Whenever you try to access a file from an unsigned jar file (a perfectly valid thing to do) you end up reporting an error to the js console (nsJAR.cpp line 310): if (!manItem) { => ReportError(aFilename, nsIZipReader::NOT_SIGNED); return NS_OK; } This is erroneous. Furthermore, the code goes on to hit this assertion: NTDLL! 77f7629c() nsDebug::Assertion(const char * 0x100b7cc0, const char * 0x100b7ca8, const char * 0x100b7c6c, int 0x0000001c) line 242 + 13 bytes nsDebug::PreCondition(const char * 0x100b7cc0, const char * 0x100b7ca8, const char * 0x100b7c6c, int 0x0000001c) line 337 + 21 bytes nsConsoleMessage::AddRef(nsConsoleMessage * const 0x031af1a0) line 28 + 35 bytes nsConsoleService::LogMessage(nsConsoleService * const 0x03672280, nsIConsoleMessage * 0x031af1a0) line 108 nsConsoleService::LogStringMessage(nsConsoleService * const 0x03672280, const unsigned short * 0x031ae520) line 173 nsJAR::ReportError(const char * 0x0319cd80, short 0x0000) line 786 nsJAR::GetCertificatePrincipal(nsJAR * const 0x00e9bb70, const char * 0x0319cd80, nsIPrincipal * * 0x0012ef08) line 311 nsJARChannel::GetOwner(nsJARChannel * const 0x0312d080, nsISupports * * 0x0012ef64) line 795 + 57 bytes nsDocument::Reset(nsIChannel * 0x0312d080, nsILoadGroup * 0x02dbbc80) line 856 nsHTMLDocument::Reset(nsIChannel * 0x0312d080, nsILoadGroup * 0x02dbbc80) line 323 + 16 bytes nsDocument::StartDocumentLoad(nsDocument * const 0x031aee60, const char * 0x0035dcac, nsIChannel * 0x0312d080, nsILoadGroup * 0x02dbbc80, nsISupports * 0x02db5cf0, nsIStreamListener * * 0x0012fb64, int 0x00000001) line 880 + 22 bytes nsHTMLDocument::StartDocumentLoad(nsHTMLDocument * const 0x031aee60, const char * 0x0035dcac, nsIChannel * 0x0312d080, nsILoadGroup * 0x02dbbc80, nsISupports * 0x02db5cf0, nsIStreamListener * * 0x0012fb64, int 0x00000001) line 417 + 33 bytes nsLayoutDLF::CreateDocument(const char * 0x0035dcac, nsIChannel * 0x0312d080, nsILoadGroup * 0x02dbbc80, nsISupports * 0x02db5cf0, const nsID & {...}, nsIStreamListener * * 0x0012fb64, nsIContentViewer * * 0x0012fa54) line 408 + 45 bytes nsLayoutDLF::CreateInstance(nsLayoutDLF * const 0x031acfe0, const char * 0x0035dcac, nsIChannel * 0x0312d080, nsILoadGroup * 0x02dbbc80, const char * 0x0012fb24, nsISupports * 0x02db5cf0, nsISupports * 0x00000000, nsIStreamListener * * 0x0012fb64, nsIContentViewer * * 0x0012fa54) line 291 + 37 bytes nsDocShell::NewContentViewerObj(nsDocShell * const 0x02db5cd0, const char * 0x0012fb24, nsIChannel * 0x0312d080, nsILoadGroup * 0x02dbbc80, nsIStreamListener * * 0x0012fb64, nsIContentViewer * * 0x0012fa54) line 2170 + 132 bytes nsDocShell::CreateContentViewer(nsDocShell * const 0x02db5cd0, const char * 0x0012fb24, nsIChannel * 0x0312d080, nsIStreamListener * * 0x0012fb64) line 2114 + 60 bytes nsDSURIContentListener::DoContent(nsDSURIContentListener * const 0x02dbac50, const char * 0x0012fb24, int 0x00000000, const char * 0x10099aa8 gCommonEmptyBuffer, nsIChannel * 0x0312d080, nsIStreamListener * * 0x0012fb64, int * 0x0012fb08) line 100 + 33 bytes nsDocumentOpenInfo::DispatchContent(nsIChannel * 0x0312d080, nsISupports * 0x00000000) line 326 + 109 bytes nsDocumentOpenInfo::OnStartRequest(nsDocumentOpenInfo * const 0x03128580, nsIChannel * 0x0312d080, nsISupports * 0x00000000) line 175 + 16 bytes nsJARChannel::OnStartRequest(nsJARChannel * const 0x0312d084, nsIChannel * 0x0319bb30, nsISupports * 0x00000000) line 859 nsOnStartRequestEvent::HandleEvent(nsOnStartRequestEvent * const 0x031ab7a0) line 212 + 26 bytes nsStreamListenerEvent::HandlePLEvent(PLEvent * 0x031ab690) line 97 + 12 bytes PL_HandleEvent(PLEvent * 0x031ab690) line 575 + 10 bytes PL_ProcessPendingEvents(PLEventQueue * 0x010791a0) line 520 + 9 bytes _md_EventReceiverProc(HWND__ * 0x004603ac, unsigned int 0x0000c0fb, unsigned int 0x00000000, long 0x010791a0) line 1030 + 9 bytes USER32! 77e71820() because nsConsoleMessage is not thread safe and is being called on a file-fetcher thread.

Fix in hand for the incorrect error message in the JS console. Filed bug 40223 re: the threadsafe asserts in nsConsoleMessage. What sort of permission do I need to check this in?

Putting on [nsbeta2+] radar for beta2 fix.

Fix checked in.

Sorry for the spam. New QA Contact for Browser General. Thanks for your help Joseph (good luck with the new job) and welcome aboard Doron Rosenberg

verified with 071708 mozilla build on NT.