I did a little web searching and could not find anything that linked your file and firefox. I think you're getting hit with some malware. Did this alert come up when you went to visit a certain website? You should do a malware check with a few malware scan programs. You need to use all of the programs because each detects different malware. Make sure that you update each program to get the latest version of the database. * [[http://www.malwarebytes.org/mbam.php]] - Malwarebytes' Anti-Malware * [[http://www.superantispyware.com/]] - SuperAntispyware * [[http://www.safer-networking.org/en/index.html]] - Spybot Search & Destroy * [[http://www.lavasoft.com/products/ad_aware_free.php]] - Ad-Aware Free * [[www.microsoft.com/security_essentials/]] - Microsoft security essentials download page See also "Spyware on Windows": [[http://kb.mozillazine.org/Popups_not_blocked and Searches are redirected to another site]]