diff --git a/suite/common/pref/pref-applications-edit.xul b/suite/common/pref/pref-applications-edit.xul
index b2ba9c7f2688..aa2ca0f34802 100644
--- a/suite/common/pref/pref-applications-edit.xul
+++ b/suite/common/pref/pref-applications-edit.xul
@@ -29,7 +29,7 @@
 <!DOCTYPE window SYSTEM "chrome://communicator/locale/pref/pref-applications-edit.dtd">
 
 <window id="pickAppHandler"
-        class="dialog" style="width: 30em; user-focus: ignore;"
+        class="dialog" style="width: 30em; -moz-user-focus: ignore;"
         orient="vertical"
         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
         title="&editType.label;"
@@ -277,4 +277,4 @@
   <box id="okCancelButtonsRight"/>
   
 </window>
-        
\ No newline at end of file
+        
diff --git a/suite/common/pref/pref-applications.xul b/suite/common/pref/pref-applications.xul
index 403d76b9aa01..c7ea4aef1fe4 100644
--- a/suite/common/pref/pref-applications.xul
+++ b/suite/common/pref/pref-applications.xul
@@ -31,7 +31,7 @@
     		xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
         xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         class="color-dialog"
-        style="user-focus: ignore;"
+        style="-moz-user-focus: ignore;"
         title="&window.title;" align="vertical"
   		  onload="parent.initPanel('chrome://communicator/content/pref/pref-applications.xul');">