diff --git a/widget/src/cocoa/crashtests/403296-1.xhtml b/widget/src/cocoa/crashtests/403296-1.xhtml
new file mode 100644
index 00000000000..800eaa3558a
--- /dev/null
+++ b/widget/src/cocoa/crashtests/403296-1.xhtml
@@ -0,0 +1,10 @@
+<html xmlns="http://www.w3.org/1999/xhtml" 
+      class="reftest-wait"  
+      style="margin: 12em; padding: 20px 10em; opacity: 0.2; font-size: 11.2px; -moz-appearance: toolbar; white-space: nowrap;"><body 
+      style="position: absolute;" 
+      onload="setTimeout(function() { document.body.removeChild(document.getElementById('tr')); document.documentElement.removeAttribute('class'); }, 30);">
+
+xxx
+yyy
+
+<tr id="tr">300</tr></body></html>
diff --git a/widget/src/cocoa/crashtests/crashtests.list b/widget/src/cocoa/crashtests/crashtests.list
index 5bb5c912033..4d7c60c3495 100644
--- a/widget/src/cocoa/crashtests/crashtests.list
+++ b/widget/src/cocoa/crashtests/crashtests.list
@@ -1 +1,2 @@
 load 397209-1.html
+load 403296-1.xhtml
