Sounds like you managed to pickup some Malware. 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/viruses/disinfection/5350 Anti-Rootkit Utility - TDSSKiller] * [http://general-changelog-team.fr/en/downloads/viewdownload/20-outils-de-xplode/2-adwcleaner AdwCleaner] (for more info, see this [http://www.bleepingcomputer.com/download/adwcleaner/ alternate AdwCleaner download page]) * [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. Windows 8 has antivirus [http://www.microsoft.com/security/pc-security/windows8.aspx#antivirus built-in] already. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Did this fix your problems? Please report back to us!

Hi pressero, where does it appear? For example: * It is a page you visited once that you closed but Firefox reopens it (possibly along with other previously closed tabs) * It is a history tile on the new tab page * It appears as a suggestion when you type in the address bar Although you can clear history from Firefox, Firefox doesn't control what is "out there" on various search engines. If this content appears on the results page when you do a new search, you may need to get it removed by whatever site it is on -- search engines usually do not want to remove listings for live pages.