diff --git a/browser/app/profile/all.js b/browser/app/profile/all.js
index 6cf2a925ebfd..dcfce62119fd 100644
--- a/browser/app/profile/all.js
+++ b/browser/app/profile/all.js
@@ -300,7 +300,7 @@ pref("javascript.options.strict",           false);
 pref("javascript.options.showInConsole",    false);
 
 // popups.policy 1=allow,2=reject
-pref("privacy.popups.policy",               2);
+pref("privacy.popups.policy",               1);
 pref("privacy.popups.usecustom",            false);
 
 // advanced prefs
diff --git a/browser/app/profile/firebird.js b/browser/app/profile/firebird.js
index 6cf2a925ebfd..dcfce62119fd 100644
--- a/browser/app/profile/firebird.js
+++ b/browser/app/profile/firebird.js
@@ -300,7 +300,7 @@ pref("javascript.options.strict",           false);
 pref("javascript.options.showInConsole",    false);
 
 // popups.policy 1=allow,2=reject
-pref("privacy.popups.policy",               2);
+pref("privacy.popups.policy",               1);
 pref("privacy.popups.usecustom",            false);
 
 // advanced prefs
diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 454acc04bee9..68082c56f804 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -205,8 +205,15 @@ function RegisterTabOpenObserver()
   service.addObserver(observer, "open-new-tab-request", false);
 }
 
+function PopupBlocked(event)
+{
+  alert("A popup was blocked.");
+}
+
 function Startup()
 {
+  addEventListener("DOMPopupBlocked", PopupBlocked, false);
+
   // init globals
   gNavigatorBundle = document.getElementById("bundle_browser");
   gBrandBundle = document.getElementById("bundle_brand");