If you suspect malware issue, Do a malware check with some malware scan programs. You need to scan with all programs because each program detects different malware. Make sure that you update each program to get the latest version of the database before doing a scan.

• http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
• http://www.superantispyware.com/ - SuperAntispyware
• http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
• http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
• http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free

See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and Searches are redirected to another site

Mozilla Firefox is a web browser, not a antivirus scanner.

It sounds like one of those sites where a fake animated scanner comes up (in a Windows theme) and then claim you are infected with something bogus just to get you to download what will really be what infects the Windows computer if run. More obvious it is fake when one gets this on Mac OSX or Linux.

It wasn't a bogus alarm. However, it just detected what had already been detected, and put into a quarantine file/s. I'm good to go.

Thanks for your suggestions!