Stablize test form autofill

Author: whlpatricia

tests/form_autofill/test_form_autofill_suggestions.py

@@ -40,6 +40,7 @@ def test_form_autofill_suggestions(
 
     # verify form data in reverse (newer options are at the top)
     for idx in range(1, 3):
+        autofill_popup.ensure_autofill_dropdown_visible()
         autofill_popup.select_nth_element(idx)
         credit_card_autofill.verify_form_data(sample_data[idx - 1])
         credit_card_autofill.click_on("form-field", labels=["cc-name"])