diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 25e8c932b273..d38011330c96 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -1032,6 +1032,18 @@
             "url": "/_mozilla/css/box_shadow_blur_a.html"
           }
         ],
+        "css/box_shadow_blur_fixed.html": [
+          {
+            "path": "css/box_shadow_blur_fixed.html",
+            "references": [
+              [
+                "/_mozilla/css/box_shadow_blur_fixed_ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/box_shadow_blur_fixed.html"
+          }
+        ],
         "css/box_shadow_border_box_a.html": [
           {
             "path": "css/box_shadow_border_box_a.html",
@@ -10102,6 +10114,18 @@
           "url": "/_mozilla/css/box_shadow_blur_a.html"
         }
       ],
+      "css/box_shadow_blur_fixed.html": [
+        {
+          "path": "css/box_shadow_blur_fixed.html",
+          "references": [
+            [
+              "/_mozilla/css/box_shadow_blur_fixed_ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/box_shadow_blur_fixed.html"
+        }
+      ],
       "css/box_shadow_border_box_a.html": [
         {
           "path": "css/box_shadow_border_box_a.html",
diff --git a/tests/wpt/mozilla/tests/css/box_shadow_blur_fixed.html b/tests/wpt/mozilla/tests/css/box_shadow_blur_fixed.html
new file mode 100644
index 000000000000..429a18dbc800
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/box_shadow_blur_fixed.html
@@ -0,0 +1,24 @@
+<head>
+    <link rel='match' href='box_shadow_blur_fixed_ref.html'>
+    <style>
+        #div_outer {
+            width: 100%;
+            position: fixed;
+            top: 100px;
+            left: 0;
+        }
+
+        #div_inner {
+            background: lightgrey;
+            height: 40px;
+            box-shadow: 0 0 30px 30px darkblue;
+        }
+    </style>
+</head>
+
+<body>
+    <div id="div_outer">
+        <div id="div_inner">
+        </div>
+    </div>
+</body>
\ No newline at end of file
diff --git a/tests/wpt/mozilla/tests/css/box_shadow_blur_fixed_ref.html b/tests/wpt/mozilla/tests/css/box_shadow_blur_fixed_ref.html
new file mode 100644
index 000000000000..03e797894705
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/box_shadow_blur_fixed_ref.html
@@ -0,0 +1,23 @@
+<head>
+    <style>
+        #div_outer {
+            width: 100%;
+            position: absolute;
+            top: 100px;
+            left: 0;
+        }
+
+        #div_inner {
+            background: lightgrey;
+            height: 40px;
+            box-shadow: 0 0 30px 30px darkblue;
+        }
+    </style>
+</head>
+
+<body>
+    <div id="div_outer">
+        <div id="div_inner">
+        </div>
+    </div>
+</body>
\ No newline at end of file
