diff --git a/src/functional_tests/test_room_tray.py b/src/functional_tests/test_room_tray.py
index 2896006..6aeb188 100644
--- a/src/functional_tests/test_room_tray.py
+++ b/src/functional_tests/test_room_tray.py
@@ -249,6 +249,7 @@ class TrayTest(FunctionalTest):
     # Test T8 — portrait: 1 column × 8 rows of square cells              #
     # ------------------------------------------------------------------ #
 
+    @tag('two-browser')
     def test_tray_grid_is_1_column_by_8_rows_in_portrait(self):
         room = self._make_sig_select_room()
         self.create_pre_authenticated_session("founder@test.io")