diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 99fed4cbd41..870984d2d50 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -11230,12 +11230,6 @@
      {}
     ]
    ],
-   "mozilla/bad_cert_detected.html": [
-    [
-     "/_mozilla/mozilla/bad_cert_detected.html",
-     {}
-    ]
-   ],
    "mozilla/binding_keyword.html": [
     [
      "/_mozilla/mozilla/binding_keyword.html",
@@ -24283,10 +24277,6 @@
    "170d51460da58c16f5cf94ecda18f18a1c18c116",
    "support"
   ],
-  "mozilla/bad_cert_detected.html": [
-   "5d49332d2a6c823bfaf378f84641ce8bba5c8210",
-   "testharness"
-  ],
   "mozilla/binding_keyword.html": [
    "c79aa6d506fbabbed0f6f31d1b8600ea6ba8ff41",
    "testharness"
diff --git a/tests/wpt/mozilla/tests/mozilla/bad_cert_detected.html b/tests/wpt/mozilla/tests/mozilla/bad_cert_detected.html
deleted file mode 100644
index 7b79c46b48d..00000000000
--- a/tests/wpt/mozilla/tests/mozilla/bad_cert_detected.html
+++ /dev/null
@@ -1,24 +0,0 @@
-<html>
-<head>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="resources/origin_helpers.js?pipe=sub"></script>
-</head>
-<body>
-<script>
-var t = async_test("Invalid SSL cert noticed");
-t.step(function() {
-  var target = location.href.replace(HTTP_ORIGIN, HTTPS_ORIGIN)
-                            .replace('bad_cert_detected.html',
-                                     'resources/worker_success.js');
-  var w = new Worker(target);
-  // If the script executes successfully, it should send a message. That indicates that
-  // there was no validation failure, which is bad.
-  w.addEventListener('message', t.unreached_func("cert not detected as invalid"), true);
-  // When the worker has a cert failure, that translates into an early error that is reported
-  // to the Worker object.
-  w.addEventListener('error', t.step_func_done(), true);
-});
-</script>
-</body>
-</html>
