diff --git a/dom/base/crashtests/1517025.html b/dom/base/crashtests/1517025.html
new file mode 100644
index 000000000000..795af0a3a9dd
--- /dev/null
+++ b/dom/base/crashtests/1517025.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <iframe src="/\b%9ª">
+  </body>
+</html>
diff --git a/dom/base/crashtests/crashtests.list b/dom/base/crashtests/crashtests.list
index 2831c4b6688d..0fcf1fc89d16 100644
--- a/dom/base/crashtests/crashtests.list
+++ b/dom/base/crashtests/crashtests.list
@@ -249,3 +249,4 @@ load 1516560.html
 load structured_clone_container_throws.html
 load xhr_empty_datauri.html
 load xhr_html_nullresponse.html
+load 1517025.html
