diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 7e8551c33e3..18355911cb1 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -11,7 +11,6 @@ fragment=top != ../html/acid2.html acid2_ref.html
== acid2_noscroll.html acid2_ref_broken.html
flaky_cpu == append_style_a.html append_style_b.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
== floated_negative_margins_a.html floated_negative_margins_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 2e3125883ab..b0b420fbceb 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -1259,6 +1259,18 @@
"url": "/_mozilla/css/first_of_type_pseudo_a.html"
}
],
+ "css/fixed_width_overrides_child_intrinsic_width_a.html": [
+ {
+ "path": "css/fixed_width_overrides_child_intrinsic_width_a.html",
+ "references": [
+ [
+ "/_mozilla/css/fixed_width_overrides_child_intrinsic_width_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/fixed_width_overrides_child_intrinsic_width_a.html"
+ }
+ ],
"css/flex_nochild.html": [
{
"path": "css/flex_nochild.html",
@@ -6072,6 +6084,18 @@
"url": "/_mozilla/css/first_of_type_pseudo_a.html"
}
],
+ "css/fixed_width_overrides_child_intrinsic_width_a.html": [
+ {
+ "path": "css/fixed_width_overrides_child_intrinsic_width_a.html",
+ "references": [
+ [
+ "/_mozilla/css/fixed_width_overrides_child_intrinsic_width_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/fixed_width_overrides_child_intrinsic_width_a.html"
+ }
+ ],
"css/flex_nochild.html": [
{
"path": "css/flex_nochild.html",
diff --git a/tests/ref/fixed_width_overrides_child_intrinsic_width_a.html b/tests/wpt/mozilla/tests/css/fixed_width_overrides_child_intrinsic_width_a.html
similarity index 88%
rename from tests/ref/fixed_width_overrides_child_intrinsic_width_a.html
rename to tests/wpt/mozilla/tests/css/fixed_width_overrides_child_intrinsic_width_a.html
index 33e9e7c629b..f12c3e9e65a 100644
--- a/tests/ref/fixed_width_overrides_child_intrinsic_width_a.html
+++ b/tests/wpt/mozilla/tests/css/fixed_width_overrides_child_intrinsic_width_a.html
@@ -1,6 +1,7 @@
+