Thread 3 Crashed:
0   com.apple.WebCore             	0x03d4d0d7 WTF::RefCountedBase::derefBase() + 71 (RefCounted.h:67)
1   com.apple.WebCore             	0x03e61409 WTF::RefCounted<WebCore::DOMWrapperWorld>::deref() + 17 (RefCounted.h:108)
2   com.apple.WebCore             	0x03e6144b WTF::RefPtr<WebCore::DOMWrapperWorld>::~RefPtr() + 31
3   com.apple.WebCore             	0x04194fa5 WebCore::JSEventListener::~JSEventListener() + 41
4   com.apple.WebCore             	0x03e2093f WTF::RefCounted<WebCore::EventListener>::deref() + 53 (RefCounted.h:109)
5   com.apple.WebCore             	0x03e9297c WTF::RefPtr<WebCore::EventListener>::~RefPtr() + 34
6   com.apple.WebCore             	0x03f20abd WebCore::RegisteredEventListener::~RegisteredEventListener() + 17
7   com.apple.WebCore             	0x03f20ad9 WTF::VectorDestructor<true, WebCore::RegisteredEventListener>::destruct(WebCore::RegisteredEventListener*, WebCore::RegisteredEventListener*) + 25 (Vector.h:87)
8   com.apple.WebCore             	0x03f20b00 WTF::VectorTypeOperations<WebCore::RegisteredEventListener>::destruct(WebCore::RegisteredEventListener*, WebCore::RegisteredEventListener*) + 24 (Vector.h:243)
9   com.apple.WebCore             	0x03f20c5b WTF::Vector<WebCore::RegisteredEventListener, 1ul>::shrink(unsigned long) + 131 (Vector.h:769)
10  com.apple.WebCore             	0x03f2236e WTF::Vector<WebCore::RegisteredEventListener, 1ul>::~Vector() + 34
11  com.apple.WebCore             	0x03f223d2 void WTF::deleteAllPairSeconds<WTF::Vector<WebCore::RegisteredEventListener, 1ul>*, WTF::HashMap<WebCore::AtomicString, WTF::Vector<WebCore::RegisteredEventListener, 1ul>*, WebCore::AtomicStringHash, WTF::HashTraits<WebCore::AtomicString>, WTF::HashTraits<WTF::Vector<WebCore::RegisteredEventListener, 1ul>*> > const>(WTF::HashMap<WebCore::AtomicString, WTF::Vector<WebCore::RegisteredEventListener, 1ul>*, WebCore::AtomicStringHash, WTF::HashTraits<WebCore::AtomicString>, WTF::HashTraits<WTF::Vector<WebCore::RegisteredEventListener, 1ul>*> > const&) + 84 (HashMap.h:353)
12  com.apple.WebCore             	0x03f22427 void WTF::deleteAllValues<WebCore::AtomicString, WTF::Vector<WebCore::RegisteredEventListener, 1ul>*, WebCore::AtomicStringHash, WTF::HashTraits<WebCore::AtomicString>, WTF::HashTraits<WTF::Vector<WebCore::RegisteredEventListener, 1ul>*> >(WTF::HashMap<WebCore::AtomicString, WTF::Vector<WebCore::RegisteredEventListener, 1ul>*, WebCore::AtomicStringHash, WTF::HashTraits<WebCore::AtomicString>, WTF::HashTraits<WTF::Vector<WebCore::RegisteredEventListener, 1ul>*> > const&) + 17 (HashMap.h:359)
13  com.apple.WebCore             	0x03f20018 WebCore::EventTargetData::~EventTargetData() + 20
14  com.apple.WebCore             	0x04763858 WebCore::WorkerContext::~WorkerContext() + 190
15  com.apple.WebCore             	0x045dc84a WebCore::SharedWorkerContext::~SharedWorkerContext() + 72
16  com.apple.WebCore             	0x03e1a321 WTF::RefCounted<WebCore::WorkerContext>::deref() + 59 (RefCounted.h:109)
17  com.apple.WebCore             	0x0476cd24 WTF::RefPtr<WebCore::WorkerContext>::operator=(WebCore::WorkerContext*) + 66 (RefPtr.h:133)
18  com.apple.WebCore             	0x0476c883 WebCore::WorkerThread::workerThread() + 513 (WorkerThread.cpp:146)
19  com.apple.WebCore             	0x0476c8ad WebCore::WorkerThread::workerThreadStart(void*) + 17 (WorkerThread.cpp:113)
20  com.apple.JavaScriptCore      	0x006b6ba2 __ZN3WTFL16threadEntryPointEPv + 120 (Threading.cpp:66)
21  libSystem.B.dylib             	0x935c1155 _pthread_start + 321
22  libSystem.B.dylib             	0x935c1012 thread_start + 34