Mozilla Firefox(3.0.3) User Interface Dispatcher Crash and Remote Denial of Service. Proof of Concept Note: Mozilla 3.0.3 Crashes with unhandled exception in User Interface Dispatcher Events. If a user try to restore session 3.0.3 version it still gives a crash. This POC has been designed with minimum object usage. Mozilla Firefox User Interface Dispatcher Crash DoS Test POC. Aditya K Sood (C) Sec