diff --git a/testing/web-platform/mozilla/meta/service-workers/service-worker/waiting.https.html.ini b/testing/web-platform/mozilla/meta/service-workers/service-worker/waiting.https.html.ini
deleted file mode 100644
index 5e5446fc0b9c..000000000000
--- a/testing/web-platform/mozilla/meta/service-workers/service-worker/waiting.https.html.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[waiting.https.html]
-  type: testharness
-  expected: TIMEOUT
-  [waiting is set]
-    expected: TIMEOUT
-
diff --git a/testing/web-platform/mozilla/tests/service-workers/service-worker/waiting.https.html b/testing/web-platform/mozilla/tests/service-workers/service-worker/waiting.https.html
index d96a1de8d08d..eff9c80a4f65 100644
--- a/testing/web-platform/mozilla/tests/service-workers/service-worker/waiting.https.html
+++ b/testing/web-platform/mozilla/tests/service-workers/service-worker/waiting.https.html
@@ -26,16 +26,19 @@ async_test(function(t) {
     .then(function() {
         var controller = frame.contentWindow.navigator.serviceWorker.controller;
         assert_equals(controller, null);
-        assert_equals(registration.active, null);
-        assert_equals(registration.waiting.scriptURL, normalizeURL(url));
+        // Nothing in the spec prohibits a worker from going to active
+        // immediately.
+        // Step 26 of the [[Install]] algorithm
+        // "If registration's waiting worker waitingWorker is not null and
+        // waitingWorker's skip waiting flag is not set, invoke Activate
+        // algorithm, or its equivalent, with registration as its argument."
+        var w = registration.waiting || registration.active;
+        assert_equals(w.scriptURL, normalizeURL(url));
         assert_equals(registration.installing, null);
-
-        // FIXME: Add a test for a frame created after installation.
-        // Should the existing frame ("frame") block activation?
       })
     .then(function() {
         frame.remove();
         return service_worker_unregister_and_done(t, scope);
       });
-}, 'waiting is set');
+}, 'waiting or active is set');
 </script>