diff --git a/tools/wptrunner/wptrunner/executors/executormarionette.py b/tools/wptrunner/wptrunner/executors/executormarionette.py
index fe1fed136309ba..c1748f1ffda53e 100644
--- a/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -275,15 +275,18 @@ def get_test_window(self, window_id, parent, timeout=5):
     def test_window_loaded(self):
         """Wait until the page in the new window has been loaded.
 
-        Hereby ignore Javascript execptions that are thrown when
+        Hereby ignore Javascript exceptions that are thrown when
         the document has been unloaded due to a process change.
         """
         while True:
             try:
                 self.parent.base.execute_script(self.window_loaded_script, asynchronous=True)
                 break
-            except errors.JavascriptException:
-                pass
+            except errors.JavascriptException as e:
+                if e.message.startswith("Script evaluation aborted: Actor"):
+                    # Special-case JavaScript errors for a JSWindowActor destroy
+                    # until a decision is made on bug 1673478.
+                    pass
 
 
 class MarionettePrefsProtocolPart(PrefsProtocolPart):