diff --git a/packages/mui-base/src/Select/OptionIndicator/SelectOptionIndicator.test.tsx b/packages/mui-base/src/Select/OptionIndicator/SelectOptionIndicator.test.tsx
index 7f410cc70..13375ae02 100644
--- a/packages/mui-base/src/Select/OptionIndicator/SelectOptionIndicator.test.tsx
+++ b/packages/mui-base/src/Select/OptionIndicator/SelectOptionIndicator.test.tsx
@@ -1,28 +1,32 @@
-// import * as React from 'react';
-// import { Select } from '@base_ui/react/Select';
-// import { createRenderer, describeConformance } from '#test-utils';
-// import { SelectOptionContext } from '../Option/SelectOptionContext';
+import * as React from 'react';
+import { Select } from '@base_ui/react/Select';
+import { createRenderer, describeConformance } from '#test-utils';
+import { SelectOptionContext } from '../Option/SelectOptionContext';
 
-// const selectItemContextValue = {
-//   open: true,
-//   selected: true,
-// };
+const selectItemContextValue = {
+  open: true,
+  selected: true,
+};
 
-// describe('<Select.OptionIndicator />', () => {
-//   const { render } = createRenderer();
+describe('<Select.OptionIndicator />', () => {
+  const { render } = createRenderer();
 
-//   describeConformance(<Select.OptionIndicator />, () => ({
-//     refInstanceof: window.HTMLSpanElement,
-//     render(node) {
-//       return render(
-//         <Select.Root open animated={false}>
-//           <Select.Positioner>
-//             <SelectOptionContext.Provider value={selectItemContextValue}>
-//               {node}
-//             </SelectOptionContext.Provider>
-//           </Select.Positioner>
-//         </Select.Root>,
-//       );
-//     },
-//   }));
-// });
+  if (/firefox/i.test(navigator.userAgent)) {
+    return;
+  }
+
+  describeConformance(<Select.OptionIndicator />, () => ({
+    refInstanceof: window.HTMLSpanElement,
+    render(node) {
+      return render(
+        <Select.Root open animated={false}>
+          <Select.Positioner>
+            <SelectOptionContext.Provider value={selectItemContextValue}>
+              {node}
+            </SelectOptionContext.Provider>
+          </Select.Positioner>
+        </Select.Root>,
+      );
+    },
+  }));
+});