diff --git a/layout/base/crashtests/457514.html b/layout/base/crashtests/457514.html
new file mode 100644
index 000000000000..6bf3e0b54b0f
--- /dev/null
+++ b/layout/base/crashtests/457514.html
@@ -0,0 +1,27 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+
+<script type="text/javascript">
+
+function boom()
+{
+  var d = document.getElementById("d");
+  var s = document.getElementById("s");
+  s.insertBefore(document.createTextNode("T"), s.firstChild);
+  d.appendChild(s);
+  s.appendChild(document.createTextNode("\n"));
+}
+
+</script>
+
+<style type="text/css"> 
+
+div::first-letter { float: left; } 
+
+</style>
+
+</head>
+
+<body onload="boom();"><div id="d"><span id="s">h</span></div></body>
+
+</html>
diff --git a/layout/base/crashtests/crashtests.list b/layout/base/crashtests/crashtests.list
index 94c68bb6ecd3..776456178d6c 100644
--- a/layout/base/crashtests/crashtests.list
+++ b/layout/base/crashtests/crashtests.list
@@ -258,6 +258,7 @@ load 455063-3.html
 load 455171-4.html
 load 455623-1.html
 load 457362-1.xhtml
+load 457514.html
 asserts(0-1) load 460389-1.html # Bug 780985
 load 466763-1.html
 load 467881-1.html
