--- a/layout/base/tests/chrome/chrome.ini
+++ b/layout/base/tests/chrome/chrome.ini
@@ -1,17 +1,16 @@
 [DEFAULT]
 skip-if = os == 'android'
 support-files =
   animated.gif
   blue-32x32.png
   bug495648.rdf
   bug551434_childframe.html
   chrome_content_integration_window.xul
-  chrome_over_plugin_window.xul
   default_background_window.xul
   dialog_with_positioning_window.xul
   no_clip_iframe_subdoc.html
   no_clip_iframe_window.xul
   printpreview_bug396024_helper.xul
   printpreview_bug482976_helper.xul
   printpreview_helper.xul
   file_bug1018265.xul
@@ -28,16 +27,19 @@ support-files =
 [test_bug708062.html]
 [test_bug812817.xul]
 [test_bug847890_paintFlashing.html]
 [test_bug1018265.xul]
 [test_bug1041200.xul]
 support-files=bug1041200_window.html
 [test_chrome_content_integration.xul]
 [test_chrome_over_plugin.xul]
+support-files =
+  chrome_over_plugin_window.xul
+  chrome_over_plugin_window_frame.html
 [test_default_background.xul]
 [test_dialog_with_positioning.html]
 tags = openwindow
 [test_fixed_bg_scrolling_repaints.html]
 [test_leaf_layers_partition_browser_window.xul]
 skip-if = (!debug) || (toolkit == "cocoa") || (os == "linux") # Disabled on Mac and Linux because of Bug 992311
 [test_no_clip_iframe.xul]
 [test_prerendered_transforms.html]

--- a/layout/base/tests/chrome/chrome_over_plugin_window.xul
+++ b/layout/base/tests/chrome/chrome_over_plugin_window.xul
@@ -2,21 +2,17 @@
 <?xml-stylesheet type="text/css" href="chrome://global/skin"?>
 <window title="Content/chrome integration subwindow"
         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
         onload="runTests()">\
   <!-- We're mainly testing that a) translucent chrome elements cause the plugin to be clipped away and
        b) translucent content elements do NOT cause the plugin to be clipped away -->
   <stack style="height:100px; width:150px;">
     <iframe type="content" style="border:none;" id="f"
-            src="data:text/html,&lt;embed id='e' type='application/x-test' wmode='window'
-                                style='position:absolute;left:0;top:0;width:100px;height:100px'&gt;&lt;/embed&gt;
-                                &lt;div style='position:absolute;left:0;top:80px;width:100px;height:10px;background:rgba(0,0,128,0.5)'&gt;&lt;/div&gt;
-                                &lt;div style='position:absolute;left:0;top:90px;width:100px;height:10px;background:blue'&gt;&lt;/div&gt;
-                                "/>
+            src="http://example.org/chrome/layout/base/tests/chrome/chrome_over_plugin_window_frame.html"/>
     <vbox>
       <vbox style="height:25px; background:yellow;"/> <!-- plugin should be covered here -->
       <vbox style="height:25px; background:rgba(0,128,0,0.5);"/> <!-- plugin should be covered here -->
       <vbox style="height:50px;"/> <!-- plugin should be visible here -->
     </vbox>
   </stack>
 
   <script type="application/javascript">

new file mode 100644
--- /dev/null
+++ b/layout/base/tests/chrome/chrome_over_plugin_window_frame.html
@@ -0,0 +1,4 @@
+<embed id="e" type="application/x-test" wmode="window"
+       style="position:absolute;left:0;top:0;width:100px;height:100px"></embed>
+<div style="position:absolute;left:0;top:80px;width:100px;height:10px;background:rgba(0,0,128,0.5)"></div>
+<div style="position:absolute;left:0;top:90px;width:100px;height:10px;background:blue"></div>