diff --git a/layout/generic/crashtests/406137.html b/layout/generic/crashtests/406137.html
new file mode 100644
index 00000000000..75337de72c7
--- /dev/null
+++ b/layout/generic/crashtests/406137.html
@@ -0,0 +1,16 @@
+<html>
+  <head>
+    <title>redhat.com | Home</title>
+    <style>
+      #navWrap:after { content: "."; display: block; clear: both; }
+    </style>
+  </head>
+  <body>
+    <div id="navWrap">
+      <div style="float: left;">
+        foo
+      </div>
+    </div>
+    <img src="../../../testing/crashtest/images/tree.gif" style="float: right;">
+  </body>
+</html>
diff --git a/layout/generic/crashtests/crashtests.list b/layout/generic/crashtests/crashtests.list
index 7c5cb39f0eb..ba8133033f0 100644
--- a/layout/generic/crashtests/crashtests.list
+++ b/layout/generic/crashtests/crashtests.list
@@ -189,6 +189,7 @@ load 404215-2.html
 load 404215-3.html
 load 404219-1.html
 load 404219-2.html
+load 406137.html
 load 406380.html
 load 406902-1.html
 load 407009-1.xhtml
