2 files changed, 13 insertions, 2 deletions
diff --git a/extensions/url/00_url.js b/extensions/url/00_url.js
index 1c66c9d57..2daae8d45 100644
--- a/extensions/url/00_url.js
+++ b/extensions/url/00_url.js
@@ -524,9 +524,9 @@
       // Union for (sequence<sequence<USVString>> or record<USVString, USVString> or USVString)
       if (webidl.type(V) === "Object" && V !== null) {
         if (V[Symbol.iterator] !== undefined) {
-          return webidl.converters["sequence<sequence<ByteString>>"](V, opts);
+          return webidl.converters["sequence<sequence<USVString>>"](V, opts);
         }
-        return webidl.converters["record<ByteString, ByteString>"](V, opts);
+        return webidl.converters["record<USVString, USVString>"](V, opts);
       }
       return webidl.converters.USVString(V, opts);
     };
diff --git a/extensions/webidl/00_webidl.js b/extensions/webidl/00_webidl.js
index 3e6dc95eb..8260cf214 100644
--- a/extensions/webidl/00_webidl.js
+++ b/extensions/webidl/00_webidl.js
@@ -582,6 +582,17 @@
     converters.ByteString,
   );
 
+  converters["sequence<USVString>"] = createSequenceConverter(
+    converters.USVString,
+  );
+  converters["sequence<sequence<USVString>>"] = createSequenceConverter(
+    converters["sequence<USVString>"],
+  );
+  converters["record<USVString, USVString>"] = createRecordConverter(
+    converters.USVString,
+    converters.USVString,
+  );
+
   converters["sequence<DOMString>"] = createSequenceConverter(
     converters.DOMString,
   );