diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_window_rect.py b/testing/marionette/harness/marionette_harness/tests/unit/test_window_rect.py
index 844b9ec14a5f..e51cc9835635 100644
--- a/testing/marionette/harness/marionette_harness/tests/unit/test_window_rect.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_window_rect.py
@@ -4,8 +4,11 @@
 
 from __future__ import absolute_import, print_function
 
+import sys
+
 from marionette_driver.errors import InvalidArgumentException
 from marionette_harness import MarionetteTestCase
+from unittest import skipIf
 
 
 class TestWindowRect(MarionetteTestCase):
@@ -299,6 +302,17 @@ class TestWindowRect(MarionetteTestCase):
         self.assertEqual(result_size["width"], expected_size["width"])
         self.assertEqual(result_size["height"], expected_size["height"])
 
+    # marionette attempts to exit fullscreen before minimizing the window.
+    # To do this, it waits on a sizemode event, but that event is sent at
+    # the beginning of the fullscreen transition. For macOS native
+    # fullscreen, it's rejected to try to minimize the window during the
+    # transition, and there is *no* event sent at the end of transition.
+    # This puts marionette in an impossible position. So for now, we
+    # skip this test on macOS. Bug 1802192.
+    @skipIf(
+        sys.platform.startswith("darwin"),
+        "Bug 1802192 - macOS fullscreen windows can't be resized.",
+    )
     def test_resize_while_fullscreen(self):
         self.marionette.fullscreen()
         expected_size = self.marionette.set_window_rect(
diff --git a/testing/web-platform/meta/webdriver/tests/minimize_window/minimize.py.ini b/testing/web-platform/meta/webdriver/tests/minimize_window/minimize.py.ini
index 282a56555da9..49ad17781517 100644
--- a/testing/web-platform/meta/webdriver/tests/minimize_window/minimize.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/minimize_window/minimize.py.ini
@@ -4,3 +4,7 @@
   [test_no_top_browsing_context]
     expected:
       if (os == "linux") and fission and not debug: [PASS, ERROR]
+  [test_fully_exit_fullscreen]
+    bug: 1802192
+    expected:
+      if os == "mac": FAIL
diff --git a/testing/web-platform/meta/webdriver/tests/set_window_rect/set.py.ini b/testing/web-platform/meta/webdriver/tests/set_window_rect/set.py.ini
index 14b69901ee42..637103fbe7fa 100644
--- a/testing/web-platform/meta/webdriver/tests/set_window_rect/set.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/set_window_rect/set.py.ini
@@ -14,3 +14,8 @@
   [test_y_as_current]
     expected:
       if not fission and not swgl and not debug: [PASS, FAIL]
+
+  [test_fully_exit_fullscreen]
+    bug: 1802192
+    expected:
+      if os == "mac": FAIL