diff --git a/layout/tools/pageloader/pageloader.xul b/layout/tools/pageloader/pageloader.xul
index cc33d4bb1ba..f096a057107 100644
--- a/layout/tools/pageloader/pageloader.xul
+++ b/layout/tools/pageloader/pageloader.xul
@@ -46,11 +46,11 @@
   screenX="0" screenY="0"
   onload="plInit()">
 
-  <script type="application/x-javascript" 
+  <script type="application/javascript"
           src="chrome://global/content/globalOverlay.js"/>
-  <script type="application/x-javascript" src="report.js"></script>
-  <script type="application/x-javascript" src="pageloader.js"></script>
-  <script type="application/x-javascript" src="quit.js"></script>
+  <script type="application/javascript" src="report.js"/>
+  <script type="application/javascript" src="pageloader.js"/>
+  <script type="application/javascript" src="quit.js"/>
 
   <browser id="contentPageloader" src="about:blank" 
     type="content" flex="1"/>
diff --git a/layout/tools/tests/content_dumping.html b/layout/tools/tests/content_dumping.html
index 5bb4f428d92..d0312bbf2b8 100644
--- a/layout/tools/tests/content_dumping.html
+++ b/layout/tools/tests/content_dumping.html
@@ -5,7 +5,7 @@
 	<title>Control Frame</title>
 </head>
 
-<script type="application/x-javascript" language="Javascript">
+<script type="application/javascript">
 
 const nsILayoutDebuggingTools = Components.interfaces.nsILayoutDebuggingTools;
 var gDebugTools;
diff --git a/layout/tools/tests/debug_utils.html b/layout/tools/tests/debug_utils.html
index 310eac15e19..4c2ba98c5fc 100644
--- a/layout/tools/tests/debug_utils.html
+++ b/layout/tools/tests/debug_utils.html
@@ -4,7 +4,7 @@
 <head>
 	<title>Layout Debug Utilities</title>
 </head>
-<script type="application/x-javascript" language="Javascript">
+<script type="application/javascript">
 
 const nsILayoutDebuggingTools = Components.interfaces.nsILayoutDebuggingTools;
 var gDebugTools;
diff --git a/layout/tools/tests/regression_tests.html b/layout/tools/tests/regression_tests.html
index a306770073f..8eff8fc77e9 100644
--- a/layout/tools/tests/regression_tests.html
+++ b/layout/tools/tests/regression_tests.html
@@ -34,7 +34,7 @@ div.indent
 }
 </style>
 
-<script src="regression_tests.js" type="application/x-javascript" language="Javascript">
+<script src="regression_tests.js" type="application/javascript">
 <!--
 
 //-->
