Hello, Please see the article below for instructions to reset Firefox. [[Reset Firefox – easily fix most problems]] But what problems are you having specifically? Resetting Firefox won't necessarily fix a problem caused by a virus because until you remove the virus it will be able to make changes to your Firefox settings again. 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] Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Also I notice that you are using Firefox v24. To get the latest security fixes you should update to the latest version (25): [[Update Firefox to the latest version]] Please let me know if this fixes your issue. Did this fix your problems? Please report back to us!