See the "How do I get rid of malware?" section of the following article.

• Troubleshoot Firefox issues caused by malware

The following article offers tips for solving performance problems in Firefox, but it's unlikely to help if you're having trouble with your entire system.

• Quick fixes if your Firefox slows down

I have to add that I can find no legitimate references to such a virus. ytimg.com stands for YouTube Image. It's a domain owned by Google that hosts thumbnails for YouTube videos, and possibly other content. There are several subdomains, like s.ytimg.com, s2.ytimg.com and s3.ytimg.com.

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:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

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.

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I tried several different spyware removal packagers and they did not make any difference at all. There must be a way of removing this from my computer.

Its already answered

• https://support.mozilla.org/en-US/questions/953550