diff --git a/dev/core/src/com/google/gwt/core/linker/CrossSiteIframeLinker.java b/dev/core/src/com/google/gwt/core/linker/CrossSiteIframeLinker.java
index 446a93f..39f4eea 100644
--- a/dev/core/src/com/google/gwt/core/linker/CrossSiteIframeLinker.java
+++ b/dev/core/src/com/google/gwt/core/linker/CrossSiteIframeLinker.java
@@ -237,8 +237,7 @@
    */
   protected String getJsDevModeRedirectHook(LinkerContext context) {
     // Enable Super Dev Mode for this app if the devModeRedirectEnabled config property is true.
-    // TODO(skybrian) Change the default to enabled once we're sure it's safe.
-    if (getBooleanConfigurationProperty(context, "devModeRedirectEnabled", false)) {
+    if (getBooleanConfigurationProperty(context, "devModeRedirectEnabled", true)) {
       return "com/google/gwt/core/linker/DevModeRedirectHook.js";
     } else {
       return "";
@@ -254,7 +253,8 @@
   protected String getJsDevModeUrlValidation(LinkerContext context) {
     // As a default, if the user provides devModeUrlWhitelistRegexp, then we verify that it
     // matches devModeUrl.
-    String regexp = getStringConfigurationProperty(context, "devModeUrlWhitelistRegexp", "");
+    String regexp = getStringConfigurationProperty(context, "devModeUrlWhitelistRegexp",
+        "http://(localhost|127\\.0\\.0\\.1)(:\\d+)?/.*");
     if (!regexp.isEmpty()) {
       return ""
           + "if (!/^" + regexp.replace("/", "\\/") + "$/.test(devModeUrl)) {\n"
diff --git a/user/src/com/google/gwt/user/tools/templates/sample/_srcFolder_/_moduleFolder_/_moduleShortName_.gwt.xmlsrc b/user/src/com/google/gwt/user/tools/templates/sample/_srcFolder_/_moduleFolder_/_moduleShortName_.gwt.xmlsrc
index e836953..911ba20 100644
--- a/user/src/com/google/gwt/user/tools/templates/sample/_srcFolder_/_moduleFolder_/_moduleShortName_.gwt.xmlsrc
+++ b/user/src/com/google/gwt/user/tools/templates/sample/_srcFolder_/_moduleFolder_/_moduleShortName_.gwt.xmlsrc
@@ -22,5 +22,4 @@
 
   <!-- allow Super Dev Mode -->
   <add-linker name="xsiframe"/>
-  <set-configuration-property name="devModeRedirectEnabled" value="true"/>
 </module>