1 files changed, 18 insertions, 0 deletions
diff --git a/toolkit/components/nimbus/lib/NimbusFeatureManifest.inc.h b/toolkit/components/nimbus/lib/NimbusFeatureManifest.inc.h
new file mode 100644
index 0000000000..4d3190635c
--- /dev/null
+++ b/toolkit/components/nimbus/lib/NimbusFeatureManifest.inc.h
@@ -0,0 +1,18 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Maybe<nsCString> GetNimbusFallbackPrefName(const nsACString& aFeatureId,
+                                           const nsACString& aVariable) {
+  nsAutoCString manifestKey;
+  manifestKey.Append(aFeatureId);
+  manifestKey.Append("_");
+  manifestKey.Append(aVariable);
+
+  for (const auto& pair : NIMBUS_FALLBACK_PREFS) {
+    if (pair.first.Equals(manifestKey.get())) {
+      return Some(pair.second);
+    }
+  }
+  return Nothing{};
+}