diff --git a/toolkit/components/viewconfig/content/configIntValue.xul b/toolkit/components/viewconfig/content/configIntValue.xul
index b57d76b6288..c5996c3b0e4 100644
--- a/toolkit/components/viewconfig/content/configIntValue.xul
+++ b/toolkit/components/viewconfig/content/configIntValue.xul
@@ -47,7 +47,7 @@
         buttonpack="center"
         style="min-width: 29em; min-height: 10em;">
 
-<script type="application/x-javascript">
+<script type="application/javascript">
   <![CDATA[
     var gIntValueDialogParams;
     function onIntValueDialogLoad()
diff --git a/toolkit/content/aboutRights-unbranded.xhtml b/toolkit/content/aboutRights-unbranded.xhtml
index e3efdfe66b1..0a030d49173 100644
--- a/toolkit/content/aboutRights-unbranded.xhtml
+++ b/toolkit/content/aboutRights-unbranded.xhtml
@@ -80,7 +80,7 @@
   </ol>
 </div>
 
-<script type="application/x-javascript"><![CDATA[
+<script type="application/javascript"><![CDATA[
   var servicesDiv = document.getElementById("webservices-container");
   servicesDiv.style.display = "none";
 
diff --git a/toolkit/content/aboutRights.xhtml b/toolkit/content/aboutRights.xhtml
index 8a53c105951..69e7163cc27 100644
--- a/toolkit/content/aboutRights.xhtml
+++ b/toolkit/content/aboutRights.xhtml
@@ -87,7 +87,7 @@
   </ol>
 </div>
 
-<script type="application/x-javascript"><![CDATA[
+<script type="application/javascript"><![CDATA[
   var servicesDiv = document.getElementById("webservices-container");
   servicesDiv.style.display = "none";
 
diff --git a/toolkit/content/commonDialog.xul b/toolkit/content/commonDialog.xul
index c81c4481da8..f65e8649d67 100644
--- a/toolkit/content/commonDialog.xul
+++ b/toolkit/content/commonDialog.xul
@@ -17,7 +17,7 @@
         buttonpack="center">
     
   <script type="application/javascript" src="chrome://global/content/commonDialog.js"/>
-  <script type="application/x-javascript" src="chrome://global/content/globalOverlay.js"/>
+  <script type="application/javascript" src="chrome://global/content/globalOverlay.js"/>
 
   <commandset id="selectEditMenuItems">
     <command id="cmd_copy" oncommand="goDoCommand('cmd_copy')" disabled="true"/>
diff --git a/toolkit/crashreporter/content/crashes.xhtml b/toolkit/crashreporter/content/crashes.xhtml
index 74dd29de6cb..4b3a6aa3736 100644
--- a/toolkit/crashreporter/content/crashes.xhtml
+++ b/toolkit/crashreporter/content/crashes.xhtml
@@ -59,7 +59,7 @@ td:last-child {
 </style>
 <link rel="stylesheet" media="screen, projection" type="text/css"
       href="chrome://global/skin/dirListing/dirListing.css"/>
-<script type="application/x-javascript;version=1.8" src="chrome://global/content/crashes.js"/>
+<script type="application/javascript;version=1.8" src="chrome://global/content/crashes.js"/>
 
 <title>&crashes.title;</title>
 </head><body onload="init()" dir="&locale.dir;">
