--- a/dom/media/test/test_buffered.html
+++ b/dom/media/test/test_buffered.html
@@ -71,21 +71,22 @@ function testBuffered(e) {
 
 function fetch(url, fetched_callback) {
   var xhr = new XMLHttpRequest();
   xhr.open("GET", url, true);
   xhr.responseType = "blob";
 
   var loaded = function (event) {
     if (xhr.status == 200 || xhr.status == 206) {
+      ok(true, `${url}: Fetch succeeded, status=${xhr.status}`);
       // Request fulfilled. Note sometimes we get 206... Presumably because either
       // httpd.js or Necko cached the result.
       fetched_callback(window.URL.createObjectURL(xhr.response));
     } else {
-      ok(false, "Fetch failed headers=" + xhr.getAllResponseHeaders());
+      ok(false, `${url}: Fetch failed, headers=${xhr.getAllResponseHeaders()}`);
     }
   };
 
   xhr.addEventListener("load", loaded);
   xhr.send();
 }
 
 function startTest(test, token) {