diff --git a/tests/content/test_node_lookupPrefix.html b/tests/content/test_node_lookupPrefix.html
deleted file mode 100644
index a5359f6dcba..00000000000
--- a/tests/content/test_node_lookupPrefix.html
+++ /dev/null
@@ -1,48 +0,0 @@
-<!doctype html>
-<html>
-    <head>
-        <script src="harness.js"></script>
-    </head>
-    <body>
-        <x xarg="xval">
-            <!--comment-->
-            <?test test?>
-            TEST
-            <x/>
-        </x>
-        <script>
-            document.documentElement.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:x", "test");
-            document.body.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:s", "test");
-            var x = document.getElementsByTagName("x")[0];
-            x.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:t", "test");
-            var yprefix = document.createElementNS("ynamespace", "yprefix:ylocalname");
-            var ynoprefix = document.createElementNS("ynamespace", "ylocalname");
-            ynoprefix.setAttribute("ynoprefixattr", "yval");
-            ynoprefix.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:yattr", "yval");
-
-            // Step 1
-            is(document.lookupPrefix(""), null);
-            is(document.lookupPrefix(null), null);
-
-            // Element step 1
-            is(yprefix.lookupPrefix("ynamespace"), "yprefix");
-            is(ynoprefix.lookupPrefix("ynamespace"), null);
-
-            // Element step 2
-            is(x.lookupPrefix("test"), "t");
-            is(ynoprefix.lookupPrefix("yval"), "yattr");
-
-            // analogous to wpt - https://github.com/w3c/web-platform-tests/blob/master/dom/nodes/Node-lookupPrefix.xhtml
-            is(document.lookupPrefix("test"), "x");
-            is(x.lookupPrefix("test"), "t");
-            is(x.lookupPrefix("http://www.w3.org/1999/xhtml"), null);
-            is(x.lookupPrefix("something"), null);
-            is(x.lookupPrefix(null), null);
-            is(x.parentNode.lookupPrefix("test"), "s");
-            is(x.firstChild.lookupPrefix("test"), "t");
-            is(x.childNodes[1].lookupPrefix("test"), "t");
-            is(x.childNodes[2].lookupPrefix("test"), "t");
-            is(x.lastChild.lookupPrefix("test"), "t");
-        </script>
-    </body>
-</html>
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 95ccaadae16..de093bd00a2 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -411,6 +411,12 @@
             "url": "/_mozilla/mozilla/node_isEqualNode.html"
           }
         ],
+        "mozilla/node_lookupPrefix.html": [
+          {
+            "path": "mozilla/node_lookupPrefix.html",
+            "url": "/_mozilla/mozilla/node_lookupPrefix.html"
+          }
+        ],
         "mozilla/node_normalize.html": [
           {
             "path": "mozilla/node_normalize.html",
diff --git a/tests/wpt/mozilla/tests/mozilla/node_lookupPrefix.html b/tests/wpt/mozilla/tests/mozilla/node_lookupPrefix.html
new file mode 100644
index 00000000000..dfd898dc85f
--- /dev/null
+++ b/tests/wpt/mozilla/tests/mozilla/node_lookupPrefix.html
@@ -0,0 +1,51 @@
+<!doctype html>
+<html>
+    <head>
+        <script src="/resources/testharness.js"></script>
+        <script src="/resources/testharnessreport.js"></script>
+    </head>
+    <body>
+        <x xarg="xval">
+            <!--comment-->
+            <?test test?>
+            TEST
+            <x/>
+        </x>
+        <script>
+        test(function() {
+            document.documentElement.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:x", "test");
+            document.body.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:s", "test");
+            var x = document.getElementsByTagName("x")[0];
+            x.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:t", "test");
+            var yprefix = document.createElementNS("ynamespace", "yprefix:ylocalname");
+            var ynoprefix = document.createElementNS("ynamespace", "ylocalname");
+            ynoprefix.setAttribute("ynoprefixattr", "yval");
+            ynoprefix.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:yattr", "yval");
+
+            // Step 1
+            assert_equals(document.lookupPrefix(""), null);
+            assert_equals(document.lookupPrefix(null), null);
+
+            // Element step 1
+            assert_equals(yprefix.lookupPrefix("ynamespace"), "yprefix");
+            assert_equals(ynoprefix.lookupPrefix("ynamespace"), null);
+
+            // Element step 2
+            assert_equals(x.lookupPrefix("test"), "t");
+            assert_equals(ynoprefix.lookupPrefix("yval"), "yattr");
+
+            // analogous to wpt - https://github.com/w3c/web-platform-tests/blob/master/dom/nodes/Node-lookupPrefix.xhtml
+            assert_equals(document.lookupPrefix("test"), "x");
+            assert_equals(x.lookupPrefix("test"), "t");
+            assert_equals(x.lookupPrefix("http://www.w3.org/1999/xhtml"), null);
+            assert_equals(x.lookupPrefix("something"), null);
+            assert_equals(x.lookupPrefix(null), null);
+            assert_equals(x.parentNode.lookupPrefix("test"), "s");
+            assert_equals(x.firstChild.lookupPrefix("test"), "t");
+            assert_equals(x.childNodes[1].lookupPrefix("test"), "t");
+            assert_equals(x.childNodes[2].lookupPrefix("test"), "t");
+            assert_equals(x.lastChild.lookupPrefix("test"), "t");
+        });
+        </script>
+    </body>
+</html>
