diff --git a/mozilla/toolkit/content/widgets/preferences.xml b/mozilla/toolkit/content/widgets/preferences.xml
index 59cbd923681..763d955f8fd 100644
--- a/mozilla/toolkit/content/widgets/preferences.xml
+++ b/mozilla/toolkit/content/widgets/preferences.xml
@@ -50,8 +50,6 @@
             var event = document.createEvent("Events");
             event.initEvent("change", false, true);
             aPreference.dispatchEvent(event);
-            if (aPreference.hasAttribute("onchange"))
-              (new Function ("event", aPreference.getAttribute("onchange")))(event);
           }
           catch (e) {
             dump(e);