diff --git a/css/css-cascade/META.yml b/css/css-cascade/META.yml
index a1a716769..4c947d86a 100644
--- a/css/css-cascade/META.yml
+++ b/css/css-cascade/META.yml
@@ -337,3 +337,8 @@ links:
   - subtest: Mutating selectorText on outer style rule causes correct inner specificity
     test: scope-nesting.html
   url: https://bugzilla.mozilla.org/show_bug.cgi?id=1936293
+- product: firefox
+  results:
+  - subtest: The revert keyword works with @keyframes
+    test: revert-val-006.html
+  url: https://bugzilla.mozilla.org/show_bug.cgi?id=1939848