diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 0fc001c4c63..6166017d8de 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -35,7 +35,6 @@ prefs:"layout.writing-mode.enabled" == iframe/size_attributes_vertical_writing_m
== iframe/stacking_context_position_a.html iframe/stacking_context_position_ref.html
# inline_border_a.html inline_border_b.html
-!= linear_gradients_corners_a.html linear_gradients_corners_ref.html
!= linear_gradients_smoke_a.html linear_gradients_smoke_ref.html
flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
# Fails intermittently (#3636)
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 11653bdc73a..39f7d3abe18 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -2403,6 +2403,18 @@
"url": "/_mozilla/css/line_height_float_placement_a.html"
}
],
+ "css/linear_gradients_corners_a.html": [
+ {
+ "path": "css/linear_gradients_corners_a.html",
+ "references": [
+ [
+ "/_mozilla/css/linear_gradients_corners_ref.html",
+ "!="
+ ]
+ ],
+ "url": "/_mozilla/css/linear_gradients_corners_a.html"
+ }
+ ],
"css/linear_gradients_lengths_a.html": [
{
"path": "css/linear_gradients_lengths_a.html",
@@ -7552,6 +7564,18 @@
"url": "/_mozilla/css/line_height_float_placement_a.html"
}
],
+ "css/linear_gradients_corners_a.html": [
+ {
+ "path": "css/linear_gradients_corners_a.html",
+ "references": [
+ [
+ "/_mozilla/css/linear_gradients_corners_ref.html",
+ "!="
+ ]
+ ],
+ "url": "/_mozilla/css/linear_gradients_corners_a.html"
+ }
+ ],
"css/linear_gradients_lengths_a.html": [
{
"path": "css/linear_gradients_lengths_a.html",
diff --git a/tests/ref/linear_gradients_corners_a.html b/tests/wpt/mozilla/tests/css/linear_gradients_corners_a.html
similarity index 84%
rename from tests/ref/linear_gradients_corners_a.html
rename to tests/wpt/mozilla/tests/css/linear_gradients_corners_a.html
index 0a00ee6c4a1..d7c9311bf60 100644
--- a/tests/ref/linear_gradients_corners_a.html
+++ b/tests/wpt/mozilla/tests/css/linear_gradients_corners_a.html
@@ -2,6 +2,7 @@
+