Virus in Firefox Program?

Anybody heard of a virus in Firefox program? I’m a novice attempting to run virus/malware checks on a relative’s computer. She had numerous viruses. Firefox (she didn’t download) will not delete. I get a message that Avast created a pass for Firefox. Any ideas?

https://forum.avast.com/index.php?board=4.0

Thanks! :wink:

You’re welcome.