diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 380ca0c7023..a683eeb8628 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -19368,11 +19368,11 @@
    "testharness"
   ],
   "mozilla/scroll_root.html": [
-   "b1a9cb590b0fcce9c883f99e17fa029a999b699b",
+   "5896eb3957da1eb85a26680053823d3f3bf9af49",
    "reftest"
   ],
   "mozilla/scroll_root_ref.html": [
-   "6503ad5d5265c0698f61fc607e2e4e017b31cb6f",
+   "c7d4cfec7b9d9b5daf32841172721ddac3e4d071",
    "support"
   ],
   "mozilla/scroll_top_null_target.html": [
diff --git a/tests/wpt/mozilla/tests/mozilla/scroll_root.html b/tests/wpt/mozilla/tests/mozilla/scroll_root.html
index b1a9cb590b0..5896eb3957d 100644
--- a/tests/wpt/mozilla/tests/mozilla/scroll_root.html
+++ b/tests/wpt/mozilla/tests/mozilla/scroll_root.html
@@ -7,6 +7,9 @@
         <style>
             body {
                 background: green;
+
+                /* FIXME(mrobinson): Remove this workaround when #25559 is fixed. */
+                margin: 0;
             }
         </style>
     </head>
diff --git a/tests/wpt/mozilla/tests/mozilla/scroll_root_ref.html b/tests/wpt/mozilla/tests/mozilla/scroll_root_ref.html
index 6503ad5d526..c7d4cfec7b9 100644
--- a/tests/wpt/mozilla/tests/mozilla/scroll_root_ref.html
+++ b/tests/wpt/mozilla/tests/mozilla/scroll_root_ref.html
@@ -5,7 +5,14 @@
         <style>
             body {
                 background: green;
+
+                /* FIXME(mrobinson): Remove this workaround when #25559 is fixed. */
+                margin: 0;
             }
         </style>
     </head>
+    <body>
+        <!-- FIXME(mrobinson): Remove this workaround div when #25559 is fixed. -->
+        <div style="height: 10000px;"></div>
+    </body>
 </html>
