diff --git a/layout/generic/crashtests/517968.html b/layout/generic/crashtests/517968.html
new file mode 100644
index 000000000000..9283accdb114
--- /dev/null
+++ b/layout/generic/crashtests/517968.html
@@ -0,0 +1,6 @@
+<script>
+var rng = document.createRange();
+window.getSelection()["addRange"](rng);
+window.getSelection()["addRange"](rng);
+window.getSelection()["addRange"](rng);
+</script>
diff --git a/layout/generic/crashtests/crashtests.list b/layout/generic/crashtests/crashtests.list
index 1b7b7730a9fb..cd1650169234 100644
--- a/layout/generic/crashtests/crashtests.list
+++ b/layout/generic/crashtests/crashtests.list
@@ -271,3 +271,4 @@ load 508908-1.html
 load 505912-1.html
 # load 508115-1.html
 load 511482.html
+load 517968.html