diff --git a/layout/tables/crashtests/351326-1.xhtml b/layout/tables/crashtests/351326-1.xhtml
new file mode 100644
index 00000000000..7fc72c27637
--- /dev/null
+++ b/layout/tables/crashtests/351326-1.xhtml
@@ -0,0 +1,14 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<body onload="document.getElementById('w').setAttribute('rowspan', 0);">
+
+<table>
+  <tbody>
+    <tr></tr>
+    <tr>
+      <td id="w">y</td>
+    </tr>
+  </tbody>
+</table>
+
+</body>
+</html>
diff --git a/layout/tables/crashtests/388700-1.html b/layout/tables/crashtests/388700-1.html
new file mode 100644
index 00000000000..f75336e15f1
--- /dev/null
+++ b/layout/tables/crashtests/388700-1.html
@@ -0,0 +1,34 @@
+<html>
+
+<head>
+<script>
+
+function boom()
+{
+  document.body.style.direction = "rtl";
+  tbody = document.getElementById("tbody");
+  tbody.contentEditable = "true";
+  tbody.focus();
+}
+
+</script>
+</head>
+
+<body onload="boom();">
+
+<table border="1">
+  <tbody>
+    <tr>
+      <td>
+        <table border="1" style="border-collapse: collapse;"><tbody id="tbody"><tr></tr>
+          <tr>
+            <td></td>
+          </tr>
+        </table>
+      </td>
+    </tr>
+  </tbody>
+</table>
+
+</body>
+</html>
diff --git a/layout/tables/crashtests/crashtests.list b/layout/tables/crashtests/crashtests.list
index dba55b1f323..bd6114561e4 100644
--- a/layout/tables/crashtests/crashtests.list
+++ b/layout/tables/crashtests/crashtests.list
@@ -13,6 +13,7 @@ load 347506-2.xhtml
 load 347725-1.xhtml
 load 348977-1.xhtml
 load 350524-1.xhtml
+load 351326-1.xhtml
 load 351328-1.xhtml
 load 351628-1.xhtml
 load 358679-1.xhtml
@@ -32,6 +33,7 @@ load 379687-1.html
 load 385132-1.xhtml
 load 385132-2.html
 load 387051-1.html
+load 388700-1.html
 load 391898-1.html
 load 391901-1.html
 load 397448-1.html
