diff --git a/test/common/webdriver_bidi.py b/test/common/webdriver_bidi.py
index 6ee42045c1dc..40cbf9640b36 100644
--- a/test/common/webdriver_bidi.py
+++ b/test/common/webdriver_bidi.py
@@ -458,6 +458,8 @@ async def start_bidi_session(self) -> None:
         (self.profiledir / "user.js").write_text(f"""
             user_pref("remote.enabled", true);
             user_pref("remote.frames.enabled", true);
+            // https://bugzilla.mozilla.org/show_bug.cgi?id=1947402
+            user_pref('remote.events.async.enabled', false);
             user_pref("app.update.auto", false);
             user_pref("datareporting.policy.dataSubmissionEnabled", false);
             user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);