Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. You can try these free programs to scan for malware, which work with your existing antivirus software: * [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] * [http://www.surfright.nl/en/hitmanpro/ Hitman Pro] * [http://www.eset.com/us/online-scanner/ ESET Online Scanner] [http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Did this fix your problems? Please report back to us!

That is a problem with Trusteer software (RapportTanzanxx.DLL). Make sure that you have the latest updates of your Trusteer software.<br /> You can try to contact Trusteer for support. *http://www.trusteer.com/support/rapport-installation-links *http://www.trusteer.com/support/report-problem *http://www.trusteer.com/support/submit-ticket Try to update or uninstall and reinstall Trusteer Rapport and if that doesn't help then disable/stop the program for now. *Start Menu > Programs > Trusteer Rapport > Stop Rapport *http://kb.mozillazine.org/Firefox_crashes#Trusteer_Rapport