diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 91a52866ef2..1dcfb20bdf2 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -27,7 +27,6 @@ flaky_cpu == append_style_a.html append_style_b.html
== box_shadow_spread_a.html box_shadow_spread_ref.html
== canvas_radial_gradient_a.html canvas_radial_gradient_ref.html
== case-insensitive-font-family.html case-insensitive-font-family-ref.html
-== empty_cells_a.html empty_cells_ref.html
== fixed_width_overrides_child_intrinsic_width_a.html fixed_width_overrides_child_intrinsic_width_ref.html
prefs:"layout.flex-direction.enabled,layout.flex.enabled" == flex_column_direction.html flex_column_direction_ref.html
prefs:"layout.flex.enabled" == flex_row_direction.html flex_row_direction_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 77ce3c95686..487e5f259d4 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -935,6 +935,18 @@
"url": "/_mozilla/css/data_img_a.html"
}
],
+ "css/empty_cells_a.html": [
+ {
+ "path": "css/empty_cells_a.html",
+ "references": [
+ [
+ "/_mozilla/css/empty_cells_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/empty_cells_a.html"
+ }
+ ],
"css/external_media_query_link.html": [
{
"path": "css/external_media_query_link.html",
@@ -5352,6 +5364,18 @@
"url": "/_mozilla/css/data_img_a.html"
}
],
+ "css/empty_cells_a.html": [
+ {
+ "path": "css/empty_cells_a.html",
+ "references": [
+ [
+ "/_mozilla/css/empty_cells_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/empty_cells_a.html"
+ }
+ ],
"css/external_media_query_link.html": [
{
"path": "css/external_media_query_link.html",
diff --git a/tests/ref/empty_cells_a.html b/tests/wpt/mozilla/tests/css/empty_cells_a.html
similarity index 91%
rename from tests/ref/empty_cells_a.html
rename to tests/wpt/mozilla/tests/css/empty_cells_a.html
index 40396ef5c45..db44cfc5d7b 100644
--- a/tests/ref/empty_cells_a.html
+++ b/tests/wpt/mozilla/tests/css/empty_cells_a.html
@@ -1,6 +1,7 @@
+