bp-c86897d6-8845-4f1e-8340-646e61171107 Signature: shutdownhang | mozilla::dom::workers::RuntimeService::Cleanup IseGuard64.dll = Internet Security Essentials = COMODO iimFirefoxConnector.dll = iMacros cmdshim64.dll = possible malware guard64.dll = Internet Security Essentials = COMODO msmpeg2vdec.dll = Microsoft DTV-DVD Video Decoder ---------------- You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.