[Misc] Workaround a regression in Firefox

(cherry picked from commit fa46bfe8)

xwiki-platform-core/xwiki-platform-test/xwiki-platform-test-docker/src/main/java/org/xwiki/test/docker/junit5/browser/Browser.java

@@ -100,6 +100,8 @@ private static FirefoxOptions buildFirefoxOptions()
         }
         // We want to ensure that those events are taking into account.
         options.addPreference("dom.disable_beforeunload", false);
+        // Workaround for https://github.com/mozilla/geckodriver/issues/2212
+        options.addPreference("remote.events.async.enabled", false);
         return options;
     }