For some versions now, FF hangs when using SmartCard authentication to Federation Service (SAML2.0). Even forced close does not work, need to kill correct process to end FF. SAML Tracer plugin shows GET application GET federation service (SAML) GET auth.federation service (SAML) Footer shows popup "TLS-handshake with auth.federation service" Last tested on 60.0b13 Crypto module is "Broadcom Corp Contacted SmartCard 0", Versions 1.0 manufacturer Athena Smartcard Solutions Tested on clean profile without plugins Federation service is NetIQ Dump created by process explorer 64 Analyzed with MS Debug Diagnostics Tool Detected a serious critical section related problem in firefox.dmp Lock at 0x0000009b`1d2da630 is Uninitialized Impact analysis 1,54% of threads blocked (Threads 6) Thread 6 - System ID 8684 Entry point ntdll!RtlUserThreadStart+34 Create time 18.04.2018 09:41:58 Time spent in user mode 0 Days 00:00:00.015 Time spent in kernel mode 0 Days 00:00:00.140 This thread is not fully resolved and may or may not be a problem. Further analysis of these threads may be required. Function ntdll!NtWaitForSingleObject+a ntdll!RtlpWaitOnCriticalSection+e1 ntdll!RtlpEnterCriticalSectionContended+a4 nss3!PR_Lock+1f nss3!PK11_IsHW+8160 nss3!PK11_IsHW+8fd3 nss3!PK11_IsHW+31da nss3!PK11_IsHW+350b nss3!PK11_IsHW+2fcb nss3!CERT_CertChainFromCert+96 nss3!SSL_SignatureSchemePrefSet+124b nss3!SSL_SignatureSchemePrefSet+330a nss3!SSL_SignatureSchemePrefSet+525c nss3!SSL_SignatureSchemePrefSet+4c53 nss3!SSL_SignatureSchemePrefSet+4a4c nss3!SSL_SignatureSchemePrefSet+5013 nss3!SSL_SignatureSchemePrefSet+58e8 nss3!SSL_SignatureSchemePrefSet+10aa7 nss3!SSL_ForceHandshake+d9 xul!mozilla_dump_image+133bb09 xul!workerlz4_compress+eed0a xul+4ba9c1 xul+97df25 xul+7c3e68 xul+4c24b4 xul+54db56 xul+54e08d xul+63f9f8 xul+76ea16 xul+76e9b5 xul+507317 xul+5072c6 xul+507412 nss3!PRP_TryLock+55e nss3!PR_MD_UNLOCK+1362 ucrtbase!thread_start<unsigned int (__cdecl*)(void * __ptr64)>+35 kernel32!BaseThreadInitThunk+22 ntdll!RtlUserThreadStart+34