[Draft] WIP close prompt on download [skip ci]

manifests/key.yaml

@@ -36,7 +36,11 @@ address_bar_and_search:
       mac: pass
       win: unstable
     splits:
-    - functional1
+     - functional1
+  test_close_browser_when_downloading_private_session:
+    result: pass
+    splits:
+      - functional1
   test_clipboard_pref_flip:
     result: unstable
     splits:

modules/browser_object_navigation.py

@@ -579,6 +579,16 @@ def _download_complete(_):
         self.wait.until(_download_complete)
         return self
 
+    @BasePage.context_chrome
+    def attempt_close_window(self):
+        """
+        Focus the window header/tab strip first, then attempt to close the window.
+        This makes the close prompt deterministic in situations like downloads-in-progress.
+        """
+
+        self.get_element("tab-strip").click()
+        self.get_element("window-close-button").click()
+
     @BasePage.context_chrome
     def refresh_page(self) -> BasePage:
         """