrefListener(observer)
 function removePrefListener(observer)
 {
   try {
-    var pbi = pref.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
+    var pbi = pref.QueryInterface(Components.interfaces.nsIPrefBranch2);
     pbi.removeObserver(observer.domain, observer);
   } catch(ex) {
     dump("Failed to remove pref observer: " + ex + "\n");
diff --git a/suite/browser/urlbarBindings.xml b/suite/browser/urlbarBindings.xml
index 61c20922a4de..417f4a1f711c 100644
--- a/suite/browser/urlbarBindings.xml
+++ b/suite/browser/urlbarBindings.xml
@@ -8,7 +8,7 @@
   <binding id="urlbar" extends="chrome://global/content/autocomplete.xml#autocomplete">
     <implementation>
       <constructor><![CDATA[
-        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
+        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranch2);
         if (pbi)
           pbi.addObserver("browser.urlbar", this.mPrefObserver, false);
         
@@ -17,7 +17,7 @@
       ]]></constructor>
 
       <destructor><![CDATA[
-        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
+        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranch2);
         if (pbi)
           pbi.removeObserver("browser.urlbar", this.mPrefObserver);
       ]]></destructor>
@@ -65,7 +65,7 @@
     <implementation>
       <constructor><![CDATA[
         // listen for changes to default search engine
-        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
+        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranch2);
         if (pbi) {
           pbi.addObserver("browser.search", this.mPrefObserver, false);
           pbi.addObserver("browser.urlbar", this.mPrefObserver, false);
@@ -73,7 +73,7 @@
       ]]></constructor>
 
       <destructor><![CDATA[
-        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
+        var pbi = this.mPrefs.QueryInterface(Components.interfaces.nsIPrefBranch2);
         if (pbi) {
           pbi.removeObserver("browser.search", this.mPrefObserver);
           pbi.removeObserver("browser.urlbar", this.mPrefObserver);