diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 587c75f167b..225acf30e2d 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -5916,6 +5916,12 @@
             "url": "/_mozilla/mozilla/mozbrowser/iframe_goback.html"
           }
         ],
+        "mozilla/mozbrowser/iframe_reload_twice.html": [
+          {
+            "path": "mozilla/mozbrowser/iframe_reload_twice.html",
+            "url": "/_mozilla/mozilla/mozbrowser/iframe_reload_twice.html"
+          }
+        ],
         "mozilla/mozbrowser/mozbrowsericonchange_event.html": [
           {
             "path": "mozilla/mozbrowser/mozbrowsericonchange_event.html",
diff --git a/tests/wpt/mozilla/tests/mozilla/mozbrowser/iframe_reload_twice.html b/tests/wpt/mozilla/tests/mozilla/mozbrowser/iframe_reload_twice.html
new file mode 100644
index 00000000000..0b42fafbc55
--- /dev/null
+++ b/tests/wpt/mozilla/tests/mozilla/mozbrowser/iframe_reload_twice.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Reloading an iframe twice doesn't panic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe></iframe>
+<script>
+async_test(function(t) {
+  var iframe = document.querySelector('iframe');
+  var loaded = false;
+  iframe.onload = t.step_func(function() {
+    if (!loaded) {
+      loaded = true;
+      iframe.reload();
+      iframe.reload();
+    } else {
+      t.done();
+    }
+  });
+  iframe.mozbrowser = true;
+  iframe.src = "about:blank";
+});
+</script>
